:root {
  --bg-1: #17d7c8;
  --bg-2: #6ee7a7;
  --bg-3: #ffd166;
  --bg-4: #ff7b7b;
  --bg-5: #f72585;
  --bg-6: #8b5cf6;
  --bg-7: #3158ff;
  --bg-8: #0ea5e9;
  --accent-1: #22d3ee;
  --accent-2: #f72585;
  --accent-3: #ffd166;
  --accent-teal: #14b8a6;
  --accent-soft-blue: #e0f2fe;
  --accent-light-cyan: #cffafe;
  --surface: rgba(255, 255, 255, 0.86);
  --text: #0a1929;
  --muted: #3d5468;
  --stroke: rgba(255, 255, 255, 0.58);
  --primary: #4f46e5;
  --primary-strong: #3730a3;
  --accent: #f72585;
  --accent-soft: #fff0f7;
  --ok: #22a75a;
  --warn: #d4941e;
  --locked: #5f7a92;
  --shadow: 0 24px 70px rgba(39, 47, 106, 0.20);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  position: relative;
  isolation: isolate;
  overflow-x: hidden;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 10%, rgba(23, 215, 200, 0.95) 0%, transparent 34%),
    radial-gradient(circle at 18% 88%, rgba(255, 209, 102, 0.92) 0%, transparent 32%),
    radial-gradient(circle at 53% 72%, rgba(255, 123, 123, 0.86) 0%, transparent 34%),
    radial-gradient(circle at 78% 72%, rgba(247, 37, 133, 0.96) 0%, transparent 38%),
    radial-gradient(circle at 82% 14%, rgba(139, 92, 246, 0.9) 0%, transparent 40%),
    radial-gradient(circle at 98% 0%, rgba(49, 88, 255, 0.85) 0%, transparent 35%),
    linear-gradient(135deg, var(--bg-1) 0%, var(--bg-2) 18%, var(--bg-3) 34%, var(--bg-4) 50%, var(--bg-5) 68%, var(--bg-6) 84%, var(--bg-7) 100%);
  background-attachment: fixed;
  background-size: 180% 180%, 170% 170%, 190% 190%, 180% 180%, 170% 170%, 160% 160%, 240% 240%;
  animation: auroraShift 14s ease-in-out infinite alternate;
}

body::before {
  content: "";
  position: fixed;
  inset: -20%;
  z-index: -2;
  pointer-events: none;
  background:
    conic-gradient(from 180deg at 50% 50%, rgba(34, 211, 238, 0.32), rgba(247, 37, 133, 0.28), rgba(255, 209, 102, 0.24), rgba(79, 70, 229, 0.26), rgba(34, 211, 238, 0.32));
  filter: blur(70px) saturate(1.18);
  opacity: 0.82;
  animation: auroraSpin 28s linear infinite;
}

body::after {
  content: "";
  position: fixed;
  inset: -15%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 18% 28%, rgba(255, 255, 255, 0.28) 0 7%, transparent 24%),
    radial-gradient(circle at 72% 22%, rgba(34, 211, 238, 0.34) 0 9%, transparent 28%),
    radial-gradient(circle at 74% 78%, rgba(255, 209, 102, 0.32) 0 10%, transparent 30%),
    radial-gradient(circle at 34% 76%, rgba(247, 37, 133, 0.3) 0 8%, transparent 28%);
  filter: blur(24px);
  animation: colorClouds 16s ease-in-out infinite alternate;
}

@keyframes auroraShift {
  0% { background-position: 0% 0%, 15% 85%, 50% 75%, 80% 68%, 88% 12%, 100% 0%, 0% 50%; }
  50% { background-position: 18% 10%, 0% 70%, 42% 88%, 65% 82%, 72% 18%, 90% 8%, 70% 35%; }
  100% { background-position: 6% 18%, 24% 78%, 60% 62%, 90% 74%, 95% 26%, 78% 0%, 100% 50%; }
}

@keyframes auroraSpin {
  from { transform: rotate(0deg) scale(1); }
  to { transform: rotate(360deg) scale(1.08); }
}

@keyframes colorClouds {
  0% { transform: translate3d(-4%, -3%, 0) rotate(-4deg) scale(1); }
  50% { transform: translate3d(5%, 4%, 0) rotate(3deg) scale(1.08); }
  100% { transform: translate3d(-1%, 7%, 0) rotate(7deg) scale(1.03); }
}

.bg-orb {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 999px;
  z-index: -1;
  filter: blur(60px);
  opacity: 0.7;
  animation: orbFloat 12s ease-in-out infinite;
}

.bg-orb-a {
  top: -200px;
  left: -150px;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.62), rgba(255, 209, 102, 0.32), transparent 70%);
  animation-delay: 0s;
}

.bg-orb-b {
  bottom: -200px;
  right: -150px;
  background: radial-gradient(circle, rgba(247, 37, 133, 0.58), rgba(79, 70, 229, 0.32), transparent 70%);
  animation-delay: -20s;
}

@keyframes orbFloat {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  35% { transform: translate3d(90px, 45px, 0) scale(1.16); }
  70% { transform: translate3d(-35px, -70px, 0) scale(0.94); }
  100% { transform: translate3d(0, 0, 0) scale(1); }
}

/* Phone/tablet lesson gate. Kept in real HTML/CSS so it remains accessible and maintainable. */
.mobile-lesson-blocker {
  display: none;
}

html.mobile-lesson-blocked,
html.mobile-lesson-blocked body {
  min-height: 100%;
  background: #070b14;
  background-attachment: scroll;
  animation: none;
}

html.mobile-lesson-blocked body {
  overflow-x: hidden;
}

html.mobile-lesson-blocked body::before {
  inset: -10%;
  opacity: 1;
  filter: blur(70px);
  background:
    radial-gradient(circle at 12% 12%, rgba(34, 211, 238, 0.2), transparent 28%),
    radial-gradient(circle at 90% 24%, rgba(79, 70, 229, 0.28), transparent 30%),
    radial-gradient(circle at 45% 95%, rgba(247, 37, 133, 0.16), transparent 30%);
  animation: none;
}

html.mobile-lesson-blocked body::after {
  inset: 0;
  opacity: 0.3;
  filter: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.055) 1px, transparent 1px);
  background-size: 28px 28px;
  animation: none;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}

html.mobile-lesson-blocked body > :not(.mobile-lesson-blocker) {
  display: none !important;
}

html.mobile-lesson-blocked .mobile-lesson-blocker {
  position: relative;
  z-index: 1;
  display: block;
  min-height: 100svh;
  width: 100%;
  padding: clamp(1rem, 4vw, 2.2rem);
  color: #e5edf8;
}

.mobile-block-shell {
  width: min(940px, 100%);
  margin: 0 auto;
}

.mobile-block-brand {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.mobile-block-brand a {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.mobile-block-brand a > span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(103, 232, 249, 0.35);
  border-radius: 12px;
  color: #06131e;
  background: linear-gradient(135deg, #67e8f9, #60a5fa);
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.18);
  font: 800 1.25rem/1 "Chakra Petch", sans-serif;
}

.mobile-block-brand div {
  display: grid;
}

.mobile-block-brand small {
  color: #64748b;
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.mobile-block-brand strong {
  font: 700 1rem/1.2 "Chakra Petch", sans-serif;
}

.mobile-block-status {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(110, 231, 183, 0.18);
  border-radius: 999px;
  color: #9fb1c8;
  background: rgba(15, 23, 42, 0.7);
  font-size: 0.67rem;
  font-weight: 700;
}

.mobile-block-status i {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.1);
}

.mobile-block-card {
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 26px;
  background: linear-gradient(145deg, rgba(17, 24, 39, 0.96), rgba(10, 16, 29, 0.98));
  box-shadow: 0 35px 90px rgba(0, 0, 0, 0.36), inset 0 1px rgba(255, 255, 255, 0.04);
}

.mobile-device-visual {
  position: relative;
  min-height: 240px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  background:
    radial-gradient(circle at 50% 50%, rgba(34, 211, 238, 0.15), transparent 36%),
    linear-gradient(145deg, rgba(17, 32, 53, 0.88), rgba(16, 24, 40, 0.4));
}

.mobile-device-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image: radial-gradient(rgba(148, 163, 184, 0.7) 0.8px, transparent 0.8px);
  background-size: 15px 15px;
  mask-image: radial-gradient(circle, black, transparent 72%);
}

.mobile-desktop-device {
  position: relative;
  z-index: 2;
  width: min(290px, 70vw);
  border: 5px solid #263449;
  border-bottom-width: 9px;
  border-radius: 12px;
  background: #09111f;
  box-shadow: 0 24px 42px rgba(0, 0, 0, 0.42), 0 0 45px rgba(34, 211, 238, 0.08);
  transform: translateX(-7px);
}

.mobile-desktop-bar {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  height: 24px;
  padding: 0 0.5rem;
  border-bottom: 1px solid #263449;
  background: #172235;
}

.mobile-desktop-bar i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #fb7185;
}
.mobile-desktop-bar i:nth-child(2) { background: #fbbf24; }
.mobile-desktop-bar i:nth-child(3) { background: #34d399; }
.mobile-desktop-bar span { margin-left: auto; color: #64748b; font-size: 0.46rem; }

.mobile-desktop-terminal {
  min-height: 120px;
  padding: 0.8rem;
  color: #94a3b8;
  font: 500 0.55rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.mobile-desktop-terminal p { margin: 0 0 0.55rem; }
.mobile-desktop-terminal b { color: #67e8f9; }
.mobile-desktop-terminal .mobile-terminal-ready { margin-top: 1.6rem; color: #6ee7b7; font-weight: 800; }

.mobile-desktop-stand {
  position: absolute;
  left: 50%;
  bottom: -25px;
  width: 54px;
  height: 21px;
  border-bottom: 5px solid #334155;
  transform: translateX(-50%);
}
.mobile-desktop-stand::before { content: ""; position: absolute; left: 23px; width: 8px; height: 20px; background: #334155; }

.mobile-phone-device {
  position: absolute;
  z-index: 3;
  right: max(8%, calc(50% - 185px));
  bottom: 30px;
  width: 62px;
  height: 108px;
  display: grid;
  place-items: center;
  border: 4px solid #475569;
  border-radius: 15px;
  color: #64748b;
  background: #111827;
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
  font: 700 0.65rem/1 "Chakra Petch", sans-serif;
}
.mobile-phone-device > span { position: absolute; top: 5px; width: 18px; height: 3px; border-radius: 4px; background: #475569; }
.mobile-phone-device i { position: absolute; right: -10px; bottom: -8px; width: 28px; height: 28px; display: grid; place-items: center; border: 2px solid #fecdd3; border-radius: 50%; color: #fff; background: #e11d48; box-shadow: 0 8px 20px rgba(225, 29, 72, 0.35); font: 800 1rem/1 sans-serif; }

.mobile-vm-chip {
  position: absolute;
  z-index: 3;
  left: max(5%, calc(50% - 205px));
  top: 30px;
  display: grid;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(103, 232, 249, 0.2);
  border-radius: 10px;
  background: rgba(8, 18, 32, 0.86);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.25);
}
.mobile-vm-chip strong { color: #67e8f9; font: 700 0.68rem/1 "Chakra Petch", sans-serif; }
.mobile-vm-chip span { margin-top: 0.2rem; color: #64748b; font-size: 0.52rem; }

.mobile-block-copy {
  padding: clamp(1.3rem, 5vw, 2.4rem);
}

.mobile-block-kicker {
  margin: 0 0 0.7rem;
  color: #67e8f9;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.mobile-block-copy h1 {
  max-width: 680px;
  color: #f8fafc;
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1;
  letter-spacing: -0.035em;
}

.mobile-block-lead {
  max-width: 720px;
  margin: 1rem 0 0;
  color: #9fb1c8;
  font-size: 0.92rem;
  line-height: 1.7;
}

.mobile-requirements {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
  margin-top: 1.35rem;
}

.mobile-requirements > div {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 0.55rem;
  padding: 0.75rem;
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 12px;
  background: rgba(30, 41, 59, 0.42);
}
.mobile-requirements > div > span { grid-row: 1 / 3; width: 29px; height: 29px; display: grid; place-items: center; border-radius: 8px; color: #67e8f9; background: rgba(34, 211, 238, 0.09); }
.mobile-requirements strong { color: #e2e8f0; font-size: 0.72rem; }
.mobile-requirements small { margin-top: 0.15rem; color: #64748b; font-size: 0.58rem; }

.mobile-block-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  margin-top: 1rem;
  padding: 0.85rem;
  border: 1px solid rgba(96, 165, 250, 0.14);
  border-radius: 12px;
  background: rgba(30, 64, 175, 0.08);
}
.mobile-block-note > span { width: 23px; height: 23px; display: grid; place-items: center; border: 1px solid rgba(96, 165, 250, 0.3); border-radius: 50%; color: #93c5fd; font: 800 0.7rem/1 serif; }
.mobile-block-note p { margin: 0; color: #8fa3bb; font-size: 0.7rem; line-height: 1.55; }
.mobile-block-note strong { color: #bfdbfe; }

.mobile-block-actions {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.65rem;
  margin-top: 1.2rem;
}
.mobile-copy-button,
.mobile-home-link {
  min-height: 46px;
  display: grid;
  place-items: center;
  padding: 0.7rem 1rem;
  border-radius: 11px;
  font: 800 0.76rem/1 "Manrope", sans-serif;
  text-decoration: none;
}
.mobile-copy-button { border: 0; cursor: pointer; color: #04121c; background: linear-gradient(135deg, #67e8f9, #60a5fa); box-shadow: 0 12px 28px rgba(34, 211, 238, 0.16); }
.mobile-home-link { border: 1px solid rgba(148, 163, 184, 0.2); color: #cbd5e1; background: rgba(30, 41, 59, 0.5); }
.mobile-copy-button:focus-visible,
.mobile-home-link:focus-visible { outline: 2px solid #67e8f9; outline-offset: 3px; }
.mobile-copy-status { min-height: 1em; margin: 0.5rem 0 0; color: #64748b; font-size: 0.63rem; text-align: center; }

.mobile-block-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
  padding: 1rem 0 0;
  color: #526176;
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.mobile-block-footer i { width: 3px; height: 3px; border-radius: 50%; background: #334155; }

@media (min-width: 720px) and (max-width: 1100px) and (pointer: coarse) {
  .mobile-block-card {
    display: grid;
    grid-template-columns: minmax(280px, 0.8fr) 1.2fr;
    align-items: stretch;
  }

  .mobile-device-visual {
    min-height: 100%;
    border-right: 1px solid rgba(148, 163, 184, 0.12);
    border-bottom: 0;
  }
}

@media (max-width: 520px) {
  html.mobile-lesson-blocked .mobile-lesson-blocker {
    padding: 0.8rem;
  }

  .mobile-block-brand {
    margin: 0.15rem 0 0.8rem;
  }

  .mobile-block-status {
    padding: 0.4rem;
    font-size: 0;
  }

  .mobile-block-status i {
    margin: 0.05rem;
  }

  .mobile-block-card {
    border-radius: 20px;
  }

  .mobile-device-visual {
    min-height: 205px;
  }

  .mobile-desktop-device {
    width: min(255px, 73vw);
  }

  .mobile-desktop-terminal {
    min-height: 105px;
  }

  .mobile-vm-chip {
    top: 18px;
    left: 12px;
  }

  .mobile-phone-device {
    right: 14px;
    bottom: 22px;
    transform: scale(0.88);
  }

  .mobile-block-copy {
    padding: 1.25rem;
  }

  .mobile-block-copy h1 {
    font-size: clamp(2rem, 10vw, 2.6rem);
  }

  .mobile-requirements {
    grid-template-columns: 1fr;
  }

  .mobile-requirements > div {
    padding: 0.62rem 0.7rem;
  }

  .mobile-block-actions {
    grid-template-columns: 1fr;
  }

  .mobile-block-footer {
    flex-wrap: wrap;
  }
}

.container {
  width: min(1240px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0.7rem;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.7rem;
  padding: 0.85rem 1rem;
  gap: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 14px 40px rgba(31, 38, 89, 0.12);
  backdrop-filter: blur(20px) saturate(1.2);
}

.brand-tag {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.17em;
  color: var(--muted);
  text-transform: uppercase;
}

.brand-home-link {
  color: inherit;
  text-decoration: none;
}

.brand-home-link:hover,
.brand-home-link:focus-visible {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.18em;
}

.brand-home-link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 0.2em;
  border-radius: 0.2em;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: "Chakra Petch", sans-serif;
  line-height: 1.1;
}

h1 {
  font-size: clamp(1.5rem, 2.7vw, 2.2rem);
}

h2 {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
}

.topbar-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.btn {
  border: none;
  cursor: pointer;
  font-weight: 700;
  border-radius: 12px;
  padding: 0.65rem 1rem;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #2470d0);
  color: white;
  box-shadow: 0 12px 30px rgba(30, 94, 184, 0.40);
}

.btn-ghost {
  background: white;
  border: 1px solid var(--stroke);
  color: var(--text);
}

.btn-danger {
  background: #e74444;
  color: #fff;
  box-shadow: 0 10px 24px rgba(180, 35, 35, 0.35);
}

.btn-small {
  padding: 0.45rem 0.7rem;
  border-radius: 10px;
  font-size: 0.82rem;
}

.auth-panel {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.auth-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(7, 12, 28, 0.46);
  backdrop-filter: blur(8px);
}

.auth-card {
  position: relative;
  overflow: hidden;
  width: min(440px, 100%);
  padding: 1.45rem;
  border-color: rgba(255, 255, 255, 0.82);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 32px 90px rgba(7, 12, 28, 0.36);
  animation: authCardIn 220ms ease-out both;
}

.auth-glow {
  position: absolute;
  width: 260px;
  height: 260px;
  top: -170px;
  right: -100px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.72), rgba(247, 37, 133, 0.68));
  filter: blur(14px);
  opacity: 0.58;
  pointer-events: none;
}

.auth-mark {
  position: relative;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 0.75rem;
  border-radius: 15px;
  font-family: "Chakra Petch", sans-serif;
  font-size: 1.45rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 12px 28px rgba(79, 70, 229, 0.28);
}

@keyframes authCardIn {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-close {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--muted);
  z-index: 2;
}

.auth-form {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.auth-form label {
  display: grid;
  gap: 0.3rem;
  color: #173651;
  font-weight: 800;
  font-size: 0.9rem;
}

.auth-form label small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  line-height: 1.35;
}

.auth-form input {
  width: 100%;
  border: 1px solid #cbdff2;
  border-radius: 12px;
  padding: 0.78rem 0.85rem;
  font: inherit;
  background: #fff;
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.auth-form input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.13);
  transform: translateY(-1px);
}

.auth-status {
  min-height: 1.2em;
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.auth-switch {
  margin-top: 0.9rem;
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.auth-switch button {
  border: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font-weight: 900;
}

.lesson-confirm-card {
  width: min(500px, 100%);
}

.lesson-confirm-glow {
  background: linear-gradient(135deg, rgba(255, 174, 66, 0.78), rgba(247, 37, 133, 0.62));
}

.lesson-confirm-mark {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  box-shadow: 0 12px 28px rgba(239, 68, 68, 0.25);
}

.lesson-confirm-warning {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1rem;
  padding: 0.85rem;
  border: 1px solid #fed7aa;
  border-radius: 14px;
  background: linear-gradient(135deg, #fff7ed, #fffaf5);
  color: #8a3d0a;
}

.lesson-confirm-warning > span {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #ffedd5;
  color: #ea580c;
  font-size: 1.25rem;
  font-weight: 900;
}

.lesson-confirm-warning p {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.45;
}

.lesson-confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  margin-top: 1.1rem;
  flex-wrap: wrap;
}

.lesson-confirm-submit {
  border: 1px solid #fdba74;
  background: #fff7ed;
  color: #c2410c;
}

.lesson-confirm-submit:hover {
  background: #ffedd5;
}

.lesson-auth-actions {
  padding: 0.2rem 1.1rem 1.1rem;
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.card {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(1.12);
}

.hero {
  margin-top: 1rem;
  padding: 1.5rem;
  display: grid;
  gap: 1.2rem;
  grid-template-columns: 1.35fr 1fr;
}

.eyebrow {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 800;
}

.hero h2 {
  margin-top: 0.5rem;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
}

.hero p {
  color: var(--muted);
  max-width: 62ch;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.hero-badges span {
  background: #f3f8fc;
  border: 1px solid #d5e7f4;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.hero-side {
  display: grid;
  gap: 0.65rem;
}

/* Public landing page */
.guest-landing {
  display: grid;
  gap: 1.1rem;
}

.landing-hero {
  min-height: 510px;
  align-items: center;
  padding: clamp(1.5rem, 4vw, 3.4rem);
  gap: clamp(2rem, 5vw, 4.5rem);
  overflow: hidden;
  background:
    radial-gradient(circle at 92% 15%, rgba(34, 211, 238, 0.2), transparent 35%),
    radial-gradient(circle at 8% 90%, rgba(247, 37, 133, 0.1), transparent 35%),
    rgba(255, 255, 255, 0.92);
}

.status-dot {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  margin-right: 0.35rem;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 5px rgba(16, 185, 129, 0.14);
  vertical-align: 0.05rem;
}

.landing-hero h2 {
  max-width: 720px;
  font-size: clamp(2.15rem, 5vw, 4rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
}

.hero-lead {
  margin: 1.2rem 0 0;
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 0.7rem;
  margin: 1.55rem 0 1.2rem;
  flex-wrap: wrap;
}

.landing-cta {
  min-height: 46px;
  padding-inline: 1.35rem;
  font-size: 0.96rem;
}

.hero-lab {
  position: relative;
  min-width: 0;
  padding: 1.6rem 0.7rem;
}

.lab-window {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 18px;
  color: #dbeafe;
  background: #09111f;
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.3), 0 0 0 8px rgba(255, 255, 255, 0.45);
  transform: perspective(900px) rotateY(-3deg) rotateX(1deg);
}

.lab-window-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.14);
  color: #94a3b8;
  background: #111c2d;
  font: 600 0.68rem/1 "Manrope", sans-serif;
}

.window-dots {
  display: flex;
  gap: 0.3rem;
}

.window-dots i {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #fb7185;
}

.window-dots i:nth-child(2) { background: #fbbf24; }
.window-dots i:nth-child(3) { background: #34d399; }

.lab-secure {
  justify-self: end;
  color: #6ee7b7;
  letter-spacing: 0.08em;
}

.lab-terminal {
  min-height: 220px;
  padding: 1.35rem;
  font: 500 0.86rem/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background:
    linear-gradient(rgba(9, 17, 31, 0.94), rgba(9, 17, 31, 0.94)),
    repeating-linear-gradient(0deg, transparent 0 24px, rgba(34, 211, 238, 0.05) 25px);
}

.lab-terminal p {
  margin: 0 0 0.8rem;
  color: #cbd5e1;
}

.terminal-prompt { color: #67e8f9; }
.lab-terminal .terminal-output { color: #94a3b8; }
.lab-terminal .terminal-success { color: #6ee7b7; font-weight: 700; }

.terminal-cursor {
  display: inline-block;
  width: 0.55rem;
  height: 1rem;
  margin-left: 0.35rem;
  background: #67e8f9;
  vertical-align: -0.15rem;
  animation: terminalBlink 1s step-end infinite;
}

@keyframes terminalBlink { 50% { opacity: 0; } }

.lab-progress {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  color: #94a3b8;
  font-size: 0.72rem;
  background: #111c2d;
}

.lab-progress strong { color: #fff; }
.lab-progress div {
  grid-column: 1 / -1;
  overflow: hidden;
  height: 5px;
  border-radius: 10px;
  background: #263449;
}
.lab-progress div i {
  display: block;
  width: 60%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #22d3ee, #8b5cf6, #f72585);
}

.floating-proof {
  position: absolute;
  z-index: 3;
  display: grid;
  min-width: 120px;
  padding: 0.75rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 15px 35px rgba(15, 23, 42, 0.16);
  backdrop-filter: blur(10px);
}
.floating-proof strong { font-family: "Chakra Petch", sans-serif; font-size: 0.9rem; }
.floating-proof span { color: var(--muted); font-size: 0.67rem; }
.proof-vm { left: -1.4rem; bottom: 0.3rem; }
.proof-safe { right: -1rem; top: 0; }

.landing-trust {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.42);
  box-shadow: 0 14px 35px rgba(31, 38, 89, 0.1);
  backdrop-filter: blur(18px);
}

.landing-trust div {
  display: grid;
  padding: 1.15rem 1.3rem;
  background: rgba(255, 255, 255, 0.76);
}
.landing-trust strong { font: 800 1.45rem/1 "Chakra Petch", sans-serif; color: var(--primary-strong); }
.landing-trust span { margin-top: 0.3rem; color: var(--muted); font-size: 0.78rem; }

.landing-section { margin-top: 1.4rem; }
.landing-heading { max-width: 700px; margin: 0 auto 1.3rem; text-align: center; }
.landing-heading-left { margin-inline: 0; text-align: left; }
.landing-heading h2 { margin-top: 0.45rem; font-size: clamp(1.65rem, 3vw, 2.35rem); }
.landing-heading > p:last-child { color: var(--muted); line-height: 1.65; }

.track-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.track-card {
  position: relative;
  overflow: hidden;
  min-height: 205px;
  padding: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 19px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 14px 35px rgba(31, 38, 89, 0.11);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.track-card::after {
  content: "";
  position: absolute;
  width: 110px;
  height: 110px;
  right: -42px;
  top: -45px;
  border-radius: 50%;
  background: var(--track-color);
  opacity: 0.13;
}
.track-card:hover { transform: translateY(-4px); box-shadow: 0 20px 45px rgba(31, 38, 89, 0.16); }
.track-cyan { --track-color: #06b6d4; }
.track-blue { --track-color: #3b82f6; }
.track-violet { --track-color: #8b5cf6; }
.track-pink { --track-color: #ec4899; }
.track-orange { --track-color: #f59e0b; }
.track-green { --track-color: #10b981; }
.track-number { color: var(--track-color); font: 800 0.75rem/1 "Chakra Petch", sans-serif; letter-spacing: 0.12em; }
.track-card h3 { margin-top: 0.85rem; font-size: 1.2rem; }
.track-card p { min-height: 3.9em; color: var(--muted); font-size: 0.86rem; line-height: 1.5; }
.track-tag { display: inline-block; padding: 0.32rem 0.55rem; border-radius: 8px; color: var(--track-color); background: color-mix(in srgb, var(--track-color) 10%, white); font-size: 0.7rem; font-weight: 800; }

.workflow-section { padding: clamp(1.3rem, 3vw, 2rem); }
.workflow-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: workflow;
}
.workflow-list li {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  padding: 1rem;
  border-radius: 15px;
  background: rgba(239, 246, 255, 0.72);
}
.workflow-list li > span {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #0ea5e9);
  font: 800 0.8rem/1 "Chakra Petch", sans-serif;
}
.workflow-list h3 { font-size: 0.95rem; }
.workflow-list p { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.78rem; line-height: 1.5; }

.lab-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: center;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-radius: 22px;
  color: #e2e8f0;
  background:
    radial-gradient(circle at 90% 10%, rgba(34, 211, 238, 0.18), transparent 32%),
    linear-gradient(145deg, #0f172a, #111c34);
  box-shadow: 0 25px 65px rgba(15, 23, 42, 0.3);
}
.lab-feature h2 { margin-top: 0.45rem; color: #fff; font-size: clamp(1.7rem, 3vw, 2.5rem); }
.lab-feature-copy > p:not(.eyebrow) { color: #aebdd0; line-height: 1.7; }
.lab-feature .eyebrow { color: #67e8f9; }
.check-list { display: grid; gap: 0.65rem; margin: 1.2rem 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 1.65rem; color: #cbd5e1; font-size: 0.88rem; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: #6ee7b7; font-weight: 900; }

.code-preview {
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 16px;
  background: #090f1c;
  box-shadow: 0 22px 45px rgba(0, 0, 0, 0.28);
}
.code-tabs { display: flex; gap: 1rem; padding: 0.75rem 1rem 0; color: #64748b; font-size: 0.72rem; background: #111827; }
.code-tabs span { padding-bottom: 0.65rem; }
.code-tabs .active { border-bottom: 2px solid #22d3ee; color: #e2e8f0; }
.code-preview pre { min-height: 220px; margin: 0; padding: 1.2rem; overflow: auto; color: #d6deeb; font: 500 0.79rem/1.75 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.code-preview code i { display: inline-block; width: 1.8rem; color: #475569; font-style: normal; user-select: none; }
.code-preview code b { color: #c084fc; }
.code-preview mark { padding: 0.12rem 0.25rem; color: #fde68a; background: rgba(245, 158, 11, 0.16); border: 1px dashed rgba(245, 158, 11, 0.55); border-radius: 4px; }
.code-footer { display: flex; justify-content: space-between; align-items: center; padding: 0.75rem 1rem; border-top: 1px solid rgba(148, 163, 184, 0.14); color: #64748b; font-size: 0.72rem; background: #111827; }
.code-footer strong { padding: 0.45rem 0.65rem; border-radius: 7px; color: #062b27; background: #5eead4; }

.audience-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.85rem; }
.audience-card { padding: clamp(1.4rem, 3vw, 2.1rem); border: 1px solid rgba(255, 255, 255, 0.7); border-radius: 20px; box-shadow: 0 16px 40px rgba(31, 38, 89, 0.12); }
.student-card { background: linear-gradient(145deg, rgba(239, 246, 255, 0.94), rgba(224, 242, 254, 0.9)); }
.parent-card { background: linear-gradient(145deg, rgba(255, 247, 237, 0.94), rgba(255, 241, 242, 0.9)); }
.audience-card h2 { margin-top: 0.45rem; font-size: clamp(1.4rem, 2.5vw, 1.9rem); }
.audience-card > p:not(.eyebrow) { color: var(--muted); line-height: 1.65; }
.audience-card ul { display: grid; gap: 0.45rem; padding-left: 1.15rem; color: var(--muted); font-size: 0.86rem; }

.landing-final {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  margin: 1.4rem 0 0;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(34, 211, 238, 0.28), transparent 32%),
    linear-gradient(135deg, #3730a3, #4f46e5 55%, #7c3aed);
}
.landing-final .eyebrow { color: #a5f3fc; }
.landing-final h2 { margin-top: 0.4rem; font-size: clamp(1.5rem, 3vw, 2.2rem); }
.landing-final p:last-child { max-width: 700px; margin-bottom: 0; color: #dbeafe; }
.landing-final .btn-primary { flex: 0 0 auto; color: var(--primary-strong); background: #fff; box-shadow: 0 14px 35px rgba(15, 23, 42, 0.25); }

.metric {
  background: linear-gradient(160deg, #f5fafe, #eef7fe);
  border: 1px solid #cde5f5;
  border-radius: 16px;
  padding: 0.9rem 1rem;
}

.metric-label {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  color: var(--muted);
  font-weight: 700;
}

.metric-value {
  margin: 0.3rem 0 0;
  font-weight: 700;
}

.overview-grid {
  margin-top: 1.2rem;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat {
  padding: 1rem 1.1rem;
}

.stat-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
}

.stat h3 {
  margin-top: 0.45rem;
  font-size: 1.45rem;
}

.muted {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.main-grid {
  margin-top: 1rem;
  display: grid;
  gap: 0.95rem;
  grid-template-columns: 1.05fr 1.7fr 0.82fr;
  align-items: start;
}

.center-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.right-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-section {
  margin-top: 1.2rem;
  padding: 1rem;
}

.about-content {
  padding: 0.6rem 1.1rem 0.5rem;
}

.about-content p {
  margin: 0.5rem 0;
  color: var(--muted);
  line-height: 1.5;
}

.news-section,
.feedback-section {
  padding-bottom: 1rem;
}

.featured-news {
  position: relative;
  overflow: hidden;
  border-color: rgba(255, 255, 255, 0.76);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.93), rgba(255, 245, 251, 0.84));
}

.featured-news::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  top: -105px;
  right: -55px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.45), rgba(247, 37, 133, 0.38));
  filter: blur(10px);
  pointer-events: none;
}

.section-kicker {
  margin: 0 0 0.3rem !important;
  color: var(--accent) !important;
  font-size: 0.72rem !important;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.news-list {
  display: grid;
  gap: 0.65rem;
  padding: 0.6rem 1.1rem 0.2rem;
}

.news-item {
  position: relative;
  z-index: 1;
  border: 1px solid rgba(216, 232, 248, 0.85);
  border-left: 4px solid var(--accent);
  background: rgba(255, 255, 255, 0.78);
  border-radius: 14px;
  padding: 0.8rem 0.9rem;
  box-shadow: 0 9px 24px rgba(57, 40, 105, 0.07);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.news-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(57, 40, 105, 0.12);
}

.news-item h3 {
  margin: 0.12rem 0 0;
  font-size: 1.02rem;
}

.news-meta {
  margin: 0;
  color: var(--primary-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.news-message {
  margin: 0.45rem 0 0;
  color: #294b6a;
  line-height: 1.45;
  white-space: pre-wrap;
}

.feedback-status {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.admin-panel {
  margin-top: 1rem;
  padding-bottom: 0.9rem;
}

.admin-controls {
  padding: 0.35rem 1.1rem 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.admin-news-form {
  margin: 0.45rem 1.1rem 0.75rem;
  display: grid;
  gap: 0.5rem;
  border: 1px dashed #cfe2f4;
  border-radius: 14px;
  padding: 0.75rem;
  background: rgba(250, 253, 255, 0.72);
}

.admin-news-form h3 {
  margin: 0 0 0.15rem;
  font-size: 1rem;
}

.admin-news-form input,
.admin-news-form textarea {
  width: 100%;
  padding: 0.6rem 0.65rem;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
}

.admin-news-form button {
  justify-self: start;
}

.admin-users {
  padding: 0.2rem 1.1rem 0.2rem;
  display: grid;
  gap: 0.55rem;
}

.admin-user-row {
  border: 1px solid #d9e8f8;
  border-radius: 12px;
  background: #fafdff;
  padding: 0.3rem;
}

.admin-user-summary {
  list-style: none;
  cursor: pointer;
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  padding: 0.45rem 0.5rem;
}

.admin-user-summary::-webkit-details-marker {
  display: none;
}

.admin-user-body {
  border-top: 1px dashed #cfe2f4;
  margin-top: 0.35rem;
  padding: 0.55rem 0.5rem 0.45rem;
}

.admin-user-head {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.admin-user-order {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: #e8f2ff;
  color: #0f4fa5;
  font-family: "Chakra Petch", sans-serif;
  font-weight: 700;
}

.admin-user-name {
  margin: 0;
  font-weight: 700;
}

.admin-user-email {
  margin: 0.18rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.admin-user-stats {
  margin: 0.2rem 0 0.55rem;
  color: #244766;
  font-size: 0.9rem;
}

.admin-user-points {
  font-weight: 800;
  color: #0f4fa5;
  font-size: 0.96rem;
  background: #e6f2ff;
  border: 1px solid #cfe4ff;
  border-radius: 999px;
  padding: 0.3rem 0.55rem;
}

.admin-lesson-breakdown {
  display: grid;
  gap: 0.45rem;
}

.admin-lesson-item {
  border: 1px solid #d8e8f8;
  background: #fff;
  border-radius: 10px;
  padding: 0.45rem 0.55rem;
}

.admin-lesson-title {
  margin: 0;
  font-weight: 700;
  color: #173651;
}

.admin-lesson-score {
  margin: 0.27rem 0 0;
  color: #325474;
  font-size: 0.88rem;
}

.admin-lesson-time {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.admin-user-actions {
  margin-top: 0.65rem;
}

.admin-feedback-wrap {
  margin: 0.35rem 1.1rem 0.2rem;
  border-top: 1px dashed #cfe2f4;
  padding-top: 0.7rem;
}

.admin-feedback-wrap h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.admin-feedback {
  display: grid;
  gap: 0.5rem;
}

.admin-feedback-item {
  border: 1px solid #d8e8f8;
  background: #fafdff;
  border-radius: 10px;
  padding: 0.5rem 0.6rem;
}

.admin-feedback-head {
  margin: 0;
  font-weight: 700;
  color: #173651;
  font-size: 0.88rem;
}

.admin-feedback-page {
  margin: 0.22rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.admin-feedback-message {
  margin: 0.33rem 0 0;
  color: #294b6a;
  white-space: pre-wrap;
  font-size: 0.9rem;
}

.card-head {
  padding: 1rem 1.1rem 0.4rem;
}

.card-head p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.lesson-list {
  overflow: hidden;
}

.lessons {
  padding: 0.2rem 0.8rem 1rem;
  display: grid;
  gap: 1rem;
  max-height: 74vh;
  overflow: auto;
}

.path-unit {
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.56);
  overflow: hidden;
}

.path-unit-head {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 0.85rem 1rem;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.95), rgba(247, 37, 133, 0.88));
  color: #fff;
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.18);
}

.path-unit-head span {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  opacity: 0.82;
  font-weight: 800;
}

.path-unit-head h3 {
  margin-top: 0.2rem;
  font-size: 1.08rem;
}

.path-road {
  position: relative;
  display: grid;
  gap: 0.7rem;
  padding: 1rem 0.75rem 1.1rem;
}

.path-road::before {
  content: "";
  position: absolute;
  top: 0.3rem;
  bottom: 0.3rem;
  left: 50%;
  width: 8px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.22), rgba(247, 37, 133, 0.2), rgba(20, 184, 166, 0.22));
}

.path-node {
  all: unset;
  position: relative;
  z-index: 0;
  width: min(100%, 520px);
  display: grid;
  grid-template-columns: 58px 1fr;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  transition: transform 150ms ease, filter 150ms ease;
}

.path-node.step-0,
.path-node.step-3 {
  justify-self: start;
}

.path-node.step-1 {
  justify-self: center;
}

.path-node.step-2 {
  justify-self: end;
}

.path-node:hover {
  transform: translateY(-2px) scale(1.01);
}

.path-node-icon {
  width: 58px;
  height: 58px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-family: "Chakra Petch", sans-serif;
  font-size: 0.98rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, #22c55e, #14b8a6);
  border: 4px solid rgba(255, 255, 255, 0.92);
  box-shadow: 0 14px 28px rgba(20, 184, 166, 0.28);
}

.path-node.test-node .path-node-icon {
  background: linear-gradient(135deg, #f59e0b, #f72585);
  box-shadow: 0 14px 28px rgba(247, 37, 133, 0.25);
}

.path-node.completed .path-node-icon {
  background: linear-gradient(135deg, #16a34a, #22c55e);
}

.path-node.locked .path-node-icon {
  background: linear-gradient(135deg, #94a3b8, #64748b);
  box-shadow: none;
}

.path-node-body {
  display: block;
  border: 1px solid rgba(216, 232, 248, 0.88);
  border-radius: 16px;
  padding: 0.68rem 0.78rem;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 10px 22px rgba(33, 80, 133, 0.08);
}

.path-node.locked .path-node-body {
  opacity: 0.78;
  background: rgba(244, 247, 250, 0.88);
}

.lesson-track {
  display: block;
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  font-weight: 800;
}

.path-node-body strong {
  display: block;
  margin-top: 0.15rem;
  font-family: "Chakra Petch", sans-serif;
  font-size: 1rem;
}

.path-node-body small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  line-height: 1.35;
}

.lesson-tags {
  margin-top: 0.5rem;
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.lesson-tags span {
  border-radius: 999px;
  padding: 0.18rem 0.52rem;
  font-size: 0.72rem;
  border: 1px solid #dceaf8;
  background: #f3f8ff;
}

.lesson-detail {
  padding-bottom: 1rem;
}

.lesson-content {
  padding: 0.6rem 1.1rem 0.5rem;
  max-height: 69vh;
  overflow: auto;
}

.empty-state {
  color: var(--muted);
  font-style: italic;
}

.lesson-path-switcher {
  margin-bottom: 1rem;
  padding: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(247, 37, 133, 0.09), rgba(34, 211, 238, 0.11));
}

.lesson-path-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.7rem;
}

.lesson-path-heading strong {
  font-family: "Chakra Petch", sans-serif;
  font-size: 1.05rem;
}

.lesson-path-heading span {
  color: var(--muted);
  font-size: 0.82rem;
}

.lesson-path-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
}

.lesson-path-option {
  border: 1px solid #d8e5f3;
  border-radius: 14px;
  padding: 0.7rem 0.55rem;
  display: grid;
  place-items: center;
  gap: 0.25rem;
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.lesson-path-option > span {
  font-size: 1.4rem;
}

.lesson-path-option:hover {
  transform: translateY(-2px);
  border-color: rgba(79, 70, 229, 0.45);
}

.lesson-path-option.active {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.14), rgba(247, 37, 133, 0.1));
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.16);
  color: var(--primary-strong);
}

.lesson-section {
  margin-bottom: 1rem;
  border: 1px solid #cfe2f4;
  border-radius: 14px;
  padding: 0.8rem 0.9rem;
  background: #f7fbff;
}

.lesson-section h4 {
  margin-bottom: 0.45rem;
}

.lesson-section p {
  margin: 0.35rem 0;
  color: #29445f;
  line-height: 1.56;
}

.code-sample {
  margin-top: 0.75rem;
  border: 1px solid #d6e4f3;
  border-radius: 12px;
  overflow: hidden;
  background: #fbfdff;
}

.code-sample-title {
  margin: 0;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid #e4edf7;
  background: #f3f8ff;
  color: #1a3e5f;
  font-weight: 700;
  font-size: 0.86rem;
}

.code-sample pre {
  margin: 0;
  padding: 0;
  overflow-x: auto;
  background: #282c34;
}

.code-sample pre code {
  display: block;
  padding: 0.75rem 0.8rem;
  font-family: "Chakra Petch", "Consolas", monospace;
  font-size: 0.84rem;
  line-height: 1.38;
  background: #282c34;
  color: #abb2bf;
}

.code-sample pre code.hljs {
  padding: 0.75rem 0.8rem;
}

.code-sample-output-label {
  margin: 0;
  padding: 0.35rem 0.6rem 0.1rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: #2d7a4f;
  background: #f0faf4;
  border-top: 1px solid #d4eee0;
}

.code-sample-output {
  margin: 0;
  padding: 0.55rem 0.8rem;
  overflow-x: auto;
  background: #0d2110;
  color: #a8efbf;
  font-family: "Chakra Petch", "Consolas", monospace;
  font-size: 0.84rem;
  line-height: 1.38;
}

.bash-emulator {
  border-color: #c9d4ff;
  background: linear-gradient(180deg, #f8f9ff 0%, #f4f8ff 100%);
}

.terminal-shell {
  margin-top: 0.75rem;
  border-radius: 12px;
  border: 1px solid #1e2f48;
  background: #09111d;
  color: #c9e6ff;
  overflow: hidden;
}

.terminal-output {
  min-height: 180px;
  max-height: 300px;
  overflow: auto;
  padding: 0.65rem 0.72rem;
  font-family: "Chakra Petch", "Consolas", monospace;
  font-size: 0.84rem;
  line-height: 1.34;
}

.terminal-line {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.terminal-line.cmd {
  color: #91d1ff;
}

.terminal-line.err {
  color: #ff9f9f;
}

.terminal-line.info {
  color: #ffdd85;
}

.terminal-form {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 0.72rem;
  border-top: 1px solid rgba(201, 230, 255, 0.22);
  background: rgba(7, 17, 31, 0.9);
}

.terminal-prompt {
  font-family: "Chakra Petch", "Consolas", monospace;
  color: #8fe0b3;
  font-size: 0.82rem;
  white-space: nowrap;
}

.terminal-input {
  flex: 1;
  min-width: 0;
  border: 1px solid rgba(173, 220, 255, 0.3);
  background: rgba(8, 20, 36, 0.8);
  color: #deefff;
  border-radius: 9px;
  padding: 0.45rem 0.55rem;
  font-family: "Chakra Petch", "Consolas", monospace;
}

.terminal-input:focus {
  outline: none;
  border-color: #7cbcff;
  box-shadow: 0 0 0 2px rgba(124, 188, 255, 0.22);
}

.terminal-shortcuts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.65rem;
}

.terminal-shortcut-btn {
  border: 1px solid #b7cdf3;
  background: #eef4ff;
  color: #264d86;
  border-radius: 999px;
  padding: 0.18rem 0.6rem;
  font-size: 0.78rem;
  font-family: "Chakra Petch", "Consolas", monospace;
  cursor: pointer;
}

.terminal-shortcut-btn:hover {
  background: #dce9ff;
  border-color: #8fb3eb;
}

.terminal-shortcut-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(98, 151, 235, 0.35);
}

.lesson-page-shell {
  margin-top: 0.9rem;
  padding-bottom: 1.2rem;
}

.lesson-auth-card {
  padding-bottom: 0.8rem;
}

.lesson-page {
  padding-bottom: 1rem;
}

.lesson-page-content {
  padding: 0.55rem 1.1rem 0.4rem;
}

.quiz-title {
  margin-top: 1.1rem;
  margin-bottom: 0.45rem;
}

.quiz-question {
  margin: 0.7rem 0;
  padding: 0.75rem;
  border-radius: 14px;
  border: 1px solid #dbe8f4;
  background: #f7fbff;
}

.quiz-question p {
  margin: 0;
  font-weight: 700;
}

.option-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: 0.45rem;
  font-size: 0.94rem;
  color: #1d3955;
}

.option-row input[type="radio"] {
  margin-top: 0.24rem;
}

.ctf-answer-label {
  display: grid;
  gap: 0.35rem;
  margin: 0.8rem 0;
  color: #173651;
  font-weight: 800;
}

.ctf-answer-label input {
  width: 100%;
  border: 1px solid #cbdff2;
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  font: inherit;
}

.ctf-code-editor,
.ctf-code-output {
  width: 100%;
  margin: 0.8rem 0;
  border: 1px solid #cbdff2;
  border-radius: 10px;
  padding: 0.8rem;
  font: 0.9rem/1.5 "Chakra Petch", monospace;
  background: #101b2a;
  color: #eef7ff;
}

.ctf-code-editor {
  min-height: 9rem;
  resize: vertical;
}

.ctf-code-output {
  white-space: pre-wrap;
  min-height: 2.5rem;
}

.ctf-planned-box {
  margin-top: 1rem;
  padding: 0.9rem;
  border-radius: 14px;
  border: 1px solid #c4dcff;
  background: #eef7ff;
}

.ctf-planned-box h4 {
  margin-bottom: 0.45rem;
  color: #15508f;
}

.ctf-planned-box p {
  margin: 0.3rem 0;
}

.linux-vm {
  overflow: hidden;
  margin-top: 0.9rem;
  border: 1px solid #1f3850;
  border-radius: 14px;
  background: #07111d;
  color: #d8e8f5;
  box-shadow: 0 16px 36px rgba(7, 17, 29, 0.18);
}

.linux-vm-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid #20364b;
  background: #0c1b2b;
}

.linux-vm-head div {
  display: grid;
  gap: 0.12rem;
}

.linux-vm-head strong {
  color: #fff;
  font-family: "Chakra Petch", monospace;
}

.linux-vm-head span,
.linux-vm-status {
  font-size: 0.8rem;
  color: #9db3c6;
}

.linux-vm-badge {
  flex: 0 0 auto;
  padding: 0.24rem 0.48rem;
  border: 1px solid #1b8d69;
  border-radius: 999px;
  background: rgba(28, 183, 133, 0.1);
  color: #65e3b8 !important;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.linux-vm-status {
  min-height: 1.2rem;
  margin: 0 !important;
  padding: 0.65rem 0.85rem 0;
}

.linux-vm-controls {
  display: flex;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
}

.linux-vm-guide {
  margin: 0 0.85rem 0.75rem;
  padding: 0.85rem;
  border: 1px solid #27506d;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(22, 61, 88, 0.8), rgba(12, 35, 52, 0.9));
}

.linux-vm-guide > strong {
  color: #fff;
  font-family: "Chakra Petch", sans-serif;
}

.linux-vm-guide ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0.7rem 0 0;
  padding: 0;
  list-style: none;
}

.linux-vm-guide li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #d8e8f5;
  font-size: 0.84rem;
}

.linux-vm-guide li span {
  flex: 0 0 auto;
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: #1e5eb8;
  color: #fff;
  font-weight: 900;
}

.linux-vm-editor {
  margin: 0 0.85rem 0.85rem;
  overflow: hidden;
  border: 1px solid #2a465f;
  border-radius: 14px;
  background: #0c1b2b;
}

.linux-vm-editor-head,
.linux-vm-terminal-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  padding: 0.6rem 0.75rem;
  color: #fff;
  font-size: 0.82rem;
}

.linux-vm-editor-head span,
.linux-vm-terminal-label span {
  color: #8eabc0;
  font-size: 0.75rem;
}

.linux-vm-editor textarea {
  display: block;
  width: 100%;
  min-height: 15rem;
  resize: vertical;
  border: 0;
  border-block: 1px solid #2a465f;
  border-radius: 0;
  padding: 0.85rem;
  outline: none;
  background: #02070d;
  color: #e7f5ff;
  tab-size: 2;
  font: 0.88rem/1.5 "Chakra Petch", "Consolas", monospace;
}

.linux-vm-editor textarea:focus {
  box-shadow: inset 0 0 0 2px rgba(101, 227, 184, 0.45);
}

.linux-vm-editor-actions {
  display: flex;
  gap: 0.55rem;
  padding: 0.65rem 0.75rem;
  flex-wrap: wrap;
}

.linux-vm-terminal-label {
  border-top: 1px solid #20364b;
  background: #081522;
}

.linux-vm-terminal {
  overflow: auto;
  height: 21rem;
  margin: 0;
  padding: 0.9rem;
  border-block: 1px solid #20364b;
  border-radius: 0;
  background: #02070d;
  color: #b9f6d2;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 0.86rem/1.42 "Chakra Petch", "Consolas", monospace;
}

.linux-vm-command {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 0.85rem;
}

.linux-vm-command > span {
  color: #65e3b8;
  font-family: monospace;
  font-weight: 800;
}

.linux-vm-command input,
.linux-vm-answer input {
  min-width: 0;
  border: 1px solid #2a465f;
  border-radius: 9px;
  padding: 0.62rem 0.7rem;
  background: #0c1b2b;
  color: #fff;
  font: 0.88rem "Chakra Petch", monospace;
}

.linux-vm-command input:focus,
.linux-vm-answer input:focus {
  outline: 2px solid rgba(101, 227, 184, 0.4);
  border-color: #65e3b8;
}

.linux-vm-answer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.55rem;
  padding: 0 0.85rem 0.85rem;
}

.linux-vm-answer input.flag-found {
  border-color: #34d399;
  background: rgba(16, 185, 129, 0.13);
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.16);
}

/* global style for inline bash commands wrapped in backticks */
.bash-cmd {
  display: inline-block;
  padding: 0.04rem 0.36rem;
  border-radius: 8px;
  background: #e9f3ff;
  border: 1px solid #c4dcff;
  color: #15508f;
  font-family: "Chakra Petch", "Consolas", monospace;
  font-size: 0.92em;
  font-weight: 700;
  line-height: 1.3;
}


.lesson-actions {
  margin-top: 0.8rem;
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
}

.result-box {
  margin-top: 0.8rem;
  border-radius: 14px;
  padding: 0.8rem;
  border: 1px solid #d4e6fb;
  background: #f4f9ff;
}

.result-box.good {
  border-color: #bde8d2;
  background: #edfcf4;
}

.result-box.warn {
  border-color: #ffdca9;
  background: #fff7ea;
}

/* Footer */
.site-footer {
  margin-top: 2rem;
  padding: 1rem 0 2.2rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

/* Feedback form styles */
.feedback-form {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.feedback-form input,
.feedback-form textarea {
  width: 100%;
  padding: 0.6rem 0.65rem;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  font-size: 0.95rem;
}
.feedback-form button {
  justify-self: start;
}

.feedback-status-ok {
  color: #0f7a43;
  font-weight: 600;
}

.feedback-status-error {
  color: #b42318;
  font-weight: 600;
}

.breakdown {
  margin-top: 0.65rem;
  display: grid;
  gap: 0.45rem;
}

.breakdown-item {
  border-radius: 12px;
  border: 1px solid #dce8f5;
  background: #fff;
  padding: 0.55rem 0.65rem;
  font-size: 0.9rem;
}

.breakdown-item.correct {
  border-color: #c8ebd8;
}

.breakdown-item.wrong {
  border-color: #f1d7d7;
}

.leaderboard,
#public-leaderboard {
  padding-bottom: 0.9rem;
}

.leaderboard-list {
  padding: 0.4rem 0.9rem 0.2rem;
  display: grid;
  gap: 0.5rem;
}

.rank-row {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid #d8e6f4;
  background: #fafdff;
  border-radius: 12px;
  padding: 0.5rem 0.6rem;
}

.rank-no {
  width: 30px;
  height: 30px;
  border-radius: 999px;
  background: #f0f6ff;
  color: #1d4f84;
  display: grid;
  place-items: center;
  font-family: "Chakra Petch", sans-serif;
  font-weight: 700;
}

.rank-name {
  font-weight: 700;
  margin: 0;
}

.rank-email {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.rank-points {
  font-weight: 800;
  color: var(--primary-strong);
  font-size: 0.95rem;
}

#public-leaderboard {
  margin-top: 1rem;
}

.appear {
  animation: reveal 550ms ease both;
  animation-delay: var(--delay, 0s);
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.is-hidden {
  display: none !important;
}

@media (max-width: 1100px) {
  .main-grid {
    grid-template-columns: 1fr;
  }

  .lesson-content,
  .lessons {
    max-height: unset;
  }
}

@media (max-width: 840px) {
  .linux-vm-guide ol {
    grid-template-columns: 1fr;
  }

  .linux-vm-command {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .linux-vm-answer {
    grid-template-columns: 1fr;
  }

  .lesson-path-options {
    grid-template-columns: 1fr;
  }

  .lesson-path-option {
    grid-template-columns: auto 1fr;
    justify-items: start;
  }

  .lesson-path-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .path-road::before {
    left: 29px;
    transform: none;
  }

  .path-node,
  .path-node.step-0,
  .path-node.step-1,
  .path-node.step-2,
  .path-node.step-3 {
    justify-self: stretch;
    width: 100%;
  }

  .hero,
  .lab-feature {
    grid-template-columns: 1fr;
  }

  .landing-hero {
    padding-bottom: 2.5rem;
  }

  .hero-lab {
    width: min(620px, 100%);
    margin: 0 auto;
  }

  .track-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workflow-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .overview-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .admin-controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .admin-user-summary {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 600px) {
  .landing-hero {
    min-height: auto;
    padding: 1.3rem;
  }

  .landing-hero h2 {
    font-size: clamp(2rem, 12vw, 3rem);
  }

  .hero-actions,
  .hero-actions .btn {
    width: 100%;
  }

  .hero-lab {
    padding: 0.8rem 0;
  }

  .lab-window {
    transform: none;
  }

  .lab-window-bar {
    grid-template-columns: auto 1fr;
  }

  .lab-window-bar > span:not(.lab-secure) {
    display: none;
  }

  .lab-secure {
    justify-self: end;
  }

  .lab-terminal {
    min-height: 190px;
    padding: 1rem;
    font-size: 0.72rem;
  }

  .floating-proof {
    display: none;
  }

  .landing-trust,
  .track-grid,
  .workflow-list,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .landing-trust {
    gap: 0;
  }

  .landing-trust div {
    grid-template-columns: 72px 1fr;
    align-items: center;
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  }

  .landing-trust div:last-child {
    border-bottom: 0;
  }

  .track-card {
    min-height: auto;
  }

  .track-card p {
    min-height: auto;
  }

  .workflow-list li {
    padding: 0.85rem;
  }

  .lab-feature {
    padding: 1.3rem;
  }

  .code-preview pre {
    min-height: 190px;
    font-size: 0.69rem;
  }

  .landing-final {
    align-items: flex-start;
    flex-direction: column;
  }

  .landing-final .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .landing-hero *,
  .track-card,
  .terminal-cursor {
    animation: none !important;
    transition: none !important;
  }
}