:root {
  color-scheme: dark;
  --ink: #f7f7f2;
  --muted: #a9afc0;
  --night: #101426;
  --panel: #171c31;
  --panel-2: #20263e;
  --line: #303650;
  --lime: #d8ff62;
  --orange: #ff8c5a;
  --blue: #7788ff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--night); }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 6%, rgba(119, 136, 255, 0.18), transparent 28rem),
    radial-gradient(circle at 2% 72%, rgba(255, 140, 90, 0.08), transparent 24rem),
    var(--night);
  font-size: 16px;
  line-height: 1.5;
}
button { font: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid rgba(216, 255, 98, 0.65); outline-offset: 3px; }

.app-header {
  min-height: 76px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 60px);
  border-bottom: 1px solid var(--line);
  background: rgba(16, 20, 38, 0.82);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; width: fit-content; color: var(--ink); font-size: 1.25rem; font-weight: 850; letter-spacing: -0.04em; text-decoration: none; }
.brand-mark { width: 35px; height: 35px; display: grid; place-items: center; border-radius: 10px; color: var(--night); background: var(--lime); font-size: 1rem; letter-spacing: 0; }
.journey { display: flex; align-items: center; }
.journey-step { display: flex; align-items: center; gap: 8px; color: #7c839a; font-size: 0.84rem; font-weight: 760; }
.journey-step b { width: 26px; height: 26px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; font-size: 0.74rem; }
.journey-step.is-current { color: var(--ink); }
.journey-step.is-current b { border-color: var(--lime); color: var(--night); background: var(--lime); }
.journey-line { width: clamp(24px, 5vw, 68px); height: 1px; margin: 0 10px; background: var(--line); }
.language-pill { justify-self: end; min-height: 38px; border: 1px solid var(--line); border-radius: 999px; padding: 0 13px; color: var(--ink); background: var(--panel); font-size: 0.78rem; font-weight: 820; cursor: pointer; }
.language-pill span { margin: 0 4px; color: var(--orange); }

.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: clamp(34px, 6vw, 72px) 0 110px; }
.lesson-bar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: clamp(36px, 6vw, 70px); }
.lesson-source { display: flex; align-items: center; gap: 12px; }
.source-monogram { width: 44px; height: 56px; display: grid; place-items: center; border: 1px solid #454d70; border-radius: 9px; color: var(--lime); background: linear-gradient(145deg, #2b3355, #171c31); font-size: 1.2rem; font-weight: 900; }
.lesson-source div { display: grid; }
.lesson-source span, .lesson-meta { color: var(--muted); font-size: 0.76rem; font-weight: 720; }
.lesson-source strong { font-size: 1rem; }
.lesson-source small { color: var(--muted); font-weight: 600; }
.lesson-meta { display: flex; gap: 8px; }
.lesson-meta span { padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px; background: rgba(23, 28, 49, 0.72); }

.heading-row { display: grid; grid-template-columns: minmax(0, 1fr) 310px; align-items: end; gap: clamp(30px, 7vw, 90px); }
.eyebrow { margin: 0 0 12px; color: var(--orange); font-size: 0.76rem; font-weight: 850; letter-spacing: 0.12em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2.45rem, 6.7vw, 5.4rem); line-height: 0.97; letter-spacing: -0.067em; }
h1 em { color: var(--lime); font-family: Georgia, "Times New Roman", serif; font-weight: 500; }
.lede { max-width: 680px; margin: 22px 0 0; color: var(--muted); font-size: clamp(1rem, 2vw, 1.12rem); }
.safe-note { display: grid; grid-template-columns: 34px 1fr; gap: 12px; padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: rgba(23, 28, 49, 0.72); }
.safe-note > span { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; color: var(--night); background: var(--lime); font-size: 1.2rem; font-weight: 900; }
.safe-note p { margin: 0; color: var(--muted); font-size: 0.83rem; }
.safe-note strong { display: block; margin-bottom: 3px; color: var(--ink); font-size: 0.9rem; }

.scan-help { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 48px 0 14px; color: var(--muted); font-size: 0.84rem; }
.scan-help button { border: 0; padding: 5px 0; color: var(--lime); background: none; font-size: 0.82rem; font-weight: 800; cursor: pointer; }
.word-cloud { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.word-chip { min-height: 58px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; border: 1px solid var(--line); border-radius: 13px; padding: 0 14px; color: var(--ink); background: var(--panel); text-align: left; font-size: 0.92rem; font-weight: 720; cursor: pointer; transition: transform 150ms ease, border-color 150ms ease, background 150ms ease; }
.word-chip:hover { transform: translateY(-1px); border-color: #555e83; background: var(--panel-2); }
.word-chip span { color: #747c96; font-size: 0.68rem; font-variant-numeric: tabular-nums; }
.word-chip i { width: 25px; height: 25px; display: grid; place-items: center; border: 1px solid #434a68; border-radius: 50%; color: var(--muted); font-style: normal; font-size: 0.8rem; }
.word-chip.is-selected { border-color: var(--lime); color: var(--night); background: var(--lime); }
.word-chip.is-selected span { color: #596b1a; }
.word-chip.is-selected i { border-color: var(--night); color: var(--night); }

.action-dock { position: sticky; bottom: 16px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px; margin-top: 26px; padding: 14px 16px 14px 20px; border: 1px solid #3a4262; border-radius: 18px; background: rgba(23, 28, 49, 0.94); box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35); backdrop-filter: blur(16px); }
.action-dock > div { display: flex; align-items: baseline; gap: 9px; }
.action-dock > div strong { color: var(--lime); font-size: 1.6rem; }
.action-dock > div span, .action-dock p { color: var(--muted); font-size: 0.8rem; }
.action-dock p { margin: 0; }
.button-primary { min-height: 50px; border: 0; border-radius: 13px; padding: 0 19px; color: var(--night); background: var(--lime); font-weight: 850; cursor: pointer; }
.button-primary span { margin-left: 14px; }
.button-primary:disabled { cursor: not-allowed; opacity: 0.35; }
.toast { position: fixed; left: 50%; bottom: 30px; z-index: 20; padding: 12px 17px; border-radius: 999px; color: var(--night); background: var(--ink); font-size: 0.86rem; font-weight: 760; opacity: 0; transform: translate(-50%, 14px); pointer-events: none; transition: 180ms ease; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

.workspace[hidden] { display: none; }
.journey-step.is-done { color: var(--ink); }
.journey-step.is-done b { border-color: var(--blue); color: var(--ink); background: var(--blue); }
.lesson-topline { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 18px; color: var(--muted); font-size: 0.82rem; font-weight: 750; }
.lesson-topline > span { text-align: center; }
.lesson-topline > strong { justify-self: end; color: var(--ink); }
.text-button { width: fit-content; border: 0; padding: 5px 0; color: var(--lime); background: none; font-weight: 800; cursor: pointer; }
.slim-progress { height: 4px; margin: 14px 0 clamp(34px, 6vw, 62px); overflow: hidden; border-radius: 999px; background: var(--line); }
.slim-progress span { display: block; width: 10%; height: 100%; border-radius: inherit; background: var(--lime); transition: width 220ms ease; }

.learn-layout { display: grid; grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.55fr); align-items: start; gap: clamp(28px, 7vw, 90px); }
.learn-side { position: sticky; top: 28px; padding-top: 20px; }
.learn-side h2 { max-width: 260px; margin: 0; font-size: clamp(1.55rem, 3vw, 2.15rem); line-height: 1.04; letter-spacing: -0.045em; }
.learn-side p:not(.eyebrow) { max-width: 290px; margin: 18px 0; color: var(--muted); font-size: 0.9rem; }
.voice-legend { display: flex; align-items: center; gap: 8px; margin-top: 26px; color: var(--muted); font-size: 0.77rem; font-weight: 700; }
.voice-legend i { width: 8px; height: 8px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 5px rgba(255, 140, 90, 0.1); }
.learn-card { padding: clamp(24px, 5vw, 48px); border: 1px solid #3a4262; border-radius: 28px; background: linear-gradient(145deg, #1c223a, #151a2d); box-shadow: 0 30px 90px rgba(0, 0, 0, 0.28); }
.learn-card-top, .practice-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.type-badge { display: inline-flex; min-height: 28px; align-items: center; border: 1px solid #444c6b; border-radius: 999px; padding: 0 10px; color: var(--orange); background: #20263e; font-size: 0.7rem; font-weight: 850; letter-spacing: 0.06em; text-transform: uppercase; }
.icon-button { width: 44px; height: 44px; border: 1px solid #4a5375; border-radius: 50%; color: var(--night); background: var(--lime); font-weight: 900; cursor: pointer; }
.learn-card h1 { margin-top: 30px; color: var(--lime); font-size: clamp(2.6rem, 7vw, 5.3rem); overflow-wrap: anywhere; }
.phonetics { margin: 10px 0 0; color: #8f98b3; font-size: 0.9rem; }
.translation { margin: 32px 0 7px; color: var(--ink); font-size: clamp(1.25rem, 3vw, 1.65rem); font-weight: 780; line-height: 1.25; }
.definition-en { margin: 0; color: var(--muted); }
.voice-row { display: flex; align-items: center; gap: 8px; margin-top: 30px; }
.voice-row span { margin-right: 2px; color: var(--muted); font-size: 0.76rem; font-weight: 750; }
.voice-row button { min-height: 33px; border: 1px solid #444c6b; border-radius: 999px; padding: 0 11px; color: var(--ink); background: #222941; font-size: 0.74rem; font-weight: 800; cursor: pointer; }
.voice-row button:hover { border-color: var(--lime); color: var(--lime); }
.example-stack { display: grid; gap: 9px; margin-top: 22px; }
.example-row { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 13px; min-height: 58px; padding: 10px 11px 10px 15px; border: 1px solid #333b59; border-radius: 13px; background: rgba(16, 20, 38, 0.62); }
.example-row b { color: #737d9b; font-size: 0.68rem; }
.example-row p { margin: 0; font-size: 0.9rem; }
.example-row button { width: 34px; height: 34px; border: 1px solid #424b6c; border-radius: 50%; color: var(--lime); background: #242b46; cursor: pointer; }
.learn-actions { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 30px; }
.button-secondary { min-height: 48px; border: 1px solid #4b5474; border-radius: 13px; padding: 0 17px; color: var(--ink); background: transparent; font-weight: 800; cursor: pointer; }
.button-secondary:hover { border-color: #727da6; background: rgba(255, 255, 255, 0.03); }

.practice-card { width: min(820px, 100%); margin: 0 auto; padding: clamp(24px, 5vw, 48px); border: 1px solid #3a4262; border-radius: 28px; background: linear-gradient(145deg, #1c223a, #151a2d); box-shadow: 0 30px 90px rgba(0, 0, 0, 0.28); }
.keyboard-note { color: var(--muted); font-size: 0.74rem; font-weight: 750; }
.practice-card h1 { margin-top: 28px; font-size: clamp(2rem, 5vw, 3.75rem); }
.practice-instruction { max-width: 670px; margin: 15px 0 0; color: var(--muted); font-size: 0.95rem; }
.exercise-stage { margin-top: 34px; }
.question-prompt, .voice-phrase { margin-bottom: 20px; padding: 18px 20px; border-left: 4px solid var(--orange); border-radius: 0 13px 13px 0; color: var(--ink); background: rgba(16, 20, 38, 0.68); font-size: clamp(1.05rem, 3vw, 1.35rem); font-weight: 750; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.choice-button { min-height: 58px; border: 1px solid #3d4564; border-radius: 13px; padding: 10px 14px; color: var(--ink); background: #20263e; text-align: left; font-weight: 720; cursor: pointer; }
.choice-button:hover { border-color: #657096; }
.choice-button.is-selected { border-color: var(--lime); box-shadow: inset 0 0 0 1px var(--lime); }
.choice-button.is-correct { border-color: var(--lime); color: var(--night); background: var(--lime); }
.choice-button.is-wrong { border-color: #ff7493; color: #ffb0c1; background: rgba(255, 116, 147, 0.1); }
.audio-prompt { min-width: 190px; display: grid; grid-template-columns: 42px auto; align-items: center; gap: 0 12px; margin-bottom: 18px; border: 1px solid #485171; border-radius: 16px; padding: 12px 16px; color: var(--ink); background: #20263e; text-align: left; cursor: pointer; }
.audio-prompt > span { grid-row: 1 / 3; width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; color: var(--night); background: var(--lime); }
.audio-prompt strong { align-self: end; }
.audio-prompt small { align-self: start; color: var(--muted); }
.tile-tray { min-height: 82px; display: flex; align-items: center; flex-wrap: wrap; gap: 8px; border: 1px dashed #505a7b; border-radius: 15px; padding: 12px; background: rgba(16, 20, 38, 0.52); }
.tile-tray > span { margin: auto; color: #747d98; font-size: 0.84rem; }
.tile-bank { min-height: 60px; display: flex; align-items: flex-start; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tile-tray button, .tile-bank button { min-height: 42px; border: 1px solid #46506f; border-radius: 10px; padding: 0 13px; color: var(--ink); background: #252c47; font-weight: 740; cursor: pointer; }
.tile-tray button { border-color: var(--lime); color: var(--night); background: var(--lime); }
.dictation-field { display: grid; gap: 8px; color: var(--muted); font-size: 0.8rem; font-weight: 750; }
.dictation-field input { min-height: 58px; border: 1px solid #46506f; border-radius: 13px; padding: 0 16px; color: var(--ink); background: rgba(16, 20, 38, 0.72); font-size: 1rem; }
.dictation-field input:focus { border-color: var(--lime); outline: none; box-shadow: 0 0 0 3px rgba(216, 255, 98, 0.12); }
.voice-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.record-button { min-height: 50px; border: 0; border-radius: 13px; padding: 0 18px; color: var(--night); background: var(--orange); font-weight: 850; cursor: pointer; }
.record-button span { margin-right: 7px; color: #c23a2a; }
.record-button.is-recording { animation: pulse-record 1s ease infinite; }
@keyframes pulse-record { 50% { box-shadow: 0 0 0 8px rgba(255, 140, 90, 0.12); } }
.speech-result { display: grid; gap: 4px; margin-top: 17px; padding: 14px 16px; border-radius: 12px; color: var(--muted); background: rgba(16, 20, 38, 0.58); font-size: 0.84rem; }
.speech-result strong { color: var(--lime); font-size: 1rem; }
.speech-result span { color: var(--muted); }
.compact-button { width: fit-content; min-height: 38px; margin-top: 10px; font-size: 0.8rem; }
.feedback-panel { display: grid; gap: 3px; margin-top: 22px; padding: 14px 16px; border-radius: 12px; font-size: 0.86rem; }
.feedback-panel.is-correct { color: #d8ffb8; background: rgba(133, 214, 118, 0.12); }
.feedback-panel.is-wrong { color: #ffb8c7; background: rgba(255, 116, 147, 0.11); }
.feedback-panel strong { font-size: 0.96rem; }
.feedback-panel span { color: inherit; opacity: 0.82; }
.practice-action { width: 100%; margin-top: 20px; }
.practice-action.is-next { background: var(--ink); }

.complete-panel { width: min(880px, 100%); margin: 0 auto; padding: clamp(32px, 7vw, 68px); border: 1px solid #3a4262; border-radius: 30px; background: radial-gradient(circle at 80% 16%, rgba(216, 255, 98, 0.1), transparent 17rem), linear-gradient(145deg, #1c223a, #151a2d); box-shadow: 0 30px 90px rgba(0, 0, 0, 0.28); }
.score-orbit { width: 112px; height: 112px; display: grid; place-content: center; margin-bottom: 28px; border: 1px solid #53603b; border-radius: 50%; background: var(--lime); color: var(--night); text-align: center; transform: rotate(-4deg); }
.score-orbit strong { font-size: 2.6rem; line-height: 0.9; }
.score-orbit span { font-size: 0.72rem; font-weight: 800; }
.complete-panel h1 { font-size: clamp(2.4rem, 6vw, 5rem); }
.complete-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 34px; }
.complete-stats span { min-height: 76px; display: grid; align-content: center; padding: 13px; border: 1px solid #353d5a; border-radius: 13px; color: var(--muted); background: rgba(16, 20, 38, 0.54); font-size: 0.78rem; }
.complete-stats b { color: var(--lime); font-size: 1.35rem; }
.complete-actions { display: flex; gap: 11px; margin-top: 30px; }

@media (max-width: 860px) {
  .app-header { grid-template-columns: 1fr auto; }
  .journey { display: none; }
  .heading-row { grid-template-columns: 1fr; }
  .safe-note { max-width: 560px; }
  .word-cloud { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .learn-layout { grid-template-columns: 1fr; }
  .learn-side { position: static; padding-top: 0; }
  .learn-side p:not(.eyebrow) { max-width: 620px; }
}
@media (max-width: 620px) {
  .shell { width: min(100% - 24px, 520px); padding-top: 24px; }
  .lesson-bar { align-items: flex-start; margin-bottom: 38px; }
  .lesson-meta { display: grid; text-align: right; }
  h1 { font-size: clamp(2.35rem, 14vw, 4rem); }
  .word-cloud { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .word-chip { min-height: 54px; padding-inline: 11px; font-size: 0.85rem; }
  .word-chip span { display: none; }
  .action-dock { grid-template-columns: 1fr auto; }
  .action-dock p { display: none; }
  .action-dock > div { display: grid; gap: 0; }
  .action-dock > div strong { line-height: 1; }
  .lesson-topline { grid-template-columns: 1fr auto; }
  .lesson-topline > span { display: none; }
  .learn-card, .practice-card, .complete-panel { border-radius: 22px; }
  .choice-grid { grid-template-columns: 1fr; }
  .learn-actions, .complete-actions { align-items: stretch; flex-direction: column-reverse; }
  .learn-actions button, .complete-actions button { width: 100%; }
  .complete-stats { grid-template-columns: 1fr; }
  .complete-stats span { min-height: 62px; }
}
@media (max-width: 390px) {
  .word-cloud { grid-template-columns: 1fr; }
  .lesson-source div > span { display: none; }
  .button-primary span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}