/* ============================================
   AnyAI Landing Page — macOS Bright Style
   ============================================ */

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC', sans-serif;
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #fafafa;
    --bg-hover: #f0f0f2;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #aeaeb2;
    --accent-blue: #007aff;
    --accent-blue-light: rgba(0,122,255,0.08);
    --accent-purple: #af52de;
    --accent-green: #34c759;
    --accent-orange: #ff9500;
    --accent-red: #ff3b30;
    --accent-indigo: #5856d6;
    --border-color: #d2d2d7;
    --border-light: #e5e5ea;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
    --shadow-xl: 0 12px 40px rgba(0,0,0,0.12);
    --transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Header === */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-light);
}

.header__inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 10px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.header__logo {
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.header__title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header__sub {
    font-size: 11px;
    color: var(--text-secondary);
    display: block;
    line-height: 1.2;
}

.header__right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Language Switcher */
.lang-switcher { position: relative; }

.lang-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.lang-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 140px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    z-index: 200;
}

.lang-dropdown.show { display: block; }

.lang-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.lang-option:hover { background: var(--accent-blue-light); color: var(--accent-blue); }
.lang-option.active { color: var(--accent-blue); font-weight: 600; background: var(--accent-blue-light); }

/* === Hero === */
.hero {
    text-align: center;
    padding: 60px 24px 48px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero__badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.hero__badge {
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.hero__title {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.2;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__desc {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.hero__stats {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.hero__stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero__stat-num {
    font-size: 30px;
    font-weight: 800;
    color: var(--accent-blue);
    letter-spacing: -1px;
}

.hero__stat-label {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* === Section Title === */
.section-title {
    text-align: center;
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 32px;
    letter-spacing: -0.5px;
}

/* === App Grid === */
.main {
    max-width: 1080px;
    margin: 0 auto;
    padding: 48px 24px 56px;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

/* === App Card === */
.app-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s;
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-blue);
}

.app-card:hover::before { opacity: 1; }

.app-card__icon {
    font-size: 38px;
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.app-card__content { flex: 1; min-width: 0; }

.app-card__name {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.3px;
    margin-bottom: 2px;
}

.app-card__tagline {
    font-size: 13px;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 8px;
}

.app-card__desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.app-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.app-card__tag {
    font-size: 11px;
    font-weight: 500;
    padding: 3px 9px;
    background: var(--accent-blue-light);
    color: var(--accent-blue);
    border-radius: 12px;
}

.app-card__arrow {
    font-size: 18px;
    color: var(--text-tertiary);
    align-self: center;
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition);
}

.app-card:hover .app-card__arrow {
    opacity: 1;
    transform: translateX(0);
    color: var(--accent-blue);
}

/* Color accents per card */
#card-experts .app-card__icon { background: #f0ebff; border-color: #e0d5ff; }
#card-experts .app-card__tagline { color: var(--accent-indigo); }
#card-experts .app-card__tag { background: rgba(88,86,214,0.08); color: var(--accent-indigo); }
#card-experts:hover { border-color: var(--accent-indigo); }
#card-experts::before { background: linear-gradient(90deg, var(--accent-indigo), var(--accent-purple)); }

#card-prompts .app-card__icon { background: #fff0e6; border-color: #ffe0cc; }
#card-prompts .app-card__tagline { color: var(--accent-orange); }
#card-prompts .app-card__tag { background: rgba(255,149,0,0.08); color: var(--accent-orange); }
#card-prompts:hover { border-color: var(--accent-orange); }
#card-prompts::before { background: linear-gradient(90deg, var(--accent-orange), #ff6b35); }

#card-giveme .app-card__icon { background: #e8f5e9; border-color: #c8e6c9; }
#card-giveme .app-card__tagline { color: var(--accent-green); }
#card-giveme .app-card__tag { background: rgba(52,199,89,0.08); color: var(--accent-green); }
#card-giveme:hover { border-color: var(--accent-green); }
#card-giveme::before { background: linear-gradient(90deg, var(--accent-green), #30d158); }

#card-kdrama .app-card__icon { background: #fce4ec; border-color: #f8bbd0; }
#card-kdrama .app-card__tagline { color: var(--accent-red); }
#card-kdrama .app-card__tag { background: rgba(255,59,48,0.08); color: var(--accent-red); }
#card-kdrama:hover { border-color: var(--accent-red); }
#card-kdrama::before { background: linear-gradient(90deg, var(--accent-red), #ff6b6b); }

#card-ocs .app-card__icon { background: #e3f2fd; border-color: #bbdefb; }
#card-ocs .app-card__tagline { color: #2196f3; }
#card-ocs .app-card__tag { background: rgba(33,150,243,0.08); color: #2196f3; }
#card-ocs:hover { border-color: #2196f3; }
#card-ocs::before { background: linear-gradient(90deg, #2196f3, #42a5f5); }

#card-tourme .app-card__icon { background: #fef9e7; border-color: #fef0c7; }
#card-tourme .app-card__tagline { color: #f59e0b; }
#card-tourme .app-card__tag { background: rgba(245,158,11,0.08); color: #f59e0b; }
#card-tourme:hover { border-color: #f59e0b; }
#card-tourme::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }

/* === Features === */
.features {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: 56px 24px;
}

.features-grid {
    max-width: 1080px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-item {
    text-align: center;
    padding: 28px 24px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-blue);
}

.feature-item__icon {
    font-size: 36px;
    margin-bottom: 14px;
}

.feature-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* === CTA === */
.cta {
    text-align: center;
    padding: 56px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.cta__title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.cta__desc {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 24px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.cta__btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: #fff;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    cursor: pointer;
    transition: var(--transition);
}

.cta__btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 24px rgba(0,0,0,0.2);
}

/* === Footer === */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: 32px 24px;
}

.footer__inner {
    max-width: 1080px;
    margin: 0 auto;
    text-align: center;
}

.footer__brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.footer__brand img { border-radius: 6px; }

.footer__copy {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.footer__links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
}

.footer__links a {
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer__links a:hover { color: var(--accent-blue); }

.footer__seo {
    font-size: 11px;
    color: var(--text-tertiary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.5;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .hero { padding: 40px 20px 36px; }
    .hero__title { font-size: 28px; }
    .hero__desc { font-size: 15px; }
    .hero__stats { gap: 24px; }
    .hero__stat-num { font-size: 24px; }

    .main { padding: 32px 16px 40px; }
    .app-grid { grid-template-columns: 1fr; gap: 14px; }
    .app-card { padding: 20px; }

    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .features, .cta { padding: 40px 20px; }

    .section-title { font-size: 22px; margin-bottom: 24px; }
    .cta__title { font-size: 24px; }
}

@media (max-width: 480px) {
    .header__inner { padding: 8px 14px; }
    .header__title { font-size: 16px; }

    .hero { padding: 32px 16px 28px; }
    .hero__title { font-size: 24px; }
    .hero__desc { font-size: 14px; }
    .hero__stats { flex-wrap: wrap; gap: 16px; }
    .hero__stat-num { font-size: 22px; }

    .app-card { flex-direction: column; align-items: stretch; }
    .app-card__icon { width: 48px; height: 48px; font-size: 28px; }
    .app-card__desc { -webkit-line-clamp: 4; line-clamp: 4; }
    .app-card__arrow { display: none; }

    .features-grid { grid-template-columns: 1fr; }
    .feature-item { padding: 20px 16px; }

    .footer__links { flex-direction: column; gap: 8px; }
}

/* === Animations === */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero { animation: fadeInUp 0.6s ease-out; }
.app-card { animation: fadeInUp 0.5s ease-out both; }
.app-card:nth-child(1) { animation-delay: 0.05s; }
.app-card:nth-child(2) { animation-delay: 0.1s; }
.app-card:nth-child(3) { animation-delay: 0.15s; }
.app-card:nth-child(4) { animation-delay: 0.2s; }
.app-card:nth-child(5) { animation-delay: 0.25s; }
.app-card:nth-child(6) { animation-delay: 0.3s; }
.feature-item { animation: fadeInUp 0.5s ease-out both; }