/* ============================================================
   JLPT Kanji Mastery — style.css
   ============================================================ */

/* ── Design Tokens ── */
:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --accent: #06b6d4;
    --success: #10b981;
    --danger:  #ef4444;
    --warn:    #f59e0b;

    --bg:      #f1f5f9;
    --surface: #ffffff;
    --surface2:#f8fafc;
    --text:    #0f172a;
    --text-sub:#475569;
    --text-muted: #94a3b8;
    --border:  #e2e8f0;

    --shadow-sm: 0 1px 3px rgba(0,0,0,.07);
    --shadow-md: 0 4px 14px rgba(0,0,0,.10);
    --shadow-lg: 0 8px 28px rgba(0,0,0,.13);

    --r-sm: 8px;
    --r-md: 14px;
    --r-lg: 20px;
    --r-xl: 28px;
}

.dark {
    --bg:      #0f172a;
    --surface: #1e293b;
    --surface2:#162032;
    --text:    #f1f5f9;
    --text-sub:#cbd5e1;
    --text-muted:#64748b;
    --border:  #334155;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Outfit', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100dvh;
    overflow-x: hidden;
    transition: background .25s, color .25s;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input  { font-family: inherit; border: none; outline: none; background: none; }
a      { color: inherit; text-decoration: none; }

/* ── Loading overlay ── */
#loading-overlay {
    position: fixed; inset: 0;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(6px);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    z-index: 9000;
    transition: opacity .3s;
}
.dark #loading-overlay { background: rgba(15,23,42,.88); }
#loading-overlay.hidden { opacity:0; pointer-events:none; }
.spinner {
    width: 42px; height: 42px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .85s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading-text { margin-top: 14px; font-weight: 600; color: var(--text-muted); font-size: .95rem; }

/* ── Translate Modal (bottom sheet) ── */
#modal-backdrop {
    position: fixed; inset: 0;
    background: rgba(0,0,0,.45);
    z-index: 800; opacity: 0; pointer-events: none;
    transition: opacity .25s;
}
#modal-backdrop.show { opacity: 1; pointer-events: auto; }
#modal-sheet {
    position: fixed; left: 0; right: 0; bottom: 0;
    background: var(--surface);
    border-radius: var(--r-xl) var(--r-xl) 0 0;
    padding: 24px 20px 32px;
    z-index: 801;
    transform: translateY(100%);
    transition: transform .3s cubic-bezier(.32,.72,0,1);
    box-shadow: 0 -4px 32px rgba(0,0,0,.14);
    max-height: 55vh; overflow-y: auto;
}
#modal-sheet.show { transform: translateY(0); }
.modal-handle { width: 40px; height: 4px; border-radius: 2px; background: var(--border); margin: 0 auto 20px; }
.modal-word-row { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 8px; }
#modal-word { font-size: 2rem; font-weight: 800; color: var(--primary); line-height: 1; }
#modal-reading { font-size: 1rem; color: var(--text-muted); margin-bottom: 10px; }
#modal-meaning { font-size: .95rem; line-height: 1.65; color: var(--text); }
.btn-modal-close {
    margin-top: 20px; width: 100%; padding: 13px;
    border-radius: var(--r-md);
    background: var(--primary); color: #fff;
    font-size: 1rem; font-weight: 700;
}

/* ── Header ── */
.app-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, var(--primary-light) 100%);
    color: #fff;
    padding: calc(14px + env(safe-area-inset-top)) 20px 28px;
    border-radius: 0 0 var(--r-xl) var(--r-xl);
    box-shadow: 0 4px 24px rgba(79,70,229,.35);
}
.header-top {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 18px;
}
.app-title    { font-size: 1.35rem; font-weight: 800; letter-spacing: -.4px; }
.app-subtitle { font-size: .78rem; opacity: .75; margin-top: 2px; }
.icon-btn {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    color: #fff; font-size: 1.1rem;
    display: flex; align-items: center; justify-content: center;
    transition: background .2s;
    flex-shrink: 0;
}
.icon-btn:hover { background: rgba(255,255,255,.28); }

/* Tab Navigation */
.tab-nav {
    display: flex; gap: 8px;
    overflow-x: auto; scrollbar-width: none;
    padding-bottom: 2px;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
    padding: 8px 16px;
    border-radius: 30px;
    background: rgba(255,255,255,.15);
    color: rgba(255,255,255,.9);
    font-size: .85rem; font-weight: 600;
    white-space: nowrap; flex-shrink: 0;
    transition: background .18s, color .18s;
}
.tab-btn.active { background: #fff; color: var(--primary); }

/* Level Pills */
.level-nav {
    display: flex; gap: 8px;
    overflow-x: auto; scrollbar-width: none;
    margin-top: 14px;
}
.level-nav::-webkit-scrollbar { display: none; }
.level-btn {
    padding: 5px 14px;
    border-radius: 20px;
    background: rgba(255,255,255,.14);
    color: rgba(255,255,255,.8);
    font-size: .8rem; font-weight: 700;
    white-space: nowrap; flex-shrink: 0;
    transition: all .18s;
}
.level-btn.active { background: #fff; color: var(--primary); }

/* ── Search Bar ── */
.search-wrap {
    padding: 0 16px;
    margin-top: 14px;
}
.search-inner {
    display: flex; align-items: center;
    background: var(--surface);
    border-radius: var(--r-md);
    box-shadow: var(--shadow-md);
    border: 2px solid transparent;
    transition: border-color .2s;
    overflow: hidden;
}
.search-inner:focus-within { border-color: var(--primary); }
#search-input {
    flex: 1; padding: 13px 16px;
    font-size: 1rem; color: var(--text);
}
#search-input::placeholder { color: var(--text-muted); }
#search-clear {
    padding: 0 14px; font-size: 1.1rem;
    color: var(--text-muted); display: none;
    transition: color .15s;
}
#search-clear:hover { color: var(--danger); }

/* ── Content Area ── */
.content { padding: 16px; padding-bottom: calc(24px + env(safe-area-inset-bottom)); }
.section { display: none; animation: fadeUp .28s ease; }
.section.active { display: block; }
@keyframes fadeUp { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }

/* ── Cards ── */
.card {
    background: var(--surface);
    border-radius: var(--r-lg);
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.card-label {
    font-size: .72rem; font-weight: 700; letter-spacing: .07em;
    text-transform: uppercase; color: var(--text-muted);
    margin-bottom: 14px;
}

/* ── Button System ── */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 11px 16px;
    border-radius: var(--r-sm);
    font-size: .9rem; font-weight: 700;
    border: 1.5px solid var(--border);
    background: var(--surface);
    color: var(--text);
    transition: all .15s;
    cursor: pointer;
}
.btn:active { transform: scale(.96); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-danger  { background: var(--danger);  color: #fff; border-color: var(--danger); }
.btn-icon    { padding: 11px 13px; }
.btn-full    { width: 100%; }
.btn-row     { display: flex; gap: 10px; margin-top: 14px; }
.btn-row .btn { flex: 1; }

/* ── Kanji Section ── */
.kanji-hero { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 10px 0 16px; }

/* Critical: exact size prevents SVG overflow/clipping */
#hw-target {
    width: 200px; height: 200px;
    position: relative;            /* HanziWriter needs positioned parent */
    margin: 0 auto 16px;
    border-radius: var(--r-md);
    background: var(--surface2);
    border: 1px solid var(--border);
    overflow: hidden;
}
#hw-target svg { display: block; } /* prevent inline-block gap */

.progress-chip {
    display: inline-flex; align-items: center; gap: 4px;
    background: var(--surface2); border: 1px solid var(--border);
    border-radius: 20px; padding: 4px 12px;
    font-size: .8rem; font-weight: 700; color: var(--text-muted);
    margin-bottom: 12px;
}
.kanji-meanings {
    font-size: 1.15rem; font-weight: 700;
    color: var(--primary); margin-bottom: 14px;
    min-height: 28px;
}
.readings-row { display: flex; gap: 24px; justify-content: center; }
.reading-block { text-align: center; }
.reading-label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text-muted); }
.reading-value { font-size: .95rem; font-weight: 700; margin-top: 3px; cursor: pointer; transition: color .15s; }
.reading-value:hover { color: var(--primary); }

/* ── Furigana ── */
ruby { ruby-align: center; }
rt   { font-size: .6em; font-weight: 400; color: var(--text-sub); user-select: none; }
.hide-furigana rt { display: none; }

/* ── Passage / Reading ── */
.passage {
    background: var(--surface2);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    padding: 14px 16px;
    font-size: 1.05rem; line-height: 2;
    cursor: text; user-select: text;
}
.translation-box {
    background: rgba(79,70,229,.05);
    border: 1px dashed var(--primary-light);
    border-radius: var(--r-sm);
    padding: 14px 16px;
    font-size: .93rem; line-height: 1.65;
    color: var(--text-sub);
    margin-top: 12px;
}
.grammar-list { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.grammar-item {
    font-size: .83rem; color: var(--text-sub);
    background: var(--surface2); border-radius: var(--r-sm);
    padding: 8px 12px; border-left: 3px solid var(--warn);
    line-height: 1.55;
}

/* Hover lookup tooltip */
.lookup-box {
    margin-top: 10px; padding: 12px 14px;
    background: var(--surface);
    border: 1px solid var(--primary-light);
    border-radius: var(--r-sm);
    font-size: .88rem; line-height: 1.5;
    color: var(--text);
    min-height: 44px;
    display: none;
}
.lookup-box.visible { display: block; animation: fadeUp .2s ease; }

/* ── News ── */
.news-item { padding: 16px 0; border-bottom: 1px solid var(--border); }
.news-item:last-child { border-bottom: none; }
.news-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.news-cat {
    display: inline-block; background: var(--primary); color: #fff;
    font-size: .68rem; font-weight: 700; padding: 2px 8px; border-radius: 10px;
}
.news-date { font-size: .73rem; color: var(--text-muted); }
.news-title { font-size: .98rem; font-weight: 700; margin-bottom: 8px; line-height: 1.45; }
.news-text  { font-size: .88rem; line-height: 1.78; color: var(--text-sub); }

/* ── Listening ── */
.listen-hero { text-align: center; padding: 8px 0 18px; }
.play-btn {
    width: 76px; height: 76px; border-radius: 50%;
    background: var(--primary); color: #fff; font-size: 1.9rem;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 14px;
    box-shadow: 0 4px 20px rgba(79,70,229,.4);
    transition: transform .12s;
}
.play-btn:active { transform: scale(.93); }
.audio-ctrl-row { display: flex; justify-content: center; gap: 14px; margin-bottom: 20px; }
.audio-ctrl {
    width: 46px; height: 46px; border-radius: 50%;
    background: var(--surface2); border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.05rem; transition: all .15s;
}
.audio-ctrl:active { transform: scale(.9); }
.audio-ctrl.stop  { background: var(--danger); color: #fff; border-color: var(--danger); }

.quiz-opts { display: flex; flex-direction: column; gap: 10px; }
.quiz-opt {
    padding: 13px 15px; border-radius: var(--r-sm);
    border: 1.5px solid var(--border); background: var(--surface);
    font-size: .93rem; font-weight: 500; text-align: left;
    transition: border-color .15s, background .15s;
    cursor: pointer;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--primary-light); }
.quiz-opt.correct { background: #ecfdf5; border-color: var(--success); color: var(--success); font-weight: 700; }
.quiz-opt.wrong   { background: #fef2f2; border-color: var(--danger);  color: var(--danger); }

/* ── Voice ── */
.voice-hero { text-align: center; padding: 16px 0 20px; }
#voice-word { font-size: 4rem; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 8px; }
#voice-meaning { font-size: 1rem; color: var(--text-muted); margin-bottom: 20px; min-height: 24px; }
#voice-status  { font-size: .95rem; font-weight: 700; margin-top: 14px; min-height: 22px; }

/* ── Search Results ── */
.search-result {
    background: var(--surface);
    border-radius: var(--r-md);
    padding: 16px;
    margin-bottom: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    animation: fadeUp .2s ease;
}
.result-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; margin-bottom: 4px; }
.result-word { font-size: 1.5rem; font-weight: 800; color: var(--primary); line-height: 1; }
.result-reading { font-size: .82rem; color: var(--text-muted); margin-bottom: 8px; }
.result-pos { font-size: .72rem; color: var(--text-muted); font-style: italic; margin-bottom: 6px; }
.result-meaning { font-size: .93rem; line-height: 1.55; }
.jlpt-badge {
    flex-shrink: 0;
    padding: 3px 9px; border-radius: 10px;
    font-size: .7rem; font-weight: 800;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
}
.search-empty { text-align: center; padding: 40px 20px; color: var(--text-muted); font-size: .95rem; }

/* ── Misc ── */
.section-title { font-size: 1rem; font-weight: 800; margin-bottom: 14px; }
.loading-stub {
    display: flex; flex-direction: column; align-items: center;
    gap: 12px; padding: 36px 20px; color: var(--text-muted);
    font-size: .9rem;
}
.error-state { text-align: center; color: var(--danger); padding: 24px; font-size: .9rem; }

/* ── Responsive ── */
@media (min-width: 600px) {
    .content { max-width: 600px; margin: 0 auto; }
    .app-header { max-width: 600px; margin: 0 auto; border-radius: 0 0 var(--r-xl) var(--r-xl); }
    .search-wrap { max-width: 600px; margin: 14px auto 0; }
}
@media (max-width: 380px) {
    .app-title { font-size: 1.15rem; }
    #voice-word { font-size: 3.2rem; }
}