/* ====================================
   DARK PORTFOLIO THEME - CSS RESET & BASE
   ==================================== */

:root {
    /* Dark Portfolio Color Palette */
    --color-bg-primary: #0a0e17;
    --color-bg-secondary: #141923;
    --color-bg-card: #1a1f2e;
    --color-bg-hover: #222838;

    --color-accent-primary: #01baef;
    --color-accent-secondary: #f04208;
    --color-accent-hover: #0295c7;

    --color-text-primary: #e4e6eb;
    --color-text-secondary: #b0b3b8;
    --color-text-muted: #8a8d91;

    --color-border: #2a2f3e;
    --color-border-light: #3a3f4e;

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

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-display: 'Georgia', serif;
    --font-mono: 'Courier New', monospace;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(1, 186, 239, 0.3);
}

* {
    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;
    min-height: 100vh;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

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

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

/* ====================================
   HEADER & NAVIGATION
   ==================================== */

.site-header {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, transparent 100%);
    padding: var(--spacing-lg) var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.profile-image {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    border: 3px solid var(--color-accent-primary);
    object-fit: cover;
    box-shadow: var(--shadow-glow);
    transition: transform var(--transition-normal);
}

.profile-image:hover {
    transform: scale(1.05);
}

.header-text {
    flex: 1;
}

.site-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    color: var(--color-accent-primary);
    margin: 0;
    text-shadow: 0 0 30px rgba(1, 186, 239, 0.5);
    letter-spacing: 0.05em;
}

.site-subtitle {
    color: var(--color-text-secondary);
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin: 0;
}

.main-nav {
    max-width: 1200px;
    margin: 0 auto;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.main-nav a {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.main-nav a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent-primary);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

.main-nav a:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.main-nav a:hover::before {
    transform: translateX(0);
}

.main-nav a.active {
    color: var(--color-accent-primary);
    background: var(--color-bg-card);
}

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

.hero-section {
    min-height: calc(100vh - 300px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    min-height: 500px;
    text-align: center;
    position: relative;
    z-index: 1;
    background-image: url('../img/index/option4.jpg');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-accent-primary);

}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);  
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

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

.content-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.page-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--color-text-primary);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
    border-radius: var(--radius-sm);
}

/* ====================================
   PROJECT GRID
   ==================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

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

.project-header {
    position: relative;
}

.project-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: var(--color-bg-secondary);
    border-bottom: 2px solid var(--color-border);
    margin: 0;
}

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

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

.project-title-block {
    padding: var(--spacing-md);
    background: linear-gradient(180deg, var(--color-bg-card) 0%, transparent 100%);
}

.project-title-block h3 {
    color: var(--color-text-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.project-subtitle {
    color: var(--color-accent-primary);
    font-size: 0.875rem;
    font-weight: 500;
    margin: 0;
}

.project-content {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-content p {
    flex: 1;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* ====================================
   PROJECT LINKS & BUTTONS
   ==================================== */

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

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-link img {
    width: 18px;
    height: 18px;
    object-fit: contain;
}

.btn-link:hover {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* ====================================
   PROJECT DETAILS & GALLERIES
   ==================================== */

.project-details {
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
}

.project-details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: color var(--transition-fast);
    user-select: none;
}

.project-details summary::-webkit-details-marker {
    display: none;
}

.project-details summary::before {
    content: '▶';
    display: inline-block;
    transition: transform var(--transition-fast);
    color: var(--color-accent-primary);
}

.project-details[open] summary::before {
    transform: rotate(90deg);
}

.project-details summary:hover {
    color: var(--color-accent-primary);
}

.project-details ul {
    margin-top: var(--spacing-md);
    padding-left: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.project-details li {
    margin-bottom: var(--spacing-xs);
}

/* Gallery */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.gallery img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    transition: transform var(--transition-normal);
    cursor: pointer;
}

.gallery img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Video Wrapper */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 */
    height: 0;
    overflow: hidden;
    margin-top: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--radius-md);
}

/* Chess Board Special Styling */
.chess-board {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
}

.chess-board img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

/* ====================================
   RESUME PAGE
   ==================================== */

.resume-page {
    min-height: calc(100vh - 400px);
}

.resume-container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
}

#resume-pdf {
    width: 100%;
    min-height: 1000px;
    border: none;
    border-radius: var(--radius-md);
    background: white;
}

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

.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: var(--spacing-xxl);
}

.social-links {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.social-links a:hover {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.social-links img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    filter: brightness(0.9);
    transition: filter var(--transition-fast);
}

.social-links a:hover img {
    filter: brightness(1.2);
}

/* ====================================
   RESPONSIVE DESIGN
   ==================================== */

@media (max-width: 768px) {
    .site-header {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .header-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }

    .profile-image {
        width: 60px;
        height: 60px;
    }

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

    .main-nav ul {
        gap: var(--spacing-xs);
    }

    .main-nav a {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
    }

    .hero-section {
        min-height: auto;
        padding: var(--spacing-xl) var(--spacing-sm);
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

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

    .social-links a {
        width: 48px;
        height: 48px;
    }

    .social-links img {
        width: 28px;
        height: 28px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

/* ====================================
   ANIMATIONS & LOADING STATES
   ==================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.project-card {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.project-card:nth-child(1) {
    animation-delay: 0.1s;
}

.project-card:nth-child(2) {
    animation-delay: 0.2s;
}

.project-card:nth-child(3) {
    animation-delay: 0.3s;
}

.project-card:nth-child(4) {
    animation-delay: 0.4s;
}

.project-card:nth-child(5) {
    animation-delay: 0.5s;
}

.project-card:nth-child(6) {
    animation-delay: 0.6s;
}

/* ====================================
   UTILITY CLASSES
   ==================================== */

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

.mt-1 {
    margin-top: var(--spacing-xs);
}

.mt-2 {
    margin-top: var(--spacing-sm);
}

.mt-3 {
    margin-top: var(--spacing-md);
}

.mt-4 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-xs);
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.mb-3 {
    margin-bottom: var(--spacing-md);
}

.mb-4 {
    margin-bottom: var(--spacing-lg);
}

/* ====================================
   ACCESSIBILITY
   ==================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

*:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}