:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: rgba(26, 26, 37, 0.6);
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    
    --accent-primary: #00d4aa;
    --accent-secondary: #0ea5e9;
    --accent-gradient: linear-gradient(135deg, #00d4aa 0%, #0ea5e9 100%);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(0, 212, 170, 0.3);
    
    --shadow-glow: 0 0 40px rgba(0, 212, 170, 0.15);
    
    --font-heading: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'Space Mono', monospace;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 62.5%;
}

body {
    font-family: var(--font-body);
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

/* Background Effects */
.page-bg {
    position: fixed;
    inset: 0;
    overflow: hidden;
    z-index: -1;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
}

.gradient-orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.4) 0%, transparent 70%);
    top: -150px;
    right: -150px;
}

.gradient-orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.4) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
}

/* Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation Bar */
.page-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 3rem;
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: color var(--transition-fast);
}

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

.nav-back i {
    font-size: 1.8rem;
}

.nav-title {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: var(--text-primary);
}

/* Project Page Styles */
.project-page {
    padding-top: 100px;
    padding-bottom: 6rem;
}

.project-header {
    text-align: center;
    margin-bottom: 4rem;
}

.project-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 1.3rem;
    color: var(--accent-primary);
    margin-bottom: 2rem;
    font-family: var(--font-mono);
}

.project-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

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

.project-subtitle {
    font-size: 1.8rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Video Section */
.video-section {
    margin-bottom: 4rem;
}

.video-wrapper {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-glow);
}

.video-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0.05;
    pointer-events: none;
}

.video-wrapper video {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 20px;
}

/* Actions */
.project-actions {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 1.4rem 2.8rem;
    font-family: var(--font-body);
    font-size: 1.5rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
}

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

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

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn i {
    font-size: 1.6rem;
}

/* Highlights Section */
.highlights-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.highlights-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-glow);
}

.highlights-card h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.highlights-card h3 i {
    color: var(--accent-primary);
}

.highlights-list {
    list-style: none;
    display: grid;
    gap: 1.2rem;
}

.highlights-list li {
    position: relative;
    padding-left: 2.5rem;
    font-size: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.highlights-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

/* Tech Stack */
.tech-stack {
    margin-top: 4rem;
    text-align: center;
}

.tech-stack h3 {
    font-size: 1.4rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
}

.tech-tags {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.tech-tag {
    padding: 0.6rem 1.6rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 1.3rem;
    color: var(--text-secondary);
}

/* ============================================
   CERTIFICATE GALLERY STYLES
   ============================================ */
.gallery-page {
    padding-top: 100px;
    padding-bottom: 6rem;
}

.gallery-header {
    text-align: center;
    margin-bottom: 5rem;
}

.gallery-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

.gallery-subtitle {
    font-size: 1.8rem;
    color: var(--text-secondary);
}

/* Certificate Grid */
.cert-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2.5rem;
}

.cert-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.cert-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.cert-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
}

.cert-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.cert-card:hover .cert-image img {
    transform: scale(1.05);
}

.cert-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 212, 170, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.cert-overlay i {
    font-size: 3rem;
    color: var(--bg-primary);
}

.cert-info {
    padding: 1.5rem 2rem;
}

.cert-name {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.cert-issuer {
    font-size: 1.3rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.cert-issuer i {
    color: var(--accent-primary);
    font-size: 1.2rem;
}

/* Category Sections */
.cert-category {
    margin-bottom: 5rem;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.category-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon i {
    font-size: 2rem;
    color: var(--bg-primary);
}

.category-title {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    color: var(--text-primary);
}

/* Footer */
.page-footer {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.page-footer p {
    font-size: 1.4rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 55%;
    }
    
    .project-title {
        font-size: 3rem;
    }
    
    .gallery-title {
        font-size: 3rem;
    }
    
    .project-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .page-nav {
        padding: 0 1.5rem;
    }
    
    .nav-title {
        display: none;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 50%;
    }
    
    .cert-gallery {
        grid-template-columns: 1fr;
    }
}