/* ===== Modern Portfolio Styles ===== */

/* Variables */
:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #0066ff;
    --color-accent-hover: #0052cc;
    --color-border: #e5e7eb;
    --color-shadow: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --max-width: 1200px;
    --header-height: 64px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #1a1a1a;
    --color-text: #e5e7eb;
    --color-text-secondary: #9ca3af;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-border: #2a2a2a;
    --color-shadow: rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-accent-hover);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
    z-index: 1000;
    transition: var(--transition);
}

[data-theme="dark"] .header {
    background: rgba(10, 10, 10, 0.9);
}

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

.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-text {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-accent);
    color: white;
    border-radius: 8px;
    font-weight: 700;
}

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

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--color-text);
}

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

/* Main Content */
.main-content {
    margin-top: var(--header-height);
}

/* Sections */
.section {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

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

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 102, 255, 0.3);
}

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

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    transform: translateY(-2px);
}

/* Hero Image */
.hero-image-wrapper {
    position: relative;
}

.profile-img {
    width: 100%;
    max-width: 400px;
    border-radius: 20px;
    box-shadow: 0 20px 40px var(--color-shadow);
}

.hero-stats {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-lg);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.stat {
    text-align: center;
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

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

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

.about-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: var(--spacing-md);
}

.skills-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.skill-category h3 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.skill-category li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 46px;
    top: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-bg);
}

.timeline-date {
    min-width: 100px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-align: right;
    padding-top: 5px;
}

.timeline-content {
    flex: 1;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

.company {
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* Projects Section */
.projects {
    background: var(--color-bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--color-bg);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 2px 10px var(--color-shadow);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--color-shadow);
}

.project-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

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

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

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.btn-play, .btn-view {
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-play:hover, .btn-view:hover {
    transform: scale(1.05);
    background: var(--color-accent-hover);
}

.btn-play svg {
    width: 20px;
    height: 20px;
}

.project-content {
    padding: var(--spacing-lg);
}

.project-badges {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-secondary);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-winner {
    background: #fef3c7;
    color: #92400e;
}

.badge-ios {
    background: #dbeafe;
    color: #1e40af;
}

.badge-second {
    background: #e0e7ff;
    color: #3730a3;
}

.badge-global {
    background: #dcfce7;
    color: #14532d;
}

[data-theme="dark"] .badge-winner {
    background: #92400e;
    color: #fef3c7;
}

[data-theme="dark"] .badge-ios {
    background: #1e40af;
    color: #dbeafe;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.project-description {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.project-tech span {
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

/* More Projects Card */
.project-more {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: white;
}

.project-content-centered {
    text-align: center;
    padding: var(--spacing-xl);
}

.project-content-centered h3 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.project-content-centered p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

/* Contact Section */
.contact {
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.contact-link:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px var(--color-shadow);
    border-color: var(--color-accent);
}

.contact-icon {
    font-size: 1.25rem;
}

/* Footer */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

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

/* Theme Toggle */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: rotate(20deg) scale(1.1);
}

.theme-icon {
    position: absolute;
    transition: var(--transition);
}

body:not([data-theme="dark"]) .theme-icon[data-theme="dark"] {
    opacity: 1;
}

body:not([data-theme="dark"]) .theme-icon[data-theme="light"] {
    opacity: 0;
}

body[data-theme="dark"] .theme-icon[data-theme="light"] {
    opacity: 1;
}

body[data-theme="dark"] .theme-icon[data-theme="dark"] {
    opacity: 0;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 2000;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-bg);
    border-radius: 16px;
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: var(--color-bg-secondary);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 10;
    transition: var(--transition);
}

.modal-close:hover {
    transform: rotate(90deg);
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
}

.video-player video {
    width: 100%;
    border-radius: 12px;
}

.video-info {
    padding: var(--spacing-md);
}

.video-playlist {
    max-height: 400px;
    overflow-y: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

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

    .hero-title {
        font-size: 2.5rem;
    }

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

    .timeline::before {
        left: 20px;
    }

    .timeline-item::before {
        left: 16px;
    }

    .timeline-date {
        display: none;
    }

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

    .contact-links {
        flex-direction: column;
    }

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

    .modal-body {
        grid-template-columns: 1fr;
    }
}