/* ============================================================
 * DSEPHY.AI — Cyber-Pro design tokens (v2)
 * Professional sci-fi tone (visionOS · Linear · Vercel).
 * All component classes prefixed `.cyber-*` to avoid collision
 * with existing inline CSS in index.html (esp. `.btn`).
 * ============================================================ */

:root {
    /* --- Base palette --- */
    --c-void: #07090f;
    --c-bg-panel: #0e1118;
    --c-bg-elev: #151923;
    --c-bg-tint: #11151e;
    --c-line: #1f2433;
    --c-line-strong: #2a3145;

    /* --- Accents --- */
    --c-primary: #38bdf8;
    --c-primary-soft: #0ea5e9;
    --c-primary-glow: rgba(56, 189, 248, 0.35);

    --c-accent: #a78bfa;
    --c-accent-soft: #8b5cf6;
    --c-accent-glow: rgba(167, 139, 250, 0.35);

    --c-success: #34d399;
    --c-warning: #fbbf24;
    --c-danger:  #f87171;

    /* --- Text --- */
    --c-text:        #e6ecf3;
    --c-text-dim:    #94a3b8;
    --c-text-muted:  #64748b;
    --c-text-faint:  #475569;

    /* --- Typography --- */
    --f-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --f-ui: 'Inter', 'Noto Sans TC', system-ui, -apple-system, sans-serif;
    --f-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
    --f-cjk: 'Noto Sans TC', 'Inter', sans-serif;

    /* --- Sizing --- */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-pill: 999px;

    /* --- Shadows / glow --- */
    --shadow-card: 0 1px 0 rgba(255,255,255,0.03) inset, 0 8px 24px rgba(0,0,0,0.4);
    --shadow-elev: 0 1px 0 rgba(255,255,255,0.04) inset, 0 18px 48px rgba(0,0,0,0.55);
    --glow-focus: 0 0 0 1px var(--c-primary), 0 0 0 4px rgba(56, 189, 248, 0.18);
    --glow-primary-hover: 0 0 24px rgba(56, 189, 248, 0.25);

    /* --- Motion --- */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --dur-fast: 140ms;
    --dur-base: 240ms;
}

/* ============================================================
 * Page chrome — applied via .cyber-body on <body>
 * ============================================================ */

body.cyber-body {
    background: var(--c-void) !important;
    color: var(--c-text);
    font-family: var(--f-ui);
    font-feature-settings: 'cv11', 'ss01', 'ss03';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body.cyber-body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% -10%, rgba(56, 189, 248, 0.08), transparent 60%),
        radial-gradient(ellipse 60% 40% at 100% 100%, rgba(167, 139, 250, 0.06), transparent 60%),
        radial-gradient(circle, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 28px 28px;
    pointer-events: none;
    z-index: 0;
}

body.cyber-body > * { position: relative; z-index: 1; }

/* ============================================================
 * Typography utilities
 * ============================================================ */

.t-display {
    font-family: var(--f-display);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.1;
}

.t-kicker {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-text-dim);
}

.t-mono     { font-family: var(--f-mono); font-feature-settings: 'tnum'; }
.t-mono-num { font-variant-numeric: tabular-nums; font-family: var(--f-mono); }

.t-dim   { color: var(--c-text-dim); }
.t-muted { color: var(--c-text-muted); }

.t-gradient {
    background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ============================================================
 * Surface — card / panel
 * ============================================================ */

.cyber-surface {
    background: linear-gradient(180deg, var(--c-bg-panel), var(--c-bg-tint));
    border: 1px solid var(--c-line);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow-card);
    transition: border-color var(--dur-base) var(--ease-out),
                box-shadow var(--dur-base) var(--ease-out);
}

.cyber-surface--elev {
    background: linear-gradient(180deg, var(--c-bg-elev), var(--c-bg-panel));
    border-color: var(--c-line-strong);
    box-shadow: var(--shadow-elev);
}

.cyber-surface--accent { border-color: rgba(56, 189, 248, 0.25); }

.cyber-surface--hud { position: relative; }
.cyber-surface--hud::before,
.cyber-surface--hud::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    border: 1px solid var(--c-primary);
    opacity: 0.7;
}
.cyber-surface--hud::before { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.cyber-surface--hud::after  { bottom: -1px; right: -1px; border-left: none; border-top: none; }

/* ============================================================
 * Liquid Glass — frosted, translucent surfaces
 * 用 backdrop-filter 做毛玻璃；深色 / 淺色各自一套 tint
 * ============================================================ */
.glass-panel {
    position: relative;
    background: rgba(20, 26, 38, 0.55);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.28),
                inset 0 1px 0 rgba(255, 255, 255, 0.06);
    padding: 1.5rem;
}
/* 頂部高光，模擬玻璃反光（z-index:0 + 內容 z-index:1，避免蓋住標題文字）*/
.glass-panel::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 40%;
    z-index: 0;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent);
    pointer-events: none;
}
.glass-panel > * { position: relative; z-index: 1; }

/* ---- 帳戶管理 / 表單 glass 輸入框 ---- */
.acct-input {
    background: rgba(15, 20, 30, 0.5);
    border: 1px solid rgba(148, 163, 184, 0.2);
    color: var(--c-text);
    transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}
.acct-input:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: var(--glow-focus);
    background: rgba(15, 20, 30, 0.62);
}
.acct-input::placeholder { color: var(--c-text-faint); }
.acct-select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2338bdf8' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.9rem center;
    padding-right: 2.6rem;
    cursor: pointer;
}

/* ---- 問書輸入條（Liquid Glass）---- */
.dse-input-bar {
    display: flex;
    align-items: flex-end;    /* 底邊對齊：掣同 textarea 底部齊（textarea 可向上長高）*/
    gap: 0.5rem;
    padding: 0.4rem;
    border-radius: 1rem;
    background: rgba(20, 26, 38, 0.5);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border: 1px solid rgba(148, 163, 184, 0.18);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.dse-input-tool {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.75rem;
    color: #cbd5e1;
    background: rgba(148, 163, 184, 0.10);
    border: 1px solid rgba(148, 163, 184, 0.16);
    transition: background var(--dur-base) var(--ease-out),
                color var(--dur-base) var(--ease-out),
                transform var(--dur-base) var(--ease-out);
}
.dse-input-tool:hover {
    background: rgba(56, 189, 248, 0.22);
    color: #fff;
    transform: translateY(-1px);
}
.dse-input-tool.hidden { display: none; }
.dse-input-field {
    flex: 1 1 auto;
    position: relative;
    display: flex;
    align-items: center;
    border-radius: 0.75rem;
    background: rgba(15, 20, 30, 0.45);
    border: 1px solid rgba(148, 163, 184, 0.16);
}
/* 唔靠 Tailwind .bg-transparent（compiled CSS 可能已 purge）→ 直接喺度透明 + 白字 */
.dse-input-field textarea {
    line-height: 1.5;
    background: transparent !important;
    color: #e2e8f0;
}
.dse-input-field textarea::placeholder { color: #64748b; }
.dse-input-field:focus-within {
    border-color: rgba(56, 189, 248, 0.6);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.16);
}
.dse-input-send {
    flex-shrink: 0;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0 1rem;
    border-radius: 0.75rem;
    color: #fff;
    background: linear-gradient(180deg, #22b6e6, #0ea5e9);
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.35);
    transition: filter var(--dur-base) var(--ease-out),
                transform var(--dur-base) var(--ease-out);
}
.dse-input-send:hover { filter: brightness(1.08); transform: translateY(-1px); }

/* 語音聆聽中：紅色脈動 */
.dse-input-tool.is-listening {
    background: rgba(239, 68, 68, 0.9) !important;
    color: #fff !important;
    border-color: rgba(239, 68, 68, 0.6) !important;
    animation: dse-pulse 1.1s ease-in-out infinite;
}
@keyframes dse-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5); }
    50%      { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
}

/* ============================================================
 * Buttons (.cyber-btn — avoid collision with legacy .btn)
 * ============================================================ */

.cyber-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.95rem;
    font-family: var(--f-ui);
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: -0.005em;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background var(--dur-fast), border-color var(--dur-fast),
                color var(--dur-fast), box-shadow var(--dur-base),
                transform var(--dur-fast);
    user-select: none;
    text-decoration: none;
}
.cyber-btn:active { transform: translateY(0.5px); }
.cyber-btn:disabled,
.cyber-btn[aria-disabled="true"] { opacity: 0.45; cursor: not-allowed; }

.cyber-btn--primary {
    background: linear-gradient(180deg, #0ea5e9, #0284c7);
    color: #02101d;
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 1px 0 rgba(255,255,255,0.25) inset, 0 6px 14px rgba(2, 132, 199, 0.35);
}
.cyber-btn--primary:hover {
    background: linear-gradient(180deg, #38bdf8, #0ea5e9);
    box-shadow: 0 1px 0 rgba(255,255,255,0.3) inset, 0 8px 20px rgba(56,189,248,0.4);
}

.cyber-btn--secondary {
    background: var(--c-bg-elev);
    color: var(--c-text);
    border-color: var(--c-line-strong);
}
.cyber-btn--secondary:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
    box-shadow: var(--glow-primary-hover);
}

.cyber-btn--ghost {
    background: transparent;
    color: var(--c-text-dim);
    border-color: transparent;
}
.cyber-btn--ghost:hover {
    color: var(--c-text);
    background: rgba(255, 255, 255, 0.03);
}

.cyber-btn--danger {
    background: transparent;
    color: var(--c-danger);
    border-color: rgba(248, 113, 113, 0.35);
}
.cyber-btn--danger:hover {
    background: rgba(248, 113, 113, 0.08);
    border-color: var(--c-danger);
}

.cyber-btn--google {
    background: #ffffff;
    color: #1f2937;
    border-color: rgba(0,0,0,0.08);
    box-shadow: 0 1px 0 rgba(0,0,0,0.04), 0 4px 14px rgba(0,0,0,0.35);
}
.cyber-btn--google:hover {
    background: #f8fafc;
    box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 8px 22px rgba(56,189,248,0.25);
}

.cyber-btn:focus-visible { outline: none; box-shadow: var(--glow-focus); }

/* ============================================================
 * Inputs
 * ============================================================ */

.cyber-input {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background: var(--c-bg-panel);
    border: 1px solid var(--c-line);
    border-radius: var(--radius-md);
    color: var(--c-text);
    font-family: var(--f-ui);
    font-size: 0.92rem;
    line-height: 1.5;
    outline: none;
    transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.cyber-input::placeholder { color: var(--c-text-muted); }
.cyber-input:focus { border-color: var(--c-primary); box-shadow: var(--glow-focus); }

/* ============================================================
 * Badges
 * ============================================================ */

.cyber-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.18rem 0.55rem;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border-radius: var(--radius-pill);
    background: rgba(148, 163, 184, 0.08);
    border: 1px solid var(--c-line);
    color: var(--c-text-dim);
}
.cyber-badge__dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

.cyber-badge--primary { color: var(--c-primary); border-color: rgba(56,189,248,0.3); background: rgba(56,189,248,0.06); }
.cyber-badge--success { color: var(--c-success); border-color: rgba(52,211,153,0.3); background: rgba(52,211,153,0.06); }
.cyber-badge--warning { color: var(--c-warning); border-color: rgba(251,191,36,0.3); background: rgba(251,191,36,0.06); }
.cyber-badge--danger  { color: var(--c-danger);  border-color: rgba(248,113,113,0.3); background: rgba(248,113,113,0.06); }
.cyber-badge--accent  { color: var(--c-accent);  border-color: rgba(167,139,250,0.3); background: rgba(167,139,250,0.06); }

/* ============================================================
 * KPI tile
 * ============================================================ */

.cyber-kpi {
    background: linear-gradient(180deg, var(--c-bg-panel), var(--c-bg-tint));
    border: 1px solid var(--c-line);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    transition: border-color var(--dur-base);
}
.cyber-kpi:hover { border-color: var(--c-line-strong); }

.cyber-kpi__label {
    display: flex; align-items: center; justify-content: space-between;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    color: var(--c-text-muted);
    text-transform: uppercase;
}
.cyber-kpi__value {
    margin-top: 0.5rem;
    font-family: var(--f-display);
    font-weight: 600;
    font-size: 2rem;
    line-height: 1;
    color: var(--c-text);
    font-variant-numeric: tabular-nums;
}
.cyber-kpi__value .unit {
    font-size: 0.5em;
    color: var(--c-text-muted);
    font-weight: 500;
    margin-left: 0.35rem;
    letter-spacing: 0.02em;
}
.cyber-kpi__delta { margin-top: 0.6rem; font-family: var(--f-mono); font-size: 0.72rem; color: var(--c-success); }
.cyber-kpi__delta--down { color: var(--c-danger); }

/* ============================================================
 * Progress matrix cell (DSE tracker)
 * ============================================================ */

.cyber-cell {
    width: 40px;
    height: 40px;
    background: rgba(148, 163, 184, 0.04);
    border: 1px solid var(--c-line);
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    color: var(--c-text-faint);
    cursor: pointer;
    transition: all var(--dur-base) var(--ease-out);
    flex-shrink: 0;
}
.cyber-cell:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
    background: rgba(56, 189, 248, 0.06);
    transform: translateY(-1px);
}
.cyber-cell.is-done {
    background: rgba(52, 211, 153, 0.12);
    border-color: rgba(52, 211, 153, 0.5);
    color: var(--c-success);
}
.cyber-cell.is-target {
    border-color: var(--c-accent);
    color: var(--c-accent);
    box-shadow: 0 0 0 1px var(--c-accent) inset;
}

.cyber-cell-row {
    display: flex; flex-wrap: wrap; gap: 6px;
}

/* ============================================================
 * Terminal / AI chat
 * ============================================================ */

.cyber-term {
    background: var(--c-bg-panel);
    border: 1px solid var(--c-line);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.cyber-term__head {
    display: flex; justify-content: space-between; align-items: center;
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--c-line);
    font-family: var(--f-mono);
    font-size: 0.72rem;
    color: var(--c-text-muted);
    background: var(--c-bg-tint);
}
.cyber-term__body { padding: 1rem 1.25rem; max-height: 360px; overflow-y: auto; }

.cyber-msg {
    display: flex; gap: 0.75rem;
    padding: 0.55rem 0;
    font-family: var(--f-ui);
    font-size: 0.95rem;
    line-height: 1.6;
}
.cyber-msg__role {
    flex: 0 0 auto;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--c-text-muted);
    padding-top: 4px;
    min-width: 56px;
}
.cyber-msg--user .cyber-msg__role { color: var(--c-accent); }
.cyber-msg--ai   .cyber-msg__role { color: var(--c-primary); }
.cyber-msg--sys  .cyber-msg__role { color: var(--c-warning); }
.cyber-msg__body { color: var(--c-text); }
.cyber-msg--sys .cyber-msg__body { color: var(--c-text-dim); font-family: var(--f-mono); font-size: 0.85rem; }

.cyber-cursor {
    display: inline-block;
    width: 2px; height: 1.05em;
    background: var(--c-primary);
    vertical-align: text-bottom;
    margin-left: 2px;
    animation: cyber-blink 1.1s steps(1) infinite;
}
@keyframes cyber-blink { 50% { opacity: 0; } }

/* ============================================================
 * Quiz answer cards
 * ============================================================ */

.cyber-ans {
    display: flex; align-items: center; gap: 0.8rem;
    padding: 0.85rem 1.1rem;
    background: var(--c-bg-panel);
    border: 1px solid var(--c-line);
    border-radius: var(--radius-md);
    font-family: var(--f-ui);
    font-size: 0.95rem;
    cursor: pointer;
    transition: border-color var(--dur-fast), background var(--dur-fast),
                box-shadow var(--dur-base);
}
.cyber-ans__letter {
    flex: 0 0 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: var(--c-bg-elev);
    border: 1px solid var(--c-line-strong);
    display: inline-flex; align-items: center; justify-content: center;
    font-family: var(--f-mono);
    font-size: 0.78rem;
    color: var(--c-text-dim);
}
.cyber-ans:hover { border-color: var(--c-line-strong); }
.cyber-ans.is-selected { border-color: var(--c-primary); background: rgba(56,189,248,0.05); }
.cyber-ans.is-selected .cyber-ans__letter { color: var(--c-primary); border-color: var(--c-primary); }
.cyber-ans.is-correct  { border-color: rgba(52,211,153,0.55); background: rgba(52,211,153,0.06); }
.cyber-ans.is-correct .cyber-ans__letter { color: var(--c-success); border-color: var(--c-success); }
.cyber-ans.is-wrong    { border-color: rgba(248,113,113,0.5); background: rgba(248,113,113,0.05); }
.cyber-ans.is-wrong .cyber-ans__letter { color: var(--c-danger); border-color: var(--c-danger); }

/* ============================================================
 * Tabs / segmented control
 * ============================================================ */

.cyber-tabs {
    display: inline-flex;
    padding: 3px;
    background: var(--c-bg-panel);
    border: 1px solid var(--c-line);
    border-radius: var(--radius-md);
}
.cyber-tab {
    padding: 0.4rem 0.85rem;
    font-family: var(--f-ui);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--c-text-dim);
    border-radius: calc(var(--radius-md) - 2px);
    cursor: pointer;
    transition: color var(--dur-fast), background var(--dur-fast);
}
.cyber-tab:hover { color: var(--c-text); }
.cyber-tab.is-active {
    color: var(--c-text);
    background: var(--c-bg-elev);
    box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset;
}

/* ============================================================
 * Progress bar
 * ============================================================ */

.cyber-bar {
    height: 6px;
    background: var(--c-bg-elev);
    border-radius: var(--radius-pill);
    overflow: hidden;
    border: 1px solid var(--c-line);
}
.cyber-bar__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
    border-radius: var(--radius-pill);
    transition: width var(--dur-base) var(--ease-out);
}

/* ============================================================
 * Divider
 * ============================================================ */

.cyber-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--c-line) 20%, var(--c-line) 80%, transparent);
    margin: 2rem 0;
}

@media (prefers-reduced-motion: reduce) {
    .cyber-cursor { animation: none; }
}

/* ============================================================
 * LIGHT THEME  (set <html data-theme="light">)
 * 1) 重定義 design tokens → 自動 reskin 所有 .cyber-* 組件
 * 2) Remap 頁面大量用到嘅 Tailwind 深色 utilities
 * 3) 彩色按鈕保留白字（放最後 override）
 * ============================================================ */
:root[data-theme="light"] {
    --c-void: #fdfcf4;       /* 暖色淺黃打底，配藍色 accent */
    --c-bg-panel: #fffefb;   /* 卡片：近白帶暖 */
    --c-bg-elev: #fffdf7;
    --c-bg-tint: #f5f7fb;    /* 卡片漸層底，淺藍一級 */
    --c-line: #ece8dc;       /* 邊線帶暖 */
    --c-line-strong: #ddd8c8;

    --c-text:        #0f172a;
    --c-text-dim:    #475569;
    --c-text-muted:  #64748b;
    --c-text-faint:  #94a3b8;

    --shadow-card: 0 1px 2px rgba(15,23,42,0.06), 0 6px 18px rgba(15,23,42,0.08);
    --shadow-elev: 0 1px 2px rgba(15,23,42,0.08), 0 14px 34px rgba(15,23,42,0.12);
    --glow-focus: 0 0 0 1px var(--c-primary), 0 0 0 4px rgba(14, 165, 233, 0.18);
    --glow-primary-hover: 0 0 18px rgba(14, 165, 233, 0.18);
}

/* 頁面底色（更白、更乾淨）*/
:root[data-theme="light"] body,
:root[data-theme="light"] body.cyber-body {
    /* 暖色淺黃 → 淺藍嘅柔和漸層，warm + cool 撈埋 */
    background: linear-gradient(170deg, #fdfbf2 0%, #faf8ee 38%, #f1f5fc 100%) !important;
    color: var(--c-text);
}
:root[data-theme="light"] body.cyber-body::before {
    background:
        radial-gradient(ellipse 75% 55% at 50% -10%, rgba(250, 204, 21, 0.10), transparent 62%),
        radial-gradient(ellipse 65% 50% at 8% 92%, rgba(14, 165, 233, 0.07), transparent 60%),
        radial-gradient(ellipse 60% 45% at 96% 100%, rgba(99, 102, 241, 0.05), transparent 60%),
        radial-gradient(circle, rgba(120, 113, 80, 0.03) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 100% 100%, 28px 28px;
}
/* 側欄漸層 → 淺色 */
:root[data-theme="light"] #cyberSidebar {
    background: linear-gradient(180deg, #ffffff, #f5f7fb) !important;
}

/* --- Tailwind 深色底 → 淺色面 --- */
:root[data-theme="light"] .bg-gray-900 { background-color: #e2e8f0; }
:root[data-theme="light"] .bg-gray-800 { background-color: #ffffff; }
:root[data-theme="light"] .bg-gray-700 { background-color: #f1f5f9; }
:root[data-theme="light"] .bg-gray-600 { background-color: #e2e8f0; }
:root[data-theme="light"] .bg-gray-500 { background-color: #cbd5e1; }
:root[data-theme="light"] .bg-gray-900\/95 { background-color: rgba(248,250,252,0.95); }
:root[data-theme="light"] .bg-gray-900\/80 { background-color: rgba(248,250,252,0.85); }
:root[data-theme="light"] .bg-gray-900\/60 { background-color: rgba(241,245,249,0.7); }
:root[data-theme="light"] .bg-gray-800\/60 { background-color: rgba(255,255,255,0.7); }
:root[data-theme="light"] .bg-gray-700\/50 { background-color: rgba(241,245,249,0.6); }
:root[data-theme="light"] .bg-gray-700\/30 { background-color: rgba(241,245,249,0.4); }

/* --- 文字 --- */
:root[data-theme="light"] .text-white   { color: #0f172a; }
:root[data-theme="light"] .text-gray-200 { color: #1e293b; }
:root[data-theme="light"] .text-gray-300 { color: #334155; }
:root[data-theme="light"] .text-gray-400 { color: #475569; }
:root[data-theme="light"] .text-gray-500 { color: #64748b; }

/* --- 邊框 --- */
:root[data-theme="light"] .border-gray-500 { border-color: #cbd5e1; }
:root[data-theme="light"] .border-gray-600 { border-color: #cbd5e1; }
:root[data-theme="light"] .border-gray-700 { border-color: #e2e8f0; }
:root[data-theme="light"] .border-gray-800 { border-color: #e2e8f0; }

/* AI 對話泡泡（硬編碼深色）→ 淺色 */
:root[data-theme="light"] .chat-bubble-ai { background-color: #e2e8f0; color: #0f172a; }

/* --- 蓋過 index.html 嘅 legacy 深色 !important 規則（標題/輸入/側欄）--- */
/* 注意：刻意唔郁 .text-white，等彩色按鈕（bg-cyan 等）保留白字 */
:root[data-theme="light"] #tab-content-tracker h1,
:root[data-theme="light"] #tab-content-tracker h2,
:root[data-theme="light"] #tab-content-tracker h3,
:root[data-theme="light"] #tab-content-tracker .text-2xl,
:root[data-theme="light"] .bg-gray-800 h1,
:root[data-theme="light"] .bg-gray-800 h2,
:root[data-theme="light"] .bg-gray-800 h3,
:root[data-theme="light"] .bg-gray-900 h1,
:root[data-theme="light"] .bg-gray-900 h2,
:root[data-theme="light"] .bg-gray-900 h3,
:root[data-theme="light"] #formTitle {
    color: #0f172a !important;
}
/* 默認標題灰 (#e2e8f0) → 深色 */
:root[data-theme="light"] h1:not(.text-white):not(.text-cyan-400):not(.text-yellow-400):not(.text-green-400),
:root[data-theme="light"] h2:not(.text-white):not(.text-cyan-400):not(.text-yellow-400):not(.text-green-400),
:root[data-theme="light"] h3:not(.text-white):not(.text-cyan-400):not(.text-yellow-400):not(.text-green-400),
:root[data-theme="light"] h4:not(.text-white):not(.text-cyan-400):not(.text-yellow-400):not(.text-green-400),
:root[data-theme="light"] h5:not(.text-white):not(.text-cyan-400):not(.text-yellow-400):not(.text-green-400),
:root[data-theme="light"] h6:not(.text-white):not(.text-cyan-400):not(.text-yellow-400):not(.text-green-400) {
    color: #0f172a;
}
/* 問書輸入框文字（legacy color:white !important）→ 深色 */
:root[data-theme="light"] #dseChatInput,
:root[data-theme="light"] #dseChatInput:focus { color: #0f172a !important; }
:root[data-theme="light"] #dseChatInput::placeholder { color: #94a3b8; }
/* 側欄 active 項（legacy 近白字 #eaf6ff）→ 深藍可見 */
:root[data-theme="light"] #cyberSidebar .sb-item.is-active {
    color: #0c4a6e;
    background: rgba(56, 189, 248, 0.16);
}
:root[data-theme="light"] #cyberSidebar .sb-item { color: #475569; }
:root[data-theme="light"] #cyberSidebar .sb-item:hover { color: #0f172a; }
/* 聊天泡泡富文本：黃色 strong 喺淺底太淺 → 加深 */
:root[data-theme="light"] .message-content strong,
:root[data-theme="light"] .ai-reply strong,
:root[data-theme="light"] .saved-qa-content strong { color: #b45309; }

/* --- 彩色按鈕保留白字（必須放喺 .text-white remap 之後）--- */
:root[data-theme="light"] .bg-cyan-400, :root[data-theme="light"] .bg-cyan-500,
:root[data-theme="light"] .bg-cyan-600, :root[data-theme="light"] .bg-cyan-700,
:root[data-theme="light"] .bg-sky-600, :root[data-theme="light"] .bg-sky-700,
:root[data-theme="light"] .bg-blue-500, :root[data-theme="light"] .bg-blue-600, :root[data-theme="light"] .bg-blue-700,
:root[data-theme="light"] .bg-indigo-500,
:root[data-theme="light"] .bg-purple-500, :root[data-theme="light"] .bg-purple-600, :root[data-theme="light"] .bg-purple-700,
:root[data-theme="light"] .bg-red-400, :root[data-theme="light"] .bg-red-500, :root[data-theme="light"] .bg-red-600, :root[data-theme="light"] .bg-red-700,
:root[data-theme="light"] .bg-green-400, :root[data-theme="light"] .bg-green-500, :root[data-theme="light"] .bg-green-600, :root[data-theme="light"] .bg-green-700,
:root[data-theme="light"] .bg-teal-600, :root[data-theme="light"] .bg-teal-700 {
    color: #ffffff;
}

/* --- 灰底按鈕（remap 成淺色）若帶 text-white 會睇唔到字，強制深色 --- */
:root[data-theme="light"] .bg-gray-600.text-white,
:root[data-theme="light"] .bg-gray-700.text-white,
:root[data-theme="light"] .bg-gray-800.text-white,
:root[data-theme="light"] .bg-gray-900.text-white {
    color: #0f172a !important;
}

/* --- Liquid Glass：淺色 tint --- */
:root[data-theme="light"] .glass-panel {
    background: rgba(255, 255, 255, 0.6);
    border-color: rgba(15, 23, 42, 0.08);
    box-shadow: 0 8px 32px rgba(15, 23, 42, 0.1),
                inset 0 1px 0 rgba(255, 255, 255, 0.7);
}
:root[data-theme="light"] .glass-panel::before {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.55), transparent);
}
:root[data-theme="light"] .dse-input-bar {
    background: rgba(255, 255, 255, 0.6);
    border-color: rgba(15, 23, 42, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}
:root[data-theme="light"] .dse-input-tool {
    color: #475569;
    background: rgba(15, 23, 42, 0.05);
    border-color: rgba(15, 23, 42, 0.08);
}
:root[data-theme="light"] .dse-input-tool:hover { color: #0c4a6e; background: rgba(56, 189, 248, 0.16); }
:root[data-theme="light"] .dse-input-field {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(15, 23, 42, 0.1);
}
:root[data-theme="light"] #dseChatInput { color: #0f172a !important; }
/* 淺色玻璃高光收細，唔好洗白底下文字 */
:root[data-theme="light"] .glass-panel::before {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.35), transparent);
}

/* ============================================================
 * Light mode — 對比修正（字 / badge / 強調）
 * ============================================================ */
/* badge 淺青字喺近白底太淺 → 加深 */
:root[data-theme="light"] .cyber-badge--primary { color: #0369a1; border-color: rgba(3,105,161,0.28); background: rgba(3,105,161,0.07); }
:root[data-theme="light"] .cyber-badge--success { color: #047857; border-color: rgba(4,120,87,0.28);  background: rgba(4,120,87,0.07); }
:root[data-theme="light"] .cyber-badge--warning { color: #b45309; border-color: rgba(180,83,9,0.28);  background: rgba(180,83,9,0.07); }
:root[data-theme="light"] .cyber-badge--danger  { color: #b91c1c; border-color: rgba(185,28,28,0.28);  background: rgba(185,28,28,0.07); }
:root[data-theme="light"] .cyber-badge--accent  { color: #6d28d9; border-color: rgba(109,40,217,0.28); background: rgba(109,40,217,0.07); }

/* AI 泡泡正文：index.html inline `.text-white{color:white!important}` 喺淺底睇唔到字。
   AI 泡泡用 bg-gray-700（light 已 remap 成淺底），所以泡泡內 .text-white 文字必須轉深。
   用較高 specificity + !important 鬥贏 inline !important。*/
:root[data-theme="light"] .ai-message .message-content.text-white,
:root[data-theme="light"] .ai-message .text-white,
:root[data-theme="light"] .bg-gray-700 .message-content,
:root[data-theme="light"] .bg-gray-700.text-white { color: #0f172a !important; }
/* 用戶泡泡係 bg-cyan-600（深青）→ 保留白字 */
:root[data-theme="light"] .user-message .text-white,
:root[data-theme="light"] [class*="bg-cyan-6"] .message-content { color: #ffffff !important; }

/* AI 回覆富文本：斜體淺灰(#cbd5e1)喺淺底睇唔到 → 轉深 */
:root[data-theme="light"] .message-content em,
:root[data-theme="light"] .ai-reply em,
:root[data-theme="light"] .saved-qa-content em { color: #475569; }
/* AI 回覆 h3 淺藍(#63b3ed)喺淺底偏淺 → 加深少少 */
:root[data-theme="light"] .ai-reply h3,
:root[data-theme="light"] .message-content h3,
:root[data-theme="light"] .saved-qa-content h3 { color: #0369a1; }
/* 純青/紫標題色喺淺底偏淺 → 統一加深，仍保留品牌色感 */
:root[data-theme="light"] .text-cyan-400,
:root[data-theme="light"] .text-cyan-300 { color: #0284c7; }
:root[data-theme="light"] .text-purple-400,
:root[data-theme="light"] .text-purple-300 { color: #7c3aed; }
:root[data-theme="light"] .text-green-400 { color: #059669; }
:root[data-theme="light"] .text-yellow-400 { color: #b45309; }
:root[data-theme="light"] .text-red-400 { color: #dc2626; }
/* 但彩色按鈕（有 bg-*）內嘅文字唔受上面影響：保留白字 */
:root[data-theme="light"] [class*="bg-cyan-"].text-cyan-400,
:root[data-theme="light"] [class*="bg-purple-"].text-purple-400 { color: #fff; }

/* 帳戶管理表單輸入框：淺色 tint */
:root[data-theme="light"] .acct-input {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(15, 23, 42, 0.14);
    color: #0f172a;
}
:root[data-theme="light"] .acct-input:focus {
    background: #ffffff;
    border-color: var(--c-primary);
}
:root[data-theme="light"] .acct-input::placeholder { color: #94a3b8; }
:root[data-theme="light"] .acct-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%230369a1' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

/* ============================================================
 * Light mode — 漸變標題 .t-display / .t-kicker
 * index.html inline `.t-display` 用淺白→淺藍→淺紫漸變，喺淺底睇唔清。
 * 淺色模式換成 深藍→靛藍→紫 嘅高對比漸變（去除淺藍）。
 * ============================================================ */
:root[data-theme="light"] .t-display {
    background: linear-gradient(120deg, #0369a1, #4338ca 52%, #7c3aed) !important;
    -webkit-background-clip: text !important;
    background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
}
:root[data-theme="light"] .t-kicker {
    background: linear-gradient(90deg, #0369a1, #6d28d9, #0369a1) !important;
    background-size: 200% auto !important;
    -webkit-background-clip: text !important;
    background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
}
/* .t-gradient（DSEPHY.AI 嘅 .AI 等）若用淺色漸變一併加深 */
:root[data-theme="light"] .t-gradient {
    background: linear-gradient(120deg, #0369a1, #7c3aed) !important;
    -webkit-background-clip: text !important;
    background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
}

/* ============================================================
 * Light mode — KaTeX 數式顏色
 * KaTeX span 繼承自父層；AI 泡泡 inline `.text-white` 令數式變白，
 * 喺淺底完全睇唔到。強制 AI / 已儲存 / 富文本 區域嘅數式為深色。
 * ============================================================ */
:root[data-theme="light"] .message-content .katex,
:root[data-theme="light"] .message-content .katex *,
:root[data-theme="light"] .ai-reply .katex,
:root[data-theme="light"] .ai-reply .katex *,
:root[data-theme="light"] .saved-qa-content .katex,
:root[data-theme="light"] .saved-qa-content .katex *,
:root[data-theme="light"] .ai-message .katex,
:root[data-theme="light"] .ai-message .katex * {
    color: #0f172a !important;
    -webkit-text-fill-color: #0f172a !important;
}
/* code / pre / 行內數式 fallback 文字 */
:root[data-theme="light"] .message-content code,
:root[data-theme="light"] .ai-reply code,
:root[data-theme="light"] .saved-qa-content code {
    color: #0f172a !important;
    background: rgba(15, 23, 42, 0.06);
}
/* 用戶泡泡（深青底）內嘅數式保留白字 */
:root[data-theme="light"] .user-message .katex,
:root[data-theme="light"] .user-message .katex *,
:root[data-theme="light"] [class*="bg-cyan-6"] .katex,
:root[data-theme="light"] [class*="bg-cyan-6"] .katex * {
    color: #ffffff !important;
    -webkit-text-fill-color: #ffffff !important;
}
