/* ══════════════════════════════════════════════════════════════════
   Onboarding Overhaul v2 — Brand v2.0 Oat & Rose
   作用域：.ob-intro-overlay / .pt-overlay / .first-lesson-coach
   不污染已有按钮（显式加 class 或父级 selector 限定）
   ══════════════════════════════════════════════════════════════════ */

/* ── 主 CTA（品牌豆沙渐变 + 规范阴影 + 0.15s 动效） ── */
.ob-intro-overlay .btn-primary-brand,
.pt-overlay .btn-primary-brand,
.first-lesson-coach .btn-primary-brand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 14px 24px;
    min-height: 52px;
    font-family: var(--font-brand-body);
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--rose-400) 0%, var(--rose-300) 100%);
    border: 0;
    border-radius: 14px;
    box-shadow: 0 4px 16px rgba(168, 91, 79, 0.25);
    transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.ob-intro-overlay .btn-primary-brand:hover,
.pt-overlay .btn-primary-brand:hover,
.first-lesson-coach .btn-primary-brand:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(168, 91, 79, 0.3);
}
.ob-intro-overlay .btn-primary-brand:active,
.pt-overlay .btn-primary-brand:active,
.first-lesson-coach .btn-primary-brand:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(168, 91, 79, 0.2);
}
.ob-intro-overlay .btn-primary-brand:disabled,
.pt-overlay .btn-primary-brand:disabled,
.first-lesson-coach .btn-primary-brand:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

[data-theme="dark"] .ob-intro-overlay .btn-primary-brand,
[data-theme="dark"] .pt-overlay .btn-primary-brand,
[data-theme="dark"] .first-lesson-coach .btn-primary-brand {
    background: linear-gradient(135deg, #D08B7E 0%, #B8897D 100%);
    box-shadow: 0 4px 16px rgba(208, 139, 126, 0.35);
}
[data-theme="dark"] .ob-intro-overlay .btn-primary-brand:hover,
[data-theme="dark"] .pt-overlay .btn-primary-brand:hover,
[data-theme="dark"] .first-lesson-coach .btn-primary-brand:hover {
    box-shadow: 0 6px 20px rgba(208, 139, 126, 0.4);
}

/* ── 次按钮（tertiary / text link） ── */
.ob-intro-overlay .btn-tertiary-brand,
.pt-overlay .btn-tertiary-brand,
.first-lesson-coach .btn-tertiary-brand {
    background: transparent;
    color: var(--ink-soft);
    border: 0;
    padding: 8px 12px;
    min-height: 44px;
    font-family: var(--font-brand-body);
    font-size: 0.88rem;
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 3px;
    cursor: pointer;
    transition: color 0.15s ease;
    -webkit-tap-highlight-color: transparent;
}
.ob-intro-overlay .btn-tertiary-brand:hover,
.pt-overlay .btn-tertiary-brand:hover,
.first-lesson-coach .btn-tertiary-brand:hover {
    color: var(--rose-400);
}

[data-theme="dark"] .ob-intro-overlay .btn-tertiary-brand,
[data-theme="dark"] .pt-overlay .btn-tertiary-brand,
[data-theme="dark"] .first-lesson-coach .btn-tertiary-brand {
    color: var(--muted);
}
[data-theme="dark"] .ob-intro-overlay .btn-tertiary-brand:hover,
[data-theme="dark"] .pt-overlay .btn-tertiary-brand:hover,
[data-theme="dark"] .first-lesson-coach .btn-tertiary-brand:hover {
    color: #D08B7E;
}

/* ── Fraunces 显式应用到 onboarding / placement / first-lesson 标题 ── */
.ob-intro-overlay .ob-intro-title,
.ob-intro-overlay .ob-intro-brand-name,
.pt-overlay .pt-intro-title,
.pt-overlay .pt-result-title,
.first-lesson-coach .fl-title {
    font-family: var(--font-brand-display);
    letter-spacing: -0.01em;
}

/* ── First Lesson Coach 容器 ── */
.first-lesson-coach {
    position: fixed;
    inset: 0;
    z-index: 9500;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: calc(24px + env(safe-area-inset-top)) 20px calc(24px + env(safe-area-inset-bottom));
    overflow-y: auto;
    min-height: 0;
    animation: fl-overlay-in 0.3s cubic-bezier(.4,0,.2,1);
}
@keyframes fl-overlay-in {
    from { opacity: 0; }
    to { opacity: 1; }
}
/* Flip 步特殊：覆盖层透明不阻挡，只在顶部浮动 coach hint */
.first-lesson-coach.fl-stage-flip {
    background: transparent;
    pointer-events: none;
    justify-content: flex-start;
    padding-top: calc(72px + env(safe-area-inset-top));
    z-index: 60;  /* 低于 modals（~9500），高于卡片但不阻挡点击 */
    animation: none;
}
.first-lesson-coach.fl-stage-flip .fl-step-flip-floating {
    pointer-events: auto;
    max-width: 320px;
}
.first-lesson-coach .fl-step {
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    text-align: center;
}
.first-lesson-coach .fl-fox {
    width: 120px;
    height: 120px;
    filter: drop-shadow(0 6px 18px rgba(168, 91, 79, 0.18));
}
.first-lesson-coach .fl-fox-big {
    width: 160px;
    height: 160px;
    animation: fl-fox-bounce 0.6s cubic-bezier(.34,1.56,.64,1);
}
@keyframes fl-fox-bounce {
    0% { transform: scale(0.6); opacity: 0; }
    60% { transform: scale(1.08); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}
.first-lesson-coach .fl-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.35;
    margin: 0;
}
.first-lesson-coach .fl-body {
    font-size: 0.92rem;
    color: var(--ink-soft);
    line-height: 1.65;
    max-width: 320px;
    margin: 0;
}
.first-lesson-coach .fl-streak-pop {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: linear-gradient(135deg, rgba(212, 145, 92, 0.15), rgba(168, 91, 79, 0.1));
    border: 1.5px solid rgba(212, 145, 92, 0.3);
    border-radius: 99px;
    font-family: var(--font-brand-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--caramel, #D4915C);
    animation: fl-streak-pop 0.5s cubic-bezier(.34,1.56,.64,1) 0.2s both;
}
@keyframes fl-streak-pop {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.15); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}
.first-lesson-coach .fl-coach-line {
    font-size: 0.9rem;
    color: var(--ink-soft);
    text-align: center;
    padding: 8px 16px;
    background: rgba(168, 91, 79, 0.06);
    border-radius: 99px;
    margin-bottom: 12px;
}

[data-theme="dark"] .first-lesson-coach {
    background: var(--bg);
}
[data-theme="dark"] .first-lesson-coach .fl-title {
    color: var(--text);
}
[data-theme="dark"] .first-lesson-coach .fl-body {
    color: var(--muted);  /* #B9A593 on #1A1410 → WCAG AA 4.5:1 通过 */
}
[data-theme="dark"] .first-lesson-coach .fl-streak-pop {
    background: linear-gradient(135deg, rgba(224, 168, 114, 0.15), rgba(208, 139, 126, 0.1));
    border-color: rgba(224, 168, 114, 0.3);
    color: #E0A872;
}
[data-theme="dark"] .first-lesson-coach .fl-coach-line {
    background: rgba(208, 139, 126, 0.1);
}

/* ── Placement checkpoint 狐狸贴纸（预留给 PR3） ── */
.pt-fox-sticker {
    position: fixed;
    bottom: calc(20px + env(safe-area-inset-bottom));
    right: 16px;
    z-index: 10002;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px 12px 12px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(168, 91, 79, 0.18);
    pointer-events: none;
    max-width: calc(100vw - 32px);
    animation: pt-sticker-in 0.25s cubic-bezier(.4,0,.2,1),
               pt-sticker-out 0.2s cubic-bezier(.4,0,.2,1) 2.55s forwards;
}
.pt-fox-sticker .fox-emoji-char, .pt-fox-sticker .fox-emoji {
    font-size: 32px;
    flex-shrink: 0;
    line-height: 1;
}
.pt-fox-sticker .pt-sticker-text {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
}
@keyframes pt-sticker-in {
    from { opacity: 0; transform: translateX(120%); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes pt-sticker-out {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(120%); }
}

[data-theme="dark"] .pt-fox-sticker {
    background: var(--surface);
    border-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* ── Placement result 折叠区（预留给 PR3） ── */
.pt-overlay .pt-result-details {
    width: 100%;
    max-width: 360px;
    margin-top: 20px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
}
.pt-overlay .pt-result-details summary {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink-soft);
    cursor: pointer;
    padding: 8px 0;
    list-style: none;
    text-align: center;
    transition: color 0.15s ease;
}
.pt-overlay .pt-result-details summary::-webkit-details-marker {
    display: none;
}
.pt-overlay .pt-result-details summary::after {
    content: ' ▾';
    color: var(--muted);
    transition: transform 0.15s ease;
    display: inline-block;
}
.pt-overlay .pt-result-details[open] summary::after {
    transform: rotate(180deg);
}
.pt-overlay .pt-result-details summary:hover {
    color: var(--rose-400);
}

[data-theme="dark"] .pt-overlay .pt-result-details {
    border-top-color: rgba(255, 255, 255, 0.08);
}

/* ── Intro Slide 1 品牌插画（替代 emoji） ── */
.ob-intro-overlay .ob-feat-illust {
    background: rgba(168, 91, 79, 0.06);
    border-radius: 14px;
    overflow: hidden;
}
.ob-intro-overlay .ob-feat-illust svg {
    width: 100%;
    height: 100%;
    display: block;
}
[data-theme="dark"] .ob-intro-overlay .ob-feat-illust {
    background: rgba(208, 139, 126, 0.1);
}

/* ── Intro decision page（slide 2）专用间距 ── */
.ob-intro-overlay .ob-intro-decision-cta {
    margin-top: 8px;
    width: 100%;
    max-width: 320px;
}
.ob-intro-overlay .ob-intro-decision-skip {
    margin-top: 4px;
}

/* ── Reduced motion 兼容 ── */
@media (prefers-reduced-motion: reduce) {
    .first-lesson-coach,
    .first-lesson-coach .fl-fox-big,
    .first-lesson-coach .fl-streak-pop,
    .pt-fox-sticker {
        animation: none !important;
    }
    .ob-intro-overlay .btn-primary-brand,
    .pt-overlay .btn-primary-brand,
    .first-lesson-coach .btn-primary-brand {
        transition-duration: 0.01ms !important;
    }
}