/* ============================================================
   English Space — app.css
   ============================================================ */
:root{
  /* Bảng màu XANH LÁ dịu mắt, nền sáng thân thiện */
  --bg:#f1f7f2; --bg-soft:#e6f0e8; --card:#ffffff; --card-2:#eaf4ec;
  --line:#d5e6d9; --text:#1e2f26; --muted:#5c7268;
  --primary:#188a4f; --primary-2:#26a862; --accent:#0c7d5b; --accent-2:#1f9d5e;
  --danger:#e5484d; --warn:#d98a1f; --good:#188a4f;
  --radius:16px; --radius-sm:10px; --shadow:0 6px 20px rgba(20,83,45,.10);
  --maxw:1080px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(38,168,98,.10),transparent),
             radial-gradient(900px 500px at -10% 10%,rgba(12,125,91,.08),transparent),
             var(--bg);
  color:var(--text); line-height:1.6; min-height:100vh;
  display:flex; flex-direction:column;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.page{flex:1;padding-top:28px;padding-bottom:56px}
.muted{color:var(--muted)}
h1,h2,h3{line-height:1.25;margin:.2em 0 .5em}
h1{font-size:1.9rem}
.lang-en{color:var(--muted);font-weight:400}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:.85rem;letter-spacing:.5px}
.brand-text span{color:var(--accent)}
.nav-wrap{display:flex;align-items:center;gap:8px;margin-left:auto;min-width:0}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{display:flex;flex-direction:column;line-height:1.1;padding:8px 14px;border-radius:10px;color:var(--text)}
.main-nav a:hover{background:var(--card-2);text-decoration:none}
.main-nav a.active{background:rgba(24,138,79,.12)}
.main-nav a .nav-en{font-size:.7rem;color:var(--muted)}
.main-nav a.active .nav-en{color:var(--accent)}
.user-box{display:flex;align-items:center;gap:10px;padding-left:14px;margin-left:6px;border-left:1px solid var(--line)}
.user-name{font-size:.9rem;color:var(--muted);max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-toggle{display:none;background:none;border:0;color:var(--text);font-size:1.5rem;cursor:pointer;margin-left:auto}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;
  border:1px solid transparent;border-radius:12px;padding:11px 20px;font-weight:600;font-size:.95rem;
  transition:.15s;text-decoration:none;font-family:inherit}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-sm{padding:7px 14px;font-size:.85rem;border-radius:10px}
.btn-lg{padding:14px 28px;font-size:1.05rem}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 6px 18px rgba(24,138,79,.28)}
.btn-accent{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{background:var(--card-2)}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-danger{background:var(--danger);color:#fff}
.btn-good{background:var(--good);color:#fff}
.btn-warn{background:var(--warn);color:#3a2a00}

/* ---------- Cards & layout ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.stack>*+*{margin-top:16px}
.center{text-align:center}
.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:.72rem;font-weight:700;
  background:var(--card-2);color:var(--accent);border:1px solid var(--line)}
.badge.cefr{background:rgba(24,138,79,.12);color:var(--primary)}
.pill-row{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- Hero ---------- */
.hero{text-align:center;padding:48px 20px 8px}
.hero h1{font-size:2.6rem;margin-bottom:.1em}
.hero .sub{font-size:1.15rem;color:var(--muted);max-width:620px;margin:0 auto 24px}
.hero .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ---------- Stat tiles ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px}
.stat .n{font-size:1.8rem;font-weight:800}
.stat .l{font-size:.82rem;color:var(--muted)}
.stat .n.accent{color:var(--accent)}
.stat .n.good{color:var(--good)}
.stat .n.warn{color:var(--warn)}

/* ---------- Progress ---------- */
.progress{height:10px;background:var(--bg-soft);border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.progress>i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:999px;transition:width .4s}

/* ---------- Feature/module cards ---------- */
.mods{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.mod{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;color:var(--text)}
.mod:hover{text-decoration:none;border-color:var(--primary);transform:translateY(-2px);transition:.2s}
.mod .ic{font-size:2rem}
.mod h3{margin:.4em 0 .2em}
.mod p{color:var(--muted);margin:0}

/* ---------- Roadmap ---------- */
.stage{margin-bottom:22px}
.stage-head{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.stage-num{width:34px;height:34px;flex:none;display:grid;place-items:center;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-weight:800}
.stage h3{margin:0}
.checklist{list-style:none;margin:12px 0 0;padding:0}
.checklist li{display:flex;align-items:flex-start;gap:12px;padding:10px 12px;border-radius:10px;cursor:pointer}
.checklist li:hover{background:var(--card-2)}
.checklist input{margin-top:4px;width:18px;height:18px;accent-color:var(--accent);cursor:pointer}
.checklist li.done label{color:var(--muted);text-decoration:line-through}
.checklist .en{display:block;font-size:.82rem;color:var(--muted)}

/* ---------- Flashcard ---------- */
.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(240px,100%),1fr));gap:16px}
.deck{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;color:var(--text);display:block}
.deck:hover{text-decoration:none;border-color:var(--accent)}
.deck .top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.deck h3{margin:0 0 2px}
.deck .due{font-weight:700}
.deck .due.has{color:var(--warn)}

.flash-stage{max-width:560px;margin:0 auto}
.flashcard{perspective:1400px;margin:20px 0}
.fc-inner{position:relative;min-height:280px;transition:transform .5s;transform-style:preserve-3d;cursor:pointer}
.flashcard.flipped .fc-inner{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;padding:28px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow)}
.fc-back{transform:rotateY(180deg);background:var(--card-2)}
.fc-term{font-size:2rem;font-weight:800}
.fc-ipa{color:var(--accent);font-size:1.05rem;margin-top:6px}
.fc-pos{margin-top:8px}
.fc-mean{font-size:1.5rem;font-weight:700;margin-bottom:8px}
.fc-ex{color:var(--muted);font-style:italic;margin-top:10px}
.fc-ex b{color:var(--text);font-style:normal}
.fc-hint{position:absolute;bottom:12px;left:0;right:0;text-align:center;font-size:.75rem;color:var(--muted)}
.grade-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}
.grade-row .btn{flex-direction:column;gap:0;padding:10px 4px}
.grade-row .btn small{font-size:.68rem;font-weight:400;opacity:.85}
.speak-btn{background:none;border:1px solid var(--line);color:var(--accent);border-radius:50%;width:44px;height:44px;
  font-size:1.2rem;cursor:pointer;margin-top:10px}
.speak-btn:hover{background:var(--card-2)}
/* Chế độ học Flashcard: Đoán từ trong câu / Xem từ */
.fc-mode{display:flex;align-items:center;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.fc-mode .btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.fc-gap-mode{width:100%}
.fc-gap-sentence{font-size:1.35rem;line-height:1.7;font-weight:600;text-align:center;padding:0 6px}
.fc-gapfill{color:var(--primary);font-weight:800;letter-spacing:1px;border-bottom:3px solid var(--accent);padding:0 4px}
.fc-gap-hint{margin-top:16px;color:var(--muted);font-size:1rem}

/* ---------- Practice (speaking/listening) ---------- */
.practice{max-width:640px;margin:0 auto}
.prompt-card{text-align:center;padding:32px 24px}
.prompt-en{font-size:1.7rem;font-weight:700;margin-bottom:8px}
.prompt-vi{color:var(--muted)}
.mic-big{width:88px;height:88px;border-radius:50%;border:0;cursor:pointer;font-size:2rem;
  background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 8px 24px rgba(24,138,79,.35);margin:8px}
.mic-big.rec{animation:pulse 1.1s infinite;background:linear-gradient(135deg,var(--danger),#fb7185)}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(248,113,113,.5)}70%{box-shadow:0 0 0 22px rgba(248,113,113,0)}100%{box-shadow:0 0 0 0 rgba(248,113,113,0)}}
.result-box{margin-top:16px;padding:16px;border-radius:12px;background:var(--card-2);border:1px solid var(--line)}
.score-big{font-size:2.4rem;font-weight:800}
.heard{font-size:1.1rem;margin-top:6px}
.tok-ok{color:var(--good);font-weight:700}
.tok-bad{color:var(--danger);text-decoration:underline;text-decoration-style:wavy}
.dict-input{width:100%;font-size:1.2rem;padding:14px;border-radius:12px;background:var(--bg-soft);
  border:1px solid var(--line);color:var(--text);font-family:inherit;text-align:center}
.dict-input:focus{outline:none;border-color:var(--accent)}
.speed-row{display:flex;gap:8px;justify-content:center;align-items:center;margin:10px 0}

/* ---------- Forms / Auth ---------- */
.auth-wrap{max-width:420px;margin:40px auto}
.field{margin-bottom:16px}
.field label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:6px}
.field input{width:100%;padding:12px 14px;border-radius:12px;background:var(--bg-soft);
  border:1px solid var(--line);color:var(--text);font-size:1rem;font-family:inherit}
.field input:focus{outline:none;border-color:var(--primary)}
.auth-alt{text-align:center;margin-top:16px;color:var(--muted)}
.google-btn{background:#fff;color:#1f2340;border:1px solid #dadce0;gap:12px;margin-top:20px}
.google-btn:hover{background:#f4f6fb;text-decoration:none;color:#1f2340}
.google-btn svg{flex:none}

/* ---------- Flash messages ---------- */
.flash{margin:14px 0;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--card)}
.flash-error{border-color:var(--danger);background:rgba(248,113,113,.12)}
.flash-success{border-color:var(--good);background:rgba(52,211,153,.12)}
.flash-info{border-color:var(--accent);background:rgba(12,125,91,.10)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:26px 0;margin-top:auto;color:var(--muted);font-size:.9rem}
.site-footer p{margin:2px 0}

.section-title{display:flex;align-items:baseline;gap:12px;margin:26px 0 14px}
.section-title h2{margin:0}
.empty{text-align:center;padding:40px;color:var(--muted)}

/* ---------- Responsive ---------- */
@media(max-width:820px){
  .grid-2,.grid-3,.grid-4,.mods{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nav-toggle{display:block}
  .nav-wrap{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;
    gap:4px;margin-left:0;background:var(--card);border-bottom:1px solid var(--line);
    box-shadow:0 12px 24px rgba(20,83,45,.12);padding:12px 16px}
  body.nav-open .nav-wrap{display:flex}
  .main-nav{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .main-nav a{flex-direction:row;gap:10px;padding:11px 12px}
  .user-box{display:flex;justify-content:space-between;align-items:center;width:100%;
    border-left:0;padding:10px 0 0;margin:6px 0 0;border-top:1px solid var(--line)}
  .user-name{max-width:none}
  .hero h1{font-size:2rem}
}

/* ================= Module Ngữ pháp (additive) ================= */
.g-lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(300px,100%),1fr));gap:16px}
.g-lesson{display:flex;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;color:var(--text)}
.g-lesson:hover{text-decoration:none;border-color:var(--primary);transform:translateY(-2px);transition:.2s}
.g-lesson-no{flex:none;width:40px;height:40px;display:grid;place-items:center;border-radius:12px;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--primary),var(--accent))}
.g-lesson-body{min-width:0}
.g-lesson-body .top{display:flex;gap:8px;margin-bottom:6px}
.g-lesson-body h3{margin:0}
.g-pat{font-style:italic}
.g-pattern code,.g-pat{color:var(--accent)}
.g-pattern code{background:var(--bg-soft);padding:4px 10px;border-radius:8px;font-size:.9rem}

.g-examples{list-style:none;margin:0;padding:0}
.g-examples li{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line)}
.g-examples li:last-child{border-bottom:0}
.g-examples .speak-btn{width:38px;height:38px;font-size:1rem;flex:none;margin:0}
.g-en{font-size:1.1rem;font-weight:600}
.g-vi{font-size:.9rem}

.g-ex{margin-top:14px}
.g-ex-prompt{font-weight:600;margin-bottom:12px}
.g-ex-num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--card-2);color:var(--accent);font-size:.85rem;margin-right:6px}
.g-sentence{font-size:1.3rem;margin:6px 0 14px;text-align:center}
.g-blank{display:inline-block;min-width:70px;border-bottom:2px dashed var(--accent);color:var(--muted);text-align:center}
.g-blank.filled{color:var(--good);border-bottom-style:solid;font-weight:700}
.g-opts{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.g-opt.g-ok{background:var(--good);color:#fff;border-color:var(--good)}
.g-opt.g-bad{background:var(--danger);color:#fff;border-color:var(--danger)}
.g-cue{margin-bottom:10px}
.g-build{min-height:52px;border:1px dashed var(--line);border-radius:12px;padding:12px;margin-bottom:12px;background:var(--bg-soft);font-size:1.2rem}
.g-build:empty::before{content:attr(data-empty);color:var(--muted);font-size:.95rem}
.g-tok{display:inline-block;background:var(--card-2);border:1px solid var(--line);border-radius:8px;padding:4px 10px;margin:2px}
.g-pool{display:flex;flex-wrap:wrap;gap:8px}
.g-chip{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;border:0;border-radius:10px;padding:8px 14px;font-size:1rem;cursor:pointer;font-family:inherit}
.g-chip.used{opacity:.3;cursor:default}
.g-ex-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:12px}
.g-feedback{margin-top:12px;padding:12px 14px;border-radius:10px;font-size:.95rem}
.g-fb-ok{background:rgba(52,211,153,.14);border:1px solid var(--good)}
.g-fb-bad{background:rgba(248,113,113,.12);border:1px solid var(--danger)}
.g-feedback .speak-btn{width:34px;height:34px;font-size:.95rem;margin:0 0 0 6px;vertical-align:middle}
/* Chú thích màu thành phần câu (module Ngữ pháp) */
.g-legend{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;margin-top:12px;font-size:.85rem}
.g-legend-item{display:inline-flex;align-items:center;gap:5px}
.g-dot{width:12px;height:12px;border-radius:50%;display:inline-block;flex:none}
/* Bảng ví dụ theo thành phần câu (module Ngữ pháp) */
.g-table{width:100%;border-collapse:collapse;font-size:.98rem}
.g-table th,.g-table td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.g-table thead th{font-size:.78rem;text-transform:uppercase;letter-spacing:.3px;font-weight:800;
  border-bottom:2px solid var(--line);white-space:nowrap;position:sticky;top:0;background:var(--card)}
.g-table tbody tr:hover{background:var(--card-2)}
.g-table td:first-child,.g-table th:first-child{width:44px;padding-left:6px;padding-right:6px}
.g-table .speak-btn{width:34px;height:34px;font-size:.9rem;margin:0}
.g-table .g-th-vi{color:var(--muted);font-weight:700}
.g-table .g-td-vi{font-size:.84rem;min-width:150px;font-weight:400}
.g-table .g-td-vi em{font-style:normal;color:var(--accent)}
/* Hộp giải thích sau khi trả lời (bài tập ngữ pháp) */
.g-teach{margin-top:12px;padding-top:10px;border-top:1px dashed var(--line);font-size:.9rem}
.g-teach-row{margin:5px 0}
.g-teach-row b{color:var(--accent)}
.g-teach-key{margin-top:9px;padding:9px 12px;border-radius:10px;background:rgba(24,138,79,.10);border:1px solid rgba(24,138,79,.25);font-weight:700}

/* ===== Thân thiện mọi thiết bị (tinh chỉnh) ===== */
.section-title{flex-wrap:wrap}
.g-sentence,.g-build,.g-en,.prompt-en,.fc-term,.fc-gap-sentence,.g-cue{overflow-wrap:break-word;word-break:break-word}
.g-table-wrap{-webkit-overflow-scrolling:touch}
@media(max-width:560px){
  .wrap{padding:0 14px}
  .card{padding:16px}
  h1{font-size:1.55rem}
  .section-title h1{font-size:1.4rem}
  .hero{padding:32px 12px 4px}
  .hero h1{font-size:1.7rem}
  .hero .sub{font-size:1rem}
  .header-inner{gap:10px}
  .brand-text{font-size:.98rem}
  .flashcard{margin:14px 0}
  .fc-inner{min-height:320px}
  .fc-face{padding:20px}
  .fc-term{font-size:1.7rem}
  .fc-gap-sentence{font-size:1.2rem}
  .g-sentence{font-size:1.15rem}
  .prompt-en{font-size:1.35rem}
  .grade-row{gap:6px}
  .grade-row .btn{padding:9px 2px;font-size:.92rem}
  .g-table{font-size:.9rem}
  .g-table th,.g-table td{padding:7px 8px}
  .g-table .g-td-vi{min-width:110px}
  .g-lesson{padding:14px}
  .mic-big{width:76px;height:76px;font-size:1.7rem}
  .btn-lg{padding:12px 20px;font-size:1rem}
  .deck-grid,.g-lesson-grid,.mods{gap:12px}
}