:root{
  --bg:#ffffff; --bg-soft:#f3f3f3; --ink:#111111;
  --line: rgba(17,17,17,0.16); --gray:#6e6e6e; --accent: var(--ink);
  --radius: 14px; --shadow: 0 18px 40px rgba(0,0,0,0.14);
  --serif: "Newsreader", Georgia, serif; --sans: "Manrope", -apple-system, BlinkMacSystemFont, sans-serif;
}
html[data-theme="dark"]{
  --bg:#0a0a0a; --bg-soft:#181818; --ink:#f3f3f3;
  --line: rgba(243,243,243,0.18); --gray:#a3a3a3; --shadow: 0 18px 40px rgba(0,0,0,0.5);
}
*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{ margin:0; font-family:var(--sans); color:var(--ink); background:var(--bg); -webkit-font-smoothing:antialiased; transition:background .25s ease, color .25s ease; }
@media (prefers-reduced-motion: reduce){ *{ animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; } }
a{ color:inherit; }
button{ font-family:inherit; cursor:pointer; }
input, textarea{ font-family:inherit; }
:focus-visible{ outline:3px solid var(--ink); outline-offset:3px; }

/* ---------- NAV ---------- */
.nav{ position:sticky; top:0; z-index:40; display:flex; align-items:center; justify-content:space-between; padding:14px 5vw; background:color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter:blur(10px); border-bottom:1px solid var(--line); }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--serif); font-size:1.3rem; font-weight:600; letter-spacing:-0.01em; cursor:pointer; }
.brand-logo{ width:30px; height:30px; object-fit:contain; display:block; }
html[data-theme="dark"] .brand-logo{ filter:invert(1); }
.nav-links{ display:flex; gap:26px; font-size:0.95rem; font-weight:500; }
.nav-links a{ text-decoration:none; opacity:0.7; transition:opacity .15s; }
.nav-links a:hover{ opacity:1; }
.nav-right{ display:flex; align-items:center; gap:10px; position:relative; }

.account-pill{ display:flex; align-items:center; gap:8px; background:var(--bg-soft); border:1.5px solid var(--line); padding:5px 14px 5px 5px; border-radius:999px; font-size:0.85rem; font-weight:700; }
.account-avatar{ width:26px; height:26px; border-radius:50%; background:var(--accent); color:var(--bg); display:flex; align-items:center; justify-content:center; font-size:0.78rem; font-weight:800; }
.login-link-btn{ background:transparent; border:1.5px solid var(--line); color:var(--ink); border-radius:999px; padding:8px 16px; font-size:0.85rem; font-weight:700; }
.signin-btn{ background:var(--ink); color:var(--bg); border:none; border-radius:999px; padding:9px 18px; font-size:0.85rem; font-weight:700; }
.theme-toggle{ display:flex; align-items:center; border:1.5px solid var(--line); border-radius:999px; padding:4px; gap:2px; background:var(--bg-soft); }
.theme-toggle button{ border:none; background:transparent; width:30px; height:30px; border-radius:999px; display:flex; align-items:center; justify-content:center; color:var(--gray); transition:background .15s ease, color .15s ease; }
.theme-toggle button.on{ background:var(--ink); color:var(--bg); }
.theme-toggle svg{ width:15px; height:15px; }
.hamburger{ display:none; border:1.5px solid var(--line); background:var(--bg-soft); border-radius:8px; width:36px; height:36px; align-items:center; justify-content:center; }
.hamburger svg{ width:18px; height:18px; }
.mobile-menu{ display:none; }

/* ---------- SCREENS ---------- */
.screen{ display:none; }
.screen.active{ display:block; }

.tagline-strip{ text-align:center; padding:10px 5vw 0; min-height:24px; }
.tagline-strip span{ font-size:0.85rem; color:var(--gray); font-style:italic; transition:opacity .4s ease; }

/* ---------- HERO ---------- */
.hero{ display:grid; grid-template-columns:1.1fr 0.9fr; gap:36px; align-items:center; padding:26px 5vw 16px; max-width:1280px; margin:0 auto; }
.hero h1{ font-family:var(--serif); font-weight:600; font-size:clamp(2.2rem, 4.6vw, 3.7rem); line-height:1.05; letter-spacing:-0.015em; margin:0 0 20px; }
.hero h1 em{ font-style:italic; }
.hero p.lede{ font-size:1.12rem; line-height:1.6; color:var(--gray); max-width:46ch; margin:0 0 26px; }
.hero-ctas{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom:24px; }
.btn{ border:1.5px solid var(--ink); border-radius:10px; padding:14px 24px; font-size:0.96rem; font-weight:700; transition:transform .15s ease, opacity .15s ease; }
.btn-primary{ background:var(--ink); color:var(--bg); }
.btn-primary:hover{ transform:translateY(-2px); }
.btn-primary:disabled{ opacity:0.35; transform:none; cursor:not-allowed; }
.btn-ghost{ background:transparent; color:var(--ink); }
.btn-ghost:hover{ background:var(--bg-soft); }
.btn-block{ width:100%; text-align:center; }
.btn-sm{ padding:9px 16px; font-size:0.85rem; border-radius:8px; }

.stat-strip{ display:flex; gap:26px; flex-wrap:wrap; }
.stat-strip div{ border-left:2px solid var(--accent); padding-left:12px; }
.stat-strip .num{ font-family:var(--serif); font-size:1.5rem; font-weight:600; display:block; }
.stat-strip .lbl{ font-size:0.78rem; color:var(--gray); }

/* ---------- 3D CRESCENT + STAR EMBLEM ---------- */
.emblem-stage{ perspective:1200px; height:320px; display:flex; align-items:center; justify-content:center; }
.emblem{ position:relative; width:150px; height:150px; transform-style:preserve-3d; animation:spin 18s linear infinite; }
.emblem:hover{ animation-play-state:paused; }
@keyframes spin{ from{ transform:rotateY(0deg) rotateX(10deg); } to{ transform:rotateY(360deg) rotateX(10deg); } }
.medal{ position:absolute; top:0; left:0; width:150px; height:150px; border-radius:50%; display:flex; align-items:center; justify-content:center; background:var(--ink); border:1px solid var(--line); backface-visibility:hidden; }
.medal svg{ width:76%; height:76%; }
.medal:nth-child(1){ transform:rotateY(0deg) translateZ(102px); }
.medal:nth-child(2){ transform:rotateY(72deg) translateZ(102px); }
.medal:nth-child(3){ transform:rotateY(144deg) translateZ(102px); }
.medal:nth-child(4){ transform:rotateY(216deg) translateZ(102px); }
.medal:nth-child(5){ transform:rotateY(288deg) translateZ(102px); }
.emblem-glow{ position:absolute; bottom:-38px; left:50%; width:190px; height:50px; background:radial-gradient(ellipse at center, color-mix(in srgb, var(--ink) 18%, transparent), transparent 70%); transform:translateX(-50%); filter:blur(4px); }
.emblem-caption{ text-align:center; font-size:0.8rem; color:var(--gray); margin-top:18px; }

/* ---------- HOW IT WORKS ---------- */
.how{ max-width:900px; margin:0 auto; padding:44px 5vw 40px; display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.how-step{ border-top:2px solid var(--ink); padding-top:14px; }
.how-step .num{ font-family:var(--serif); font-size:1.5rem; font-weight:600; }
.how-step p{ margin:6px 0 0; font-size:0.9rem; color:var(--gray); line-height:1.5; }

/* ---------- PROVERB + WORD OF DAY ---------- */
.proverb{ max-width:720px; margin:0 auto; padding:10px 5vw 50px; text-align:center; }
.proverb blockquote{ margin:0; font-family:var(--serif); font-style:italic; font-size:1.4rem; line-height:1.5; }
.proverb cite{ display:block; margin-top:12px; font-style:normal; font-size:0.85rem; color:var(--gray); }

.wotd{ max-width:280px; margin:0 auto 40px; text-align:center; padding:18px 20px; border:1.5px solid var(--line); border-radius:14px; display:none; }
.wotd-label{ font-size:0.72rem; text-transform:uppercase; letter-spacing:0.08em; color:var(--gray); }
.wotd-tk{ font-family:var(--serif); font-size:1.5rem; font-weight:600; margin-top:6px; }
.wotd-en{ font-size:0.85rem; color:var(--gray); margin-top:2px; }

.guest-banner{ max-width:900px; margin:0 auto 30px; padding:14px 20px; border:1.5px dashed var(--line); border-radius:12px; display:none; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap; font-size:0.9rem; }
.guest-banner.show{ display:flex; }

/* ---------- PROFILE CARD ---------- */
.profile-card{ max-width:900px; margin:0 auto 50px; padding:26px 5vw; border-top:3px solid var(--accent); background:var(--bg-soft); border-radius:var(--radius); display:none; }
.profile-card.show{ display:block; }
.profile-top{ display:flex; align-items:center; gap:16px; flex-wrap:wrap; justify-content:space-between; }
.profile-id{ display:flex; align-items:center; gap:14px; }
.profile-avatar-lg{ width:56px; height:56px; border-radius:50%; background:var(--accent); color:var(--bg); display:flex; align-items:center; justify-content:center; font-family:var(--serif); font-size:1.4rem; font-weight:700; flex:none; }
.profile-name{ font-family:var(--serif); font-size:1.3rem; font-weight:600; }
.profile-bio{ font-size:0.9rem; color:var(--gray); margin-top:2px; max-width:44ch; }
.profile-actions{ display:flex; gap:8px; }
.badges-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:12px; margin-top:22px; }
.badge{ border:1.5px solid var(--line); border-radius:12px; padding:12px 14px; background:var(--bg); opacity:0.4; }
.badge.earned{ opacity:1; border-color:var(--accent); }
.badge .blabel{ font-weight:700; font-size:0.9rem; }
.badge .bdesc{ font-size:0.76rem; color:var(--gray); margin-top:2px; }
.my-rank-note{ font-size:0.82rem; color:var(--gray); margin-top:14px; }
.my-rank-note a{ font-weight:700; text-decoration:underline; cursor:pointer; }

/* ---------- LEVEL PATH ---------- */
.path-section{ padding:10px 5vw 100px; max-width:900px; margin:0 auto; position:relative; }
.path-section h2{ font-family:var(--serif); font-size:1.9rem; font-weight:600; text-align:center; margin:0 0 6px; }
.path-section .sub{ text-align:center; color:var(--gray); margin:0 0 46px; }

.chapter-header{ text-align:center; margin:0 0 30px; }
.chapter-header .ctitle{ font-family:var(--serif); font-size:1.15rem; font-weight:600; }
.chapter-header .cdesc{ font-size:0.82rem; color:var(--gray); margin-top:2px; }

.path{ position:relative; padding:10px 0; transition:filter .3s ease; }
.path.blurred{ filter:blur(6px); pointer-events:none; user-select:none; }
.path::before{ content:""; position:absolute; left:50%; top:0; bottom:0; width:2px; background:repeating-linear-gradient(to bottom, var(--line) 0 8px, transparent 8px 16px); transform:translateX(-50%); }
.level-node{ position:relative; display:flex; align-items:center; gap:22px; margin:0 0 40px; width:52%; animation:nodeIn .5s ease both; }
@keyframes nodeIn{ from{ opacity:0; transform:translateY(14px); } to{ opacity:1; transform:translateY(0); } }
.level-node:nth-child(odd){ margin-left:0; flex-direction:row; }
.level-node:nth-child(even){ margin-left:48%; flex-direction:row-reverse; text-align:right; }
.level-badge{ flex:none; width:58px; height:58px; border-radius:16px; display:flex; align-items:center; justify-content:center; font-family:var(--serif); font-size:1.3rem; font-weight:600; background:var(--bg); border:2px solid var(--ink); color:var(--ink); position:relative; z-index:2; box-shadow:var(--shadow); }
.level-node.unlocked .level-badge, .level-node.done .level-badge{ background:var(--accent); color:var(--bg); border-color:var(--accent); }
.level-node.locked .level-badge{ opacity:0.4; border-color:var(--line); }
.level-node button.level-card{ background:var(--bg); border:1px solid var(--line); border-radius:var(--radius); padding:14px 18px; text-align:left; flex:1; box-shadow:0 6px 18px rgba(0,0,0,0.05); transition:transform .15s ease, box-shadow .15s ease; }
.level-node:nth-child(even) button.level-card{ text-align:right; }
.level-node.unlocked button.level-card, .level-node.done button.level-card{ cursor:pointer; }
.level-node.unlocked button.level-card:hover, .level-node.done button.level-card:hover{ transform:translateY(-3px); box-shadow:0 14px 26px rgba(0,0,0,0.12); }
.level-node.locked button.level-card{ cursor:not-allowed; background:var(--bg-soft); }
.level-node.locked .ltitle{ color:var(--gray); }
.level-node.locked .lmeta{ opacity:0.8; }
.level-node.readonly button.level-card{ cursor:default; }
.level-node.readonly button.level-card:hover{ transform:none; box-shadow:0 6px 18px rgba(0,0,0,0.05); }
.level-card .ltitle{ font-weight:700; font-size:1.02rem; margin:0 0 4px; }
.level-card .lmeta{ font-size:0.83rem; color:var(--gray); }
.level-card .lscore{ font-size:0.78rem; font-weight:700; margin-top:6px; color:var(--accent); }

.gate-overlay{ position:absolute; inset:0; display:none; flex-direction:column; align-items:center; justify-content:center; text-align:center; gap:14px; padding:20px; }
.gate-overlay.show{ display:flex; }
.gate-overlay .lockicon{ width:38px; height:38px; }
.gate-overlay p{ max-width:32ch; color:var(--gray); font-size:0.95rem; margin:0; }

/* ---------- AUTH ---------- */
.auth-wrap{ max-width:420px; margin:0 auto; padding:60px 5vw 100px; }
.auth-wrap h2{ font-family:var(--serif); font-size:1.9rem; font-weight:600; margin:0 0 8px; text-align:center; }
.auth-wrap .sub{ text-align:center; color:var(--gray); font-size:0.95rem; margin:0 0 28px; }
.auth-tabs{ display:flex; border:1.5px solid var(--line); border-radius:12px; padding:4px; margin-bottom:24px; }
.auth-tabs button{ flex:1; border:none; background:transparent; padding:10px; border-radius:9px; font-weight:700; font-size:0.9rem; color:var(--gray); }
.auth-tabs button.on{ background:var(--ink); color:var(--bg); }
.field{ margin-bottom:15px; }
.field label{ display:block; font-size:0.8rem; font-weight:700; margin-bottom:6px; }
.field input, .field textarea{ width:100%; padding:12px 14px; border-radius:10px; border:1.5px solid var(--line); background:var(--bg); color:var(--ink); font-size:0.98rem; }
.field textarea{ resize:vertical; min-height:70px; }
.field input:focus, .field textarea:focus{ border-color:var(--ink); }
.field .helper{ font-size:0.74rem; color:var(--gray); margin-top:5px; }
.auth-error{ background:var(--bg-soft); border:1.5px solid var(--ink); border-radius:10px; padding:10px 14px; font-size:0.85rem; margin-bottom:16px; display:none; }
.auth-error.show{ display:block; }
.remember-row{ display:flex; align-items:center; gap:8px; font-size:0.85rem; margin:14px 0 18px; }

/* ---------- SECURITY MODAL ---------- */
.modal-overlay{ position:fixed; inset:0; background:rgba(0,0,0,0.5); display:none; align-items:center; justify-content:center; z-index:100; padding:20px; }
.modal-overlay.show{ display:flex; }
.modal-box{ background:var(--bg); border-radius:16px; padding:30px; max-width:400px; width:100%; box-shadow:var(--shadow); }
.modal-box h3{ font-family:var(--serif); font-size:1.3rem; margin:0 0 6px; }
.modal-box .qtext{ font-size:0.95rem; font-weight:700; margin:14px 0 10px; }
.modal-actions{ display:flex; gap:10px; margin-top:18px; }
.modal-actions .btn{ flex:1; }

/* ---------- CUSTOMIZE SCREEN ---------- */
.customize-wrap{ max-width:480px; margin:0 auto; padding:60px 5vw 100px; }
.customize-wrap h2{ font-family:var(--serif); font-size:1.8rem; font-weight:600; margin:0 0 26px; }
.swatches{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom:24px; }
.swatch{ width:38px; height:38px; border-radius:50%; border:2px solid transparent; position:relative; }
.swatch.selected{ border-color:var(--ink); }
.swatch.selected::after{ content:"✓"; position:absolute; inset:0; display:flex; align-items:center; justify-content:center; color:#fff; font-weight:800; font-size:0.9rem; text-shadow:0 0 2px rgba(0,0,0,0.6); }

/* ---------- STUDY / QUIZ ---------- */
.quiz-wrap{ max-width:640px; margin:0 auto; padding:50px 5vw 100px; }
.quiz-top{ display:flex; align-items:center; justify-content:space-between; margin-bottom:8px; }
.quiz-top .back{ background:none; border:none; font-weight:700; color:var(--ink); font-size:0.95rem; }
.quiz-top .counter{ font-size:0.9rem; color:var(--gray); font-weight:600; }
.progress-track{ height:6px; background:var(--line); border-radius:99px; margin:14px 0 10px; overflow:hidden; }
.progress-fill{ height:100%; background:var(--accent); border-radius:99px; transition:width .3s ease; }
.mode-label{ text-align:center; font-size:0.8rem; text-transform:uppercase; letter-spacing:0.08em; color:var(--gray); margin-bottom:30px; }

.card-stage{ perspective:1400px; }
.flashcard{ position:relative; width:100%; height:270px; transform-style:preserve-3d; transition:transform .55s cubic-bezier(.2,.8,.2,1); cursor:pointer; }
.flashcard.flipped{ transform:rotateY(180deg); }
.face{ position:absolute; inset:0; backface-visibility:hidden; border-radius:20px; display:flex; flex-direction:column; align-items:center; justify-content:center; padding:28px; text-align:center; box-shadow:var(--shadow); border:2px solid var(--ink); }
.face-front{ background:var(--ink); color:var(--bg); }
.face-front .tk{ font-family:var(--serif); font-size:2.1rem; font-weight:600; }
.face-front .hint{ margin-top:14px; font-size:0.85rem; opacity:0.65; }
.face-back{ background:var(--bg); color:var(--ink); transform:rotateY(180deg); }
.face-back .en{ font-family:var(--serif); font-size:1.6rem; font-weight:600; }
.face-back .hint{ margin-top:14px; font-size:0.85rem; color:var(--gray); }

.study-nav{ display:flex; justify-content:space-between; align-items:center; margin-top:26px; }
.dots{ display:flex; gap:6px; flex-wrap:wrap; max-width:160px; justify-content:center; }
.dot{ width:7px; height:7px; border-radius:50%; background:var(--line); }
.dot.on{ background:var(--accent); }

.mc-prompt{ text-align:center; margin-bottom:28px; }
.mc-prompt .tk-big{ font-family:var(--serif); font-size:2.3rem; font-weight:600; }
.mc-prompt .instr{ font-size:0.9rem; color:var(--gray); margin-top:8px; }
.mc-options{ display:grid; gap:12px; }
.mc-option{ border:1.5px solid var(--line); border-radius:12px; padding:15px 18px; background:var(--bg); color:var(--ink); text-align:left; font-size:1rem; font-weight:600; transition:transform .1s ease, border-color .15s ease; }
.mc-option:hover:not(:disabled){ border-color:var(--ink); }
.mc-option.correct{ background:var(--accent); color:var(--bg); border-color:var(--accent); }
.mc-option.incorrect{ border-color:var(--ink); text-decoration:line-through; opacity:0.5; }
.mc-option:disabled{ cursor:default; }

.quiz-actions{ display:flex; justify-content:center; margin-top:26px; }
.quiz-actions .btn{ min-width:160px; }

/* ---------- RESULTS ---------- */
.results{ max-width:520px; margin:70px auto; padding:0 5vw; text-align:center; }
.results .score-big{ font-family:var(--serif); font-size:4.2rem; font-weight:600; }
.results p{ color:var(--gray); font-size:1.03rem; }
.results .btn-row{ display:flex; gap:14px; justify-content:center; margin-top:28px; flex-wrap:wrap; }

/* ---------- LEADERBOARD ---------- */
.leaderboard-wrap{ max-width:640px; margin:0 auto; padding:50px 5vw 100px; }
.leaderboard-wrap h2{ font-family:var(--serif); font-size:1.9rem; font-weight:600; margin:26px 0 6px; }
.leaderboard-wrap .sub{ color:var(--gray); font-size:0.92rem; margin:0 0 30px; }
.lb-row{ display:flex; align-items:center; gap:14px; padding:14px 16px; border:1.5px solid var(--line); border-radius:12px; margin-bottom:10px; background:var(--bg); }
.lb-row.me{ border-color:var(--accent); background:var(--bg-soft); }
.lb-rank{ font-family:var(--serif); font-size:1.2rem; font-weight:700; width:32px; text-align:center; flex:none; color:var(--gray); }
.lb-row:nth-child(1) .lb-rank, .lb-row:nth-child(2) .lb-rank, .lb-row:nth-child(3) .lb-rank{ color:var(--ink); }
.lb-avatar{ width:38px; height:38px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-family:var(--serif); font-weight:700; color:var(--bg); flex:none; }
.lb-name{ flex:1; min-width:0; }
.lb-uname{ font-weight:700; font-size:0.95rem; }
.lb-bio{ font-size:0.78rem; color:var(--gray); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.lb-stats{ text-align:right; flex:none; }
.lb-words{ font-weight:700; font-size:0.95rem; }
.lb-levels{ font-size:0.76rem; color:var(--gray); }
.lb-empty{ text-align:center; padding:40px 20px; color:var(--gray); }
.lb-empty .btn{ margin-top:16px; }
.lb-scope-note{ text-align:center; font-size:0.78rem; color:var(--gray); margin-top:26px; }

/* ---------- CONFETTI ---------- */
.confetti-layer{ position:fixed; inset:0; pointer-events:none; z-index:200; overflow:hidden; }
.confetti-piece{ position:absolute; top:-20px; width:8px; height:14px; opacity:0.9; animation:confetti-fall 1.5s ease-in forwards; }
@keyframes confetti-fall{ to{ transform:translateY(105vh) rotate(360deg); opacity:0; } }

footer{ padding:32px 5vw 46px; text-align:center; color:var(--gray); font-size:0.83rem; max-width:640px; margin:0 auto; line-height:1.6; }

@media (max-width:760px){
  .hero{ grid-template-columns:1fr; padding-top:20px; }
  .emblem-stage{ height:220px; }
  .how{ grid-template-columns:1fr; }
  .path::before{ left:22px; }
  .level-node, .level-node:nth-child(even){ width:100%; margin-left:0; flex-direction:row; text-align:left; }
  .level-node:nth-child(even) button.level-card{ text-align:left; }
  .level-badge{ width:50px; height:50px; font-size:1.15rem; }
  .nav-links{ display:none; }
  .hamburger{ display:flex; }
  .mobile-menu.open{ display:flex; flex-direction:column; gap:14px; position:absolute; top:100%; left:0; right:0; background:var(--bg); border-bottom:1px solid var(--line); padding:16px 5vw; font-weight:600; }
  .profile-top{ flex-direction:column; align-items:flex-start; }
}