:root {
    --bg: #f5f6fb;
    --surface: #ffffff;
    --surface-2: #f0f1f8;
    --text: #1f2330;
    --text-soft: #6b7180;
    --primary: #4f46e5;
    --primary-soft: #eef0ff;
    --border: #e6e8f0;
    --danger: #ef4444;
    --shadow: 0 8px 30px rgba(31, 35, 48, .08);
    --radius: 16px;
}

[data-theme="dark"] {
    --bg: #14161f;
    --surface: #1e212c;
    --surface-2: #262a37;
    --text: #e8eaf2;
    --text-soft: #9aa0b4;
    --primary: #818cf8;
    --primary-soft: #2a2f45;
    --border: #2f3342;
    --shadow: 0 8px 30px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background .25s, color .25s;
}

.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    padding-top: max(14px, env(safe-area-inset-top));
    padding-left: max(18px, env(safe-area-inset-left));
    padding-right: max(18px, env(safe-area-inset-right));
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.brand-logo { font-size: 22px; }
.ver {
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 1px 6px;
    border-radius: 8px;
    line-height: 1.4;
}
.top-actions { display: flex; gap: 6px; }
.icon-btn {
    border: none;
    background: var(--surface-2);
    color: var(--text);
    width: 38px; height: 38px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    transition: transform .15s, background .2s;
}
.icon-btn:active { transform: scale(.92); }
.icon-btn.active { background: var(--accent); color: #fff; box-shadow: 0 0 0 3px var(--accent-soft); }

.tabs {
    display: flex;
    gap: 8px;
    padding: 12px 14px;
    position: sticky;
    top: 65px;
    z-index: 15;
    background: var(--bg);
}
.tab {
    flex: 1;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-soft);
    padding: 10px 4px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all .2s;
}
.tab.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 6px 16px rgba(79, 70, 229, .3);
}

.content { padding: 6px 16px max(40px, env(safe-area-inset-bottom)); max-width: 760px; margin: 0 auto; }
.view { display: none; animation: fade .25s ease; }
.view.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.search-box { display: flex; gap: 10px; margin: 14px 0; }
.search-input {
    flex: 1;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    padding: 14px 16px;
    border-radius: 14px;
    font-size: 16px;
    outline: none;
    transition: border .2s, box-shadow .2s;
}
.search-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.search-input.full { width: 100%; margin: 14px 0; }
.search-btn {
    border: none;
    background: var(--primary);
    color: #fff;
    padding: 0 22px;
    border-radius: 14px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: filter .2s, transform .15s;
}
.search-btn:active { transform: scale(.96); }
.search-btn:disabled { filter: grayscale(.6) opacity(.7); }

.quick-words { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.chip {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-soft);
    padding: 7px 14px;
    border-radius: 999px;
    font-size: 13px;
    cursor: pointer;
    transition: all .15s;
}
.chip:active { transform: scale(.94); }
.chip:hover { color: var(--primary); border-color: var(--primary); }

/* 词典结果 */
.dict-result { margin-top: 8px; }
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    margin-bottom: 14px;
    box-shadow: var(--shadow);
}
.word-head { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.word-title { font-size: 28px; font-weight: 800; letter-spacing: .3px; }
.word-phon { color: var(--text-soft); font-size: 16px; }
.audio-btn {
    border: none;
    background: var(--primary-soft);
    color: var(--primary);
    width: 40px; height: 40px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
}
.save-btn {
    margin-left: auto;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    padding: 8px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 13px;
}
.save-btn.saved { background: var(--primary); color: #fff; border-color: var(--primary); }

.pos {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 6px;
    margin: 14px 0 8px;
    text-transform: uppercase;
}
.def-item { padding: 8px 0; border-bottom: 1px dashed var(--border); }
.def-item:last-child { border-bottom: none; }
.def-text { line-height: 1.6; }
.def-cn { color: var(--text-soft); font-size: 14px; margin-top: 2px; }
.def-example { color: var(--text-soft); font-style: italic; font-size: 14px; margin-top: 4px; }
.def-example::before { content: "💡 "; }

.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.tag {
    font-size: 12px;
    color: var(--text-soft);
    background: var(--surface-2);
    padding: 2px 8px;
    border-radius: 6px;
}
.tag.syn { color: #0ea5e9; }
.tag.ant { color: var(--danger); }

.empty, .loading, .error {
    text-align: center;
    color: var(--text-soft);
    padding: 40px 16px;
    line-height: 1.7;
}
.error { color: var(--danger); }
.loading::after {
    content: " ";
    display: inline-block;
    width: 16px; height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .7s linear infinite;
    vertical-align: middle;
    margin-left: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 语法 */
.grammar-cats { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 14px; }
.grammar-cats .chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.grammar-item { margin-bottom: 14px; }
.grammar-item h3 { font-size: 17px; margin-bottom: 8px; }
.grammar-item p { color: var(--text-soft); line-height: 1.7; margin-bottom: 8px; }
.grammar-item .example {
    background: var(--surface-2);
    border-left: 3px solid var(--primary);
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.6;
    margin: 6px 0;
}
.grammar-item .example b { color: var(--primary); }
.grammar-item ul { padding-left: 20px; color: var(--text-soft); line-height: 1.8; }

/* 生词本 */
.words-head { display: flex; align-items: center; justify-content: space-between; margin: 16px 0; }
.words-head h2 { font-size: 20px; }
.text-btn {
    border: none; background: none; color: var(--primary);
    cursor: pointer; font-size: 14px; font-weight: 600;
}
.text-btn.danger { color: var(--danger); }
.saved-item {
    display: flex; align-items: center; gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    margin-bottom: 10px;
}
.saved-item .sw-word { font-weight: 700; font-size: 16px; }
.saved-item .sw-cn { color: var(--text-soft); font-size: 13px; flex: 1; }
.saved-item .sw-del { border: none; background: none; color: var(--danger); cursor: pointer; font-size: 18px; }

.toast {
    position: fixed;
    bottom: 28px; left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text);
    color: var(--bg);
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transition: all .25s;
    z-index: 50;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }