/*
 * YaoNode Official Website - Commercial Grade UI System
 * Theme: Premium Minimal, Soft Tech, Dark Mode, Elegant Animations
 */
:root {
    /* Deepest sleek black (like Vercel/Linear) */
    --bg-root: #050505;
    --surface-bg: rgba(255, 255, 255, 0.02);
    --surface-elevated: rgba(255, 255, 255, 0.04);
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-highlight: rgba(255, 255, 255, 0.12);

    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.65);
    --text-tertiary: rgba(255, 255, 255, 0.45);

    /* True Commercial Orange */
    --color-accent: #F25C05;
    --color-accent-hover: #FC6F19;
    --color-accent-subtle: rgba(242, 92, 5, 0.1);

    /* Spacing & Sizes */
    --nav-height: 72px;
    --radius-md: 10px;
    --radius-lg: 16px;

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans TC', system-ui, -apple-system, sans-serif;

    /* Animation (smooth and calm) */
    --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
    --bg-root: #FAFAFA;
    --surface-bg: #FFFFFF;
    --surface-elevated: #F4F4F5;
    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-highlight: rgba(0, 0, 0, 0.14);

    --text-primary: #09090B;
    --text-secondary: #52525B;
    --text-tertiary: #A1A1AA;

    --color-accent: #E85D04;
    --color-accent-hover: #DC2F02;
    --color-accent-subtle: rgba(232, 93, 4, 0.1);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-root);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Removed gradient meshes and background glows per Commercial Spec */

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Solid Text Color */
.text-accent {
    color: var(--color-accent);
}

/* Button Component */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-smooth);
    cursor: pointer;
    white-space: nowrap;
}

.btn-lg {
    padding: 0 28px;
    height: 48px;
    font-size: 16px;
}

.btn-sm {
    padding: 0 16px;
    height: 36px;
    font-size: 14px;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
    border: 1px solid transparent;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(242, 92, 5, 0.3);
}

.btn-primary:active {
    transform: translateY(1px) scale(0.98);
}

.btn-secondary {
    background-color: var(--surface-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-highlight);
}

.btn-secondary:hover {
    background-color: var(--surface-elevated);
    border-color: var(--border-highlight);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(5, 5, 5, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 100;
    transition: background var(--transition-smooth);
}

[data-theme="light"] .navbar {
    background: rgba(250, 250, 250, 0.85);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    letter-spacing: -0.5px;
}

.brand-icon {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--text-primary);
}

/* Hero Section */
.hero-section {
    padding-top: calc(var(--nav-height) + 100px);
    padding-bottom: 100px;
    position: relative;
}

.hero-container {
    max-width: 860px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(242, 92, 5, 0.1);
    border: 1px solid rgba(242, 92, 5, 0.2);
    border-radius: 100px;
    margin-bottom: 32px;
    transition: transform var(--transition-fast);
}

.hero-badge:hover {
    transform: scale(1.02);
}

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

.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    color: var(--text-primary);
    background: var(--surface-elevated);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-accent);
}

.badge-text {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 68px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 640px;
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 64px;
}

/* Trust Stats */
.trust-indicators {
    padding-top: 48px;
    border-top: 1px solid var(--border-subtle);
    width: 100%;
}

.trust-label {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-tertiary);
    margin-bottom: 32px;
    font-weight: 600;
}

.trust-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.stat-value {
    font-size: 32px;
    font-weight: 600;
    font-feature-settings: "tnum";
    letter-spacing: -1px;
    color: var(--text-primary);
}

.stat-name {
    font-size: 13px;
    color: var(--text-secondary);
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border-subtle);
}

/* Services Section */
.services-section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    margin-bottom: 64px;
    text-align: left;
}

.section-title {
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -1px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
}

.grid-services {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--surface-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-smooth);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

/* Subtle inner top-edge shimmer */
.service-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.04) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-smooth);
    pointer-events: none;
    z-index: 1;
}

.service-card:hover {
    border-color: var(--border-highlight);
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
    background: var(--surface-elevated);
}

[data-theme="light"] .service-card:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.service-card:hover::after {
    opacity: 1;
}

.card-icon-wrapper {
    position: relative;
    margin-bottom: 24px;
    z-index: 2;
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all var(--transition-smooth);
}

.service-card:hover .card-icon {
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    border-color: rgba(242, 92, 5, 0.3);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 12px rgba(242, 92, 5, 0.15);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    z-index: 2;
}

.card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    z-index: 2;
}

/* Elegant Reveal Animations */
.reveal-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
    will-change: opacity, transform;
}

.reveal-down {
    opacity: 0;
    transform: translateY(-16px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
    will-change: opacity, transform;
}

.reveal-up.is-visible,
.reveal-down.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-1 {
    transition-delay: 50ms;
}

.stagger-2 {
    transition-delay: 150ms;
}

.stagger-3 {
    transition-delay: 250ms;
}

.stagger-4 {
    transition-delay: 350ms;
}

.stagger-5 {
    transition-delay: 450ms;
}

/* Footer Section */
.site-footer {
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-root);
    padding-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 64px;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: 16px;
}

.link-heading {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-tertiary);
}


/* Hamburger Button — base (hidden on desktop) */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
    flex-shrink: 0;
}

.hamburger:hover {
    background: var(--surface-elevated);
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1), opacity 200ms ease;
    transform-origin: center;
}

.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu Drawer — hidden on desktop */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    z-index: 99;
    background: var(--bg-root);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px 24px 24px;
    transform: translateY(-10px);
    opacity: 0;
    transition: opacity 250ms ease, transform 250ms cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.mobile-menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-link {
    padding: 14px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: block;
}

.mobile-link:hover {
    color: var(--text-primary);
    background: var(--surface-elevated);
}

/* ========== Light Mode Overrides ========== */
[data-theme="light"] .mobile-menu {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .hero-badge {
    background: rgba(232, 93, 4, 0.08);
    border-color: rgba(232, 93, 4, 0.18);
}

[data-theme="light"] .service-card {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06), 0 0 0 1px var(--border-subtle);
}

[data-theme="light"] .card-icon {
    background: #F4F4F5;
    border-color: #E4E4E7;
}

[data-theme="light"] .trust-indicators {
    border-top-color: var(--border-subtle);
}

[data-theme="light"] .stat-divider {
    background: var(--border-subtle);
}

/* ========== Mobile Responsive ========== */
@media (max-width: 1024px) {
    .grid-services {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-title {
        font-size: 56px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 44px;
        letter-spacing: -1px;
    }

    .hero-section {
        padding-top: calc(var(--nav-height) + 40px);
    }

    .trust-stats {
        flex-direction: column;
        gap: 24px;
    }

    .stat-divider {
        display: none;
    }

    .nav-links {
        display: none;
    }

    /* Hide desktop CTA but keep theme toggle and show hamburger */
    .btn-glow {
        display: none !important;
    }

    .hamburger {
        display: flex !important;
    }

    .mobile-menu {
        display: block;
    }

    .section-title {
        font-size: 28px;
    }

    .grid-services {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn-lg {
        width: 100%;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}