/* ============================================
   GLOBAL STYLES & VARIABLES
   ============================================ */

:root {
    /* Colors */
    --color-primary: #000;
    --color-secondary: #fff;
    --color-accent: #0071e3;
    --color-accent-light: #f5f5f7;
    --color-text: #1d1d1d;
    --color-text-secondary: #666;
    --color-border: #e5e5e7;
    --color-bg: #fff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-tertiary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-quaternary: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Noto Sans HK', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Monaco', 'Courier New', monospace;
    
    /* Sizes */
    --size-xs: 12px;
    --size-sm: 14px;
    --size-base: 16px;
    --size-lg: 18px;
    --size-xl: 20px;
    --size-2xl: 24px;
    --size-3xl: 32px;
    --size-4xl: 40px;
    --size-5xl: 48px;
    --size-6xl: 64px;
    --size-7xl: 80px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: var(--size-7xl); }
h2 { font-size: var(--size-5xl); }
h3 { font-size: var(--size-3xl); }
h4 { font-size: var(--size-2xl); }
h5 { font-size: var(--size-xl); }
h6 { font-size: var(--size-lg); }

p {
    font-size: var(--size-base);
    color: var(--color-text-secondary);
}

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

a:hover {
    color: #0051ba;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--size-xl);
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
}

.nav-link {
    font-size: var(--size-sm);
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

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

.nav-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-fast);
    border-radius: 1px;
}

.nav-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.nav-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-dropdown);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.mobile-menu.active {
    max-height: 300px;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
}

.mobile-link {
    font-size: var(--size-base);
    font-weight: 500;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.mobile-link:hover {
    color: var(--color-accent);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 60px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    top: -100px;
    right: -100px;
    animation: float 20s ease-in-out infinite;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    bottom: 100px;
    left: -50px;
    animation: float 25s ease-in-out infinite reverse;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float 30s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-lg);
}

.hero-title-wrapper {
    margin-bottom: var(--spacing-2xl);
}

.hero-title {
    font-size: clamp(3rem, 10vw, 8rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.hero-title-line {
    display: block;
    opacity: 0;
}

.hero-title-line:nth-child(2) {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--size-2xl);
    font-weight: 300;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    opacity: 0;
}

.hero-description {
    font-size: var(--size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
}

.cta-primary, .cta-secondary {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--size-base);
    font-weight: 600;
    border-radius: 50px;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.cta-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.cta-secondary {
    background: rgba(255, 255, 255, 0.8);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    backdrop-filter: blur(10px);
}

.cta-secondary:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    animation: bounce 2s ease-in-out infinite;
    z-index: 1;
}

.scroll-mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text);
    border-radius: 12px;
    position: relative;
}

.scroll-wheel {
    width: 2px;
    height: 8px;
    background: var(--color-text);
    border-radius: 1px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0; transform: translateX(-50%) translateY(10px); }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* ============================================
   SECTIONS
   ============================================ */

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

.section-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-label {
    display: inline-block;
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.title-line {
    display: block;
}

.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: var(--size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
    background: linear-gradient(180deg, #f5f7fa 0%, #fff 100%);
}

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

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    aspect-ratio: 1;
    border-radius: 20px;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

.placeholder-icon {
    width: 100px;
    height: 100px;
    color: var(--color-accent);
    opacity: 0.5;
}

.image-glow {
    position: absolute;
    inset: -20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    opacity: 0.1;
    filter: blur(30px);
    z-index: -1;
}

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

.about-intro {
    font-size: var(--size-2xl);
    font-weight: 600;
    line-height: 1.4;
}

.about-description {
    font-size: var(--size-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.stat-item {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.stat-number {
    font-size: var(--size-5xl);
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-plus {
    font-size: var(--size-2xl);
    color: var(--color-accent);
}

.stat-label {
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
    display: block;
    width: 100%;
}

/* ============================================
   SKILLS SECTION
   ============================================ */

.skills {
    background: linear-gradient(180deg, #fff 0%, #f5f7fa 100%);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.skill-card {
    padding: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
    cursor: pointer;
}

.skill-card:hover {
    transform: translateY(-8px);
    border-color: rgba(102, 126, 234, 0.2);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.1);
}

.skill-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    color: white;
    margin-bottom: var(--spacing-lg);
    transition: transform var(--transition-base);
}

.skill-card:hover .skill-icon {
    transform: scale(1.1) rotate(5deg);
}

.skill-title {
    font-size: var(--size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.skill-description {
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.skill-level {
    height: 4px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 2px;
    overflow: hidden;
}

.skill-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
    width: 0;
    transition: width 1s ease-out;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

.projects {
    background: linear-gradient(180deg, #f5f7fa 0%, #fff 100%);
}

.projects-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.project-card {
    border-radius: 16px;
    overflow: hidden;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all var(--transition-base);
    cursor: pointer;
}

.project-card.large {
    grid-column: span 2;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(102, 126, 234, 0.2);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.1);
}

.project-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--size-6xl);
    font-weight: 700;
    color: rgba(255, 255, 255, 0.2);
}

.gradient-bg-1 { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.gradient-bg-2 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.gradient-bg-3 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.gradient-bg-4 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links {
    display: flex;
    gap: var(--spacing-lg);
}

.project-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: white;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.project-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.project-info {
    padding: var(--spacing-2xl);
}

.project-category {
    display: inline-block;
    font-size: var(--size-xs);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

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

.project-description {
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    color: var(--color-accent);
    border-radius: 20px;
    font-size: var(--size-xs);
    font-weight: 500;
}

.projects-cta {
    text-align: center;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    border-radius: 50px;
    font-weight: 600;
    transition: all var(--transition-base);
}

.btn-outline:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */

.experience {
    background: linear-gradient(180deg, #fff 0%, #f5f7fa 100%);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
}

.timeline-item {
    margin-bottom: var(--spacing-3xl);
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: 0;
    margin-right: auto;
    padding-right: var(--spacing-2xl);
    text-align: right;
    width: calc(50% - 30px);
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
    margin-right: 0;
    padding-left: var(--spacing-2xl);
    text-align: left;
    width: calc(50% - 30px);
}

.timeline-marker {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 50%;
    z-index: 1;
}

.timeline-date {
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.timeline-title {
    font-size: var(--size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

.timeline-description {
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   QUOTE SECTION
   ============================================ */

.quote-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
}

.quote-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    text-align: center;
}

.quote {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.quote cite {
    font-size: var(--size-lg);
    font-style: normal;
    opacity: 0.9;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact {
    background: linear-gradient(180deg, #f5f7fa 0%, #fff 100%);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    color: white;
    flex-shrink: 0;
}

.contact-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.contact-label {
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-value {
    font-size: var(--size-base);
    font-weight: 500;
    color: var(--color-accent);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md) 0;
    background: transparent;
    border: none;
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
    font-family: var(--font-body);
    font-size: var(--size-base);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
    resize: none;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-bottom-color: var(--color-accent);
}

.form-group label {
    position: absolute;
    top: var(--spacing-md);
    left: 0;
    font-size: var(--size-base);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    pointer-events: none;
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: -var(--spacing-lg);
    font-size: var(--size-sm);
    color: var(--color-accent);
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.form-group input:focus ~ .form-line,
.form-group textarea:focus ~ .form-line {
    width: 100%;
}

.submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: var(--size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    font-size: var(--size-2xl);
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    font-size: var(--size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    font-size: var(--size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-column a {
    display: block;
    font-size: var(--size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    font-size: var(--size-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-credit {
    margin-top: var(--spacing-sm);
}

/* ============================================
   UTILITIES
   ============================================ */

.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
    transition: all var(--transition-base);
}

.hero-fade-up {
    opacity: 0;
    transform: translateY(20px);
}

.hero-fade-up.animate {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }