/* ===========================
   CSS Variables & Base Styles
   =========================== */
:root {
    /* Color Palette - Modern Grey */
    --color-bg-primary: #0a0a0b;
    --color-bg-secondary: #111113;
    --color-bg-tertiary: #1a1a1d;
    --color-bg-card: #18181b;

    --color-text-primary: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;

    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-dark: #4f46e5;

    --color-success: #22c55e;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.12);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-dark: linear-gradient(180deg, #0a0a0b 0%, #111113 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);

    /* Typography */
    --font-primary: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Language Switcher */
.lang-switcher-container {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1002;
    display: none;
    gap: var(--spacing-xs);
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(99, 102, 241, 0.9);
    color: white;
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.lang-switcher:hover {
    background: var(--color-accent);
    transform: scale(1.05);
}

.lang-switcher.active {
    background: var(--color-accent);
}

@media (max-width: 768px) {
    .lang-switcher-container {
        display: flex;
    }
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: all var(--transition-normal);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 11, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.nav-logo:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link-cta {
    background: var(--gradient-primary);
    color: var(--color-text-primary) !important;
    padding: var(--spacing-sm) var(--spacing-lg);
}

.nav-link-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: var(--spacing-4xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 80% at 50% -20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 60% at 80% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    color: var(--color-accent);
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-name {
    margin-bottom: var(--spacing-lg);
}

.name-english {
    display: block;
    font-size: var(--font-size-6xl);
    font-weight: 700;
    line-height: 1.1;
    background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.name-chinese {
    display: block;
    font-size: var(--font-size-3xl);
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-top: var(--spacing-sm);
}

.hero-title {
    font-size: var(--font-size-2xl);
    color: var(--color-text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-title .separator {
    color: var(--color-accent);
    margin: 0 var(--spacing-sm);
}

.hero-tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-company {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.hero-company i {
    color: var(--color-accent);
}

.hero-education {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.hero-education i {
    color: var(--color-accent-light);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow), var(--shadow-xl);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border-light);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-3px);
}

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-frame {
    position: relative;
    width: 350px;
    height: 350px;
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 3px solid var(--color-border-light);
    background: var(--gradient-card);
}

.image-frame::before {
    content: '';
    position: absolute;
    inset: -50%;
    background: conic-gradient(from 0deg, transparent, var(--color-accent), transparent 30%);
    animation: rotate 8s linear infinite;
    opacity: 0.3;
}

@keyframes rotate {
    100% {
        transform: rotate(360deg);
    }
}

.profile-photo {
    position: absolute;
    inset: 3px;
    width: calc(100% - 6px);
    height: calc(100% - 6px);
    object-fit: cover;
    object-position: center top;
    border-radius: var(--radius-full);
    z-index: 1;
}

.image-placeholder {
    position: absolute;
    inset: 2px;
    background: var(--color-bg-tertiary);
    border-radius: calc(var(--radius-2xl) - 2px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-text-muted);
}

.image-placeholder i {
    font-size: 4rem;
    opacity: 0.3;
}

.image-placeholder span {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    opacity: 0.5;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-muted);
    font-size: var(--font-size-xl);
    animation: bounce 2s infinite;
    text-decoration: none;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ===========================
   Sections
   =========================== */
.section {
    padding: var(--spacing-4xl) 0;
    position: relative;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-3xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-title.light {
    color: var(--color-text-primary);
}

.title-number {
    color: var(--color-accent);
    font-family: 'Inter', monospace;
    font-size: var(--font-size-xl);
    font-weight: 600;
}

/* ===========================
   About Section
   =========================== */
.about {
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.about-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
}

.about-text p {
    margin-bottom: var(--spacing-lg);
}

.about-intro {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
}

.about-intro strong {
    color: var(--color-accent);
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.highlight-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.highlight-card:hover {
    border-color: var(--color-accent);
    transform: translateX(10px);
    box-shadow: var(--shadow-glow);
}

.highlight-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
}

.highlight-content h3 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.highlight-content p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ===========================
   Experience Timeline
   =========================== */
.experience {
    background: var(--color-bg-primary);
}

.timeline {
    position: relative;
    padding-left: var(--spacing-3xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-2xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--spacing-3xl) + 4px);
    width: 14px;
    height: 14px;
    background: var(--color-bg-primary);
    border: 3px solid var(--color-text-muted);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.timeline-marker.current {
    border-color: var(--color-accent);
    background: var(--color-accent);
    box-shadow: 0 0 20px var(--color-accent);
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.3);
    border-color: var(--color-accent);
}

.timeline-content {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-content {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.timeline-date {
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.timeline-duration {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
}

.timeline-badge {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.timeline-badge.current {
    background: var(--gradient-primary);
    color: white;
}

.timeline-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-company {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.timeline-company i {
    color: var(--color-accent);
    font-size: var(--font-size-sm);
}

.timeline-company-en {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* ===========================
   Education Section
   =========================== */
.education {
    background: var(--color-bg-secondary);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.education-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.education-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.education-card.current {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
}

.education-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
}

.education-content {
    flex: 1;
}

.education-badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.education-year {
    display: inline-block;
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.education-school {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.education-school-en {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.education-degree {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    font-weight: 500;
}

.education-degree-en {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.education-class {
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.education-activities {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.activity-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
}

.activity-tag i {
    color: var(--color-accent);
}

/* ===========================
   Skills Section
   =========================== */
.skills {
    background: var(--color-bg-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.skill-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.skill-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-10px);
    box-shadow: var(--shadow-glow);
}

.skill-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-2xl);
}

.skill-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.skill-title-en {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    margin-bottom: var(--spacing-md);
}

.skill-list {
    list-style: none;
    text-align: left;
}

.skill-list li {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.skill-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transform: translateY(-50%);
}

/* ===========================
   Contact Section
   =========================== */
.contact {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-top: 1px solid var(--color-border);
}

.contact-intro {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.contact-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    text-decoration: none;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.contact-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xl);
    color: white;
}

.contact-label {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.contact-value {
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    word-break: break-all;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ===========================
   Back to Top
   =========================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    font-size: var(--font-size-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

/* ===========================
   Animations
   =========================== */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

/* ===========================
   Responsive Design
   =========================== */

/* Tablet */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
    }

    .image-frame {
        width: 280px;
        height: 320px;
    }

    .hero-cta {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-highlights {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .highlight-card {
        flex: 1;
        min-width: 200px;
    }

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

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

/* Mobile */
@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2rem;
        --font-size-5xl: 1.75rem;
        --font-size-4xl: 1.5rem;
        --font-size-3xl: 1.25rem;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 11, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-lg);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .nav-link {
        font-size: var(--font-size-xl);
    }

    /* Hero compact for mobile */
    .hero {
        min-height: 100vh;
        min-height: 100dvh;
        padding: var(--spacing-lg) 0 var(--spacing-md);
    }

    /* Hide navbar on mobile */
    .navbar {
        display: none;
    }

    .hero-content {
        gap: var(--spacing-lg);
    }

    .hero-greeting {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-xs);
        letter-spacing: 1px;
    }

    .hero-name {
        margin-bottom: var(--spacing-sm);
    }

    .name-english {
        font-size: var(--font-size-5xl);
    }

    .name-chinese {
        font-size: var(--font-size-xl);
        margin-top: var(--spacing-xs);
    }

    .hero-title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-sm);
    }

    .hero-company {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-xs);
        justify-content: center;
    }

    .hero-education {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-md);
        justify-content: center;
    }

    .hero-tagline {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-lg);
        line-height: 1.6;
    }

    .hero-cta {
        gap: var(--spacing-sm);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }

    .image-frame {
        width: 200px;
        height: 200px;
    }

    .scroll-indicator {
        bottom: var(--spacing-sm);
        font-size: var(--font-size-base);
    }

    .timeline {
        padding-left: var(--spacing-xl);
    }

    .timeline::before {
        left: 6px;
    }

    .timeline-marker {
        left: calc(-1 * var(--spacing-xl));
        width: 12px;
        height: 12px;
    }

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

    .education-card {
        flex-direction: column;
        text-align: center;
    }

    .education-activities {
        justify-content: center;
    }

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

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

    .highlight-card {
        flex-direction: column;
        text-align: center;
    }

    .highlight-card:hover {
        transform: translateY(-5px);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }

    .about-highlights {
        flex-direction: column;
    }

    .highlight-card {
        flex-direction: row;
        text-align: left;
    }
}