/* ============================
   Apple-Inspired Portfolio CSS
   ============================ */

:root {
    --primary: #0071e3;
    --primary-dark: #0077ed;
    --accent: #bf5af2;
    --accent-secondary: #ff375f;
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #2d2d2f;
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --text-tertiary: #6e6e73;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-text: linear-gradient(90deg, #0071e3, #bf5af2, #ff375f);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition-fast: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-base: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: var(--primary);
    color: white;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ============================
   Navigation
   ============================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition-base);
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: var(--transition-fast);
}

.nav-logo:hover {
    color: var(--primary);
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition-base);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-base);
}

/* ============================
   Hero Section
   ============================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(-30px, -20px) scale(1.02); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-tag {
    display: inline-block;
    padding: 8px 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    line-height: 1.1;
}

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

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.stat-suffix {
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 4px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 100px;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 24px rgba(0, 113, 227, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 113, 227, 0.5);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

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

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-tertiary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* Fade-in Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================
   Sections
   ============================ */
.section {
    padding: 120px 0;
    position: relative;
}

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

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}

/* ============================
   About Section
   ============================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-lead {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.highlight-card {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.highlight-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(8px);
}

.highlight-icon {
    font-size: 2rem;
}

.highlight-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.highlight-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.highlight-meta {
    font-size: 0.75rem;
    color: var(--primary);
}

/* Code Window */
.code-window {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--glass-border);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--glass-border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.code-title {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.code-content {
    padding: 24px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content .keyword { color: #ff79c6; }
.code-content .class-name { color: #8be9fd; }
.code-content .function { color: #50fa7b; }
.code-content .string { color: #f1fa8c; }

/* ============================
   Skills Section
   ============================ */
.skills {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

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

.skill-category {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-text);
    opacity: 0;
    transition: var(--transition-base);
}

.skill-category:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.skill-category:hover::before {
    opacity: 1;
}

.skill-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    color: var(--primary);
}

.skill-icon svg {
    width: 24px;
    height: 24px;
}

.skill-category h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    padding: 6px 12px;
    background: rgba(0, 113, 227, 0.1);
    border: 1px solid rgba(0, 113, 227, 0.2);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--primary);
    transition: var(--transition-fast);
}

.skill-tag:hover {
    background: rgba(0, 113, 227, 0.2);
    transform: scale(1.05);
}

/* ============================
   Experience Section
   ============================ */
.experience {
    background: var(--bg-secondary);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--accent), var(--accent-secondary));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-left: 48px;
    padding-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--bg-secondary);
    border: 3px solid var(--primary);
    border-radius: 50%;
    transition: var(--transition-base);
}

.timeline-item:hover .timeline-marker {
    background: var(--primary);
    box-shadow: 0 0 20px rgba(0, 113, 227, 0.5);
}

.timeline-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition-base);
}

.timeline-item:hover .timeline-content {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(8px);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.timeline-title h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-title .company {
    color: var(--primary);
    font-weight: 500;
}

.timeline-meta {
    text-align: right;
}

.timeline-meta .location {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.timeline-meta .date {
    display: block;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    margin-top: 4px;
}

.timeline-achievements {
    list-style: none;
    margin-bottom: 20px;
}

.timeline-achievements li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.timeline-achievements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

.timeline-achievements li strong {
    color: var(--text-primary);
}

.timeline-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-tech span {
    padding: 4px 12px;
    background: rgba(0, 113, 227, 0.1);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--primary);
}

/* ============================
   Projects Section
   ============================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

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

@media (max-width: 1024px) {
    .projects-grid-large {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .projects-grid-large {
        grid-template-columns: 1fr;
    }
}

.project-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition-base);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.project-card:hover .project-link {
    color: var(--primary);
}

.project-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 1.5rem;
    background: var(--glass-bg);
    padding: 8px;
    border-radius: var(--radius-sm);
    backdrop-filter: blur(10px);
}

.project-link {
    margin-top: 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.project-image {
    height: 240px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
}

.project-visual {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

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

.flow-node {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.flow-node.source {
    background: rgba(0, 113, 227, 0.2);
    color: var(--primary);
    border: 1px solid rgba(0, 113, 227, 0.3);
}

.flow-node.transform {
    background: rgba(191, 90, 242, 0.2);
    color: var(--accent);
    border: 1px solid rgba(191, 90, 242, 0.3);
}

.flow-node.dest {
    background: rgba(48, 209, 88, 0.2);
    color: #30d158;
    border: 1px solid rgba(48, 209, 88, 0.3);
}

.flow-arrow {
    width: 32px;
    height: 2px;
    background: var(--text-tertiary);
    position: relative;
}

.flow-arrow::after {
    content: '';
    position: absolute;
    right: 0;
    top: -4px;
    border: 5px solid transparent;
    border-left-color: var(--text-tertiary);
}

.project-visual.warehouse {
    flex-direction: column;
    gap: 8px;
}

.layer {
    width: 80%;
    padding: 16px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.layer.staging {
    background: rgba(0, 113, 227, 0.15);
    color: var(--primary);
    border: 1px solid rgba(0, 113, 227, 0.25);
}

.layer.intermediate {
    width: 90%;
    background: rgba(191, 90, 242, 0.15);
    color: var(--accent);
    border: 1px solid rgba(191, 90, 242, 0.25);
}

.layer.mart {
    width: 100%;
    background: rgba(48, 209, 88, 0.15);
    color: #30d158;
    border: 1px solid rgba(48, 209, 88, 0.25);
}

.project-content {
    padding: 32px;
}

.project-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tech span {
    padding: 6px 14px;
    background: rgba(0, 113, 227, 0.1);
    border: 1px solid rgba(0, 113, 227, 0.2);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--primary);
}

/* Streaming Visual */
.project-visual.streaming {
    flex-direction: column;
    gap: 16px;
}

.stream-line {
    width: 80%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-secondary));
    border-radius: 2px;
    position: relative;
    overflow: hidden;
}

.stream-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: stream 1.5s infinite;
}

@keyframes stream {
    to { left: 200%; }
}

.stream-dots {
    display: flex;
    gap: 8px;
}

.stream-dots span {
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse-dot 1s infinite;
}

.stream-dots span:nth-child(2) { animation-delay: 0.1s; background: var(--accent); }
.stream-dots span:nth-child(3) { animation-delay: 0.2s; }
.stream-dots span:nth-child(4) { animation-delay: 0.3s; background: var(--accent); }
.stream-dots span:nth-child(5) { animation-delay: 0.4s; }

@keyframes pulse-dot {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

/* Quality Check Visual */
.project-visual.quality {
    flex-direction: column;
}

.check-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.check {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1.25rem;
}

.check.pass {
    background: rgba(48, 209, 88, 0.2);
    color: #30d158;
    border: 1px solid rgba(48, 209, 88, 0.3);
}

.check.fail {
    background: rgba(255, 55, 95, 0.2);
    color: var(--accent-secondary);
    border: 1px solid rgba(255, 55, 95, 0.3);
}

/* Medallion Visual */
.project-visual.medallion {
    flex-direction: row;
    gap: 16px;
}

.medal {
    font-size: 2rem;
    animation: float-medal 3s ease-in-out infinite;
}

.medal.bronze { animation-delay: 0s; }
.medal.silver { animation-delay: 0.3s; }
.medal.gold { animation-delay: 0.6s; }

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

/* ============================
   Certifications Section
   ============================ */
.certifications {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

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

.cert-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.cert-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.cert-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.cert-icon.aws {
    background: linear-gradient(135deg, #ff9900 0%, #ffb84d 100%);
    color: white;
}

.cert-icon.google {
    background: linear-gradient(135deg, #4285f4 0%, #34a853 50%, #fbbc04 75%, #ea4335 100%);
    color: white;
}

.cert-icon.nosql {
    background: linear-gradient(135deg, #00684a 0%, #00ed64 100%);
    color: white;
}

.cert-icon svg {
    width: 28px;
    height: 28px;
}

.cert-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.cert-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ============================
   Contact Section
   ============================ */
.contact {
    background: var(--bg-secondary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.contact-content .section-tag {
    margin-bottom: 16px;
}

.contact-content .section-title {
    text-align: left;
    margin-bottom: 16px;
}

.contact-content > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: var(--transition-base);
}

.contact-link:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(8px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 113, 227, 0.1);
    border-radius: var(--radius-sm);
    color: var(--primary);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: 2px;
}

.contact-value {
    color: var(--text-primary);
    font-weight: 500;
}

/* Contact Card */
.contact-visual {
    display: flex;
    justify-content: center;
}

.contact-card {
    width: 100%;
    max-width: 360px;
    padding: 32px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--glass-border);
}

.avatar {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-text);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
}

.card-title h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.card-title span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.card-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.card-stat {
    text-align: center;
    padding: 16px;
    background: rgba(0, 113, 227, 0.05);
    border-radius: var(--radius-sm);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-desc {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.card-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: #30d158;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================
   Footer
   ============================ */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-content p {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

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

/* ============================
   Scroll Animations
   ============================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ============================
   Responsive Design
   ============================ */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .about-visual {
        order: -1;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cert-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .contact-content .section-title {
        text-align: center;
    }
    
    .contact-content > p {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 24px 60px;
    }
    
    .hero-stats {
        gap: 32px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 6px;
    }
    
    .timeline-marker {
        left: 0;
    }
    
    .timeline-item {
        padding-left: 40px;
    }
    
    .timeline-header {
        flex-direction: column;
    }
    
    .timeline-meta {
        text-align: left;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .data-flow {
        flex-direction: column;
    }
    
    .flow-arrow {
        width: 2px;
        height: 24px;
    }
    
    .flow-arrow::after {
        right: -4px;
        top: auto;
        bottom: 0;
        border: 5px solid transparent;
        border-top-color: var(--text-tertiary);
        border-left-color: transparent;
    }
}