/* ============================================
   ARIAN TORSHIZI - PORTFOLIO
   Refined Professional Design
   ============================================ */

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

:root {
    /* Sophisticated dark palette */
    --bg-primary: #0c0f16;
    --bg-secondary: #12161f;
    --bg-card: #181d28;
    --bg-elevated: #1e2433;
    
    /* Refined accent colors */
    --accent-primary: #64b5f6;
    --accent-secondary: #7c4dff;
    --accent-tertiary: #00e5ff;
    --accent-warm: #ff6b9d;
    
    /* Text hierarchy */
    --text-primary: #f4f6f9;
    --text-secondary: #a8b2c1;
    --text-tertiary: #6b7788;
    
    /* Borders & surfaces */
    --border-subtle: rgba(100, 181, 246, 0.08);
    --border-hover: rgba(100, 181, 246, 0.2);
    --glass-bg: rgba(18, 22, 31, 0.8);
    --glass-border: rgba(100, 181, 246, 0.12);
    
    /* Shadows */
    --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);
    --shadow-glow: 0 0 60px rgba(100, 181, 246, 0.15);
    
    /* Spacing system */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Typography imports */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle background texture */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(100, 181, 246, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 100% 0%, rgba(124, 77, 255, 0.06), transparent),
        radial-gradient(ellipse 50% 30% at 0% 100%, rgba(0, 229, 255, 0.04), transparent);
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.4s var(--ease-out-expo);
}

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

.logo {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 2px;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { 
        opacity: 1;
        box-shadow: 0 0 8px var(--accent-primary);
    }
    50% { 
        opacity: 0.6;
        box-shadow: 0 0 16px var(--accent-primary);
    }
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 1px;
    transition: width 0.4s var(--ease-out-expo);
}

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

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 8rem var(--space-lg) var(--space-xl);
    overflow: hidden;
}

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

.hero-bg::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(100, 181, 246, 0.1) 0%, transparent 70%);
    animation: hero-pulse 8s ease-in-out infinite;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(100, 181, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(100, 181, 246, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 60% 50% at 50% 30%, black, transparent);
    -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 30%, black, transparent);
}

@keyframes hero-pulse {
    0%, 100% { 
        transform: translateX(-50%) scale(1);
        opacity: 0.5;
    }
    50% { 
        transform: translateX(-50%) scale(1.1);
        opacity: 0.8;
    }
}

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

.hero-title {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
    background: linear-gradient(
        135deg,
        var(--text-primary) 0%,
        var(--accent-primary) 50%,
        var(--accent-tertiary) 100%
    );
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-shift 8s ease infinite, title-enter 1s var(--ease-out-expo) backwards;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes title-enter {
    from {
        opacity: 0;
        transform: translateY(40px);
        filter: blur(10px);
    }
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: var(--space-xl);
    animation: subtitle-enter 1s var(--ease-out-expo) 0.15s backwards;
}

@keyframes subtitle-enter {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
}

.hero-tags {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-xl);
    animation: tags-enter 1s var(--ease-out-expo) 0.3s backwards;
}

@keyframes tags-enter {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
}

.tag {
    padding: 0.625rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 100px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
    transition: all 0.3s ease;
}

.tag:hover {
    background: var(--bg-elevated);
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.cta-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: cta-enter 1s var(--ease-out-expo) 0.45s backwards;
}

@keyframes cta-enter {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    text-decoration: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.4s var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-primary);
    border: none;
    box-shadow: 
        0 4px 20px rgba(100, 181, 246, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 8px 32px rgba(100, 181, 246, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:active {
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

.btn-link {
    background: var(--accent-secondary);
    color: white;
    border: none;
}

.btn-link:hover {
    background: var(--accent-warm);
    transform: translateY(-2px);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: var(--space-2xl) var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.page-section {
    min-height: calc(100vh - 200px);
    padding-top: 8rem;
}

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

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ============================================
   PROJECTS GRID
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.5s var(--ease-out-expo);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(100, 181, 246, 0.05) 0%,
        transparent 50%
    );
    opacity: 0;
    transition: opacity 0.4s ease;
}

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

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

.project-content {
    padding: var(--space-md);
    position: relative;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

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

.project-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.65;
    margin-bottom: var(--space-sm);
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-tag {
    padding: 0.375rem 0.875rem;
    background: rgba(100, 181, 246, 0.15);
    border: 1px solid rgba(100, 181, 246, 0.25);
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.project-tag.ai {
    background: rgba(156, 136, 255, 0.15);
    border-color: rgba(156, 136, 255, 0.25);
    color: #a78bfa;
}

.project-tag.embedded {
    background: rgba(52, 211, 153, 0.15);
    border-color: rgba(52, 211, 153, 0.25);
    color: #34d399;
}

/* ============================================
   MODAL
   ============================================ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(12, 15, 22, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 2000;
    overflow-y: auto;
    padding: var(--space-lg);
}

.modal-overlay.active {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    animation: modal-bg-enter 0.4s var(--ease-out-expo);
}

@keyframes modal-bg-enter {
    from { opacity: 0; }
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 24px;
    max-width: 900px;
    width: 100%;
    margin: var(--space-xl) auto;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    animation: modal-enter 0.5s var(--ease-out-back);
}

@keyframes modal-enter {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.96);
    }
}

.modal-header {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.modal-close {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: rgba(255, 107, 157, 0.15);
    border-color: var(--accent-warm);
    color: var(--accent-warm);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--space-lg);
    color: var(--text-secondary);
    line-height: 1.8;
}

.modal-body p {
    margin-bottom: var(--space-md);
}

.modal-images {
    display: flex;
    gap: var(--space-sm);
    overflow-x: auto;
    padding: var(--space-sm) 0;
    margin: var(--space-md) 0;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) var(--bg-card);
}

.modal-images img {
    max-height: 350px;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.modal-images-tall {
    display: flex;
    gap: var(--space-sm);
    overflow-x: auto;
    padding: var(--space-sm) 0;
    margin: var(--space-md) 0;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) var(--bg-card);
}

.modal-images-tall img {
    max-height: 550px;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    flex-shrink: 0;
}


.modal-images::-webkit-scrollbar {
    height: 6px;
}

.modal-images::-webkit-scrollbar-track {
    background: var(--bg-card);
    border-radius: 3px;
}

.modal-images::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 3px;
}

.modal-images img {
    max-height: 350px;
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.modal-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-xl);
    align-items: start;
}

.about-text h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.education-item {
    margin-bottom: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.education-item strong {
    color: var(--accent-primary);
    font-weight: 600;
    display: block;
}

.education-school {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.skill-category {
    background: var(--bg-card);
    padding: var(--space-md);
    border-radius: 16px;
    border: 1px solid var(--border-subtle);
    transition: all 0.3s ease;
}

.skill-category:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.skill-category h3 {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--accent-primary);
    letter-spacing: -0.01em;
}

.skill-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-item {
    padding: 0.375rem 0.875rem;
    background: rgba(100, 181, 246, 0.08);
    border: 1px solid rgba(100, 181, 246, 0.15);
    border-radius: 8px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.skill-item:hover {
    background: rgba(100, 181, 246, 0.15);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.contact-card {
    background: var(--bg-card);
    padding: var(--space-lg);
    border-radius: 20px;
    text-align: center;
    border: 1px solid var(--border-subtle);
    transition: all 0.4s var(--ease-out-expo);
}

.contact-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-6px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.contact-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    box-shadow: 0 8px 24px rgba(100, 181, 246, 0.25);
    color: var(--bg-primary);
}

.contact-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--bg-primary);
}

.contact-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-card p,
.contact-card a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.3s ease;
}

.contact-card a:hover {
    color: var(--accent-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    text-align: center;
    padding: var(--space-lg);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    font-size: 0.875rem;
    position: relative;
    z-index: 1;
}

/* ============================================
   ANIMATIONS
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--ease-out-expo);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.fade-in:nth-child(1) { transition-delay: 0s; }
.fade-in:nth-child(2) { transition-delay: 0.08s; }
.fade-in:nth-child(3) { transition-delay: 0.16s; }
.fade-in:nth-child(4) { transition-delay: 0.24s; }
.fade-in:nth-child(5) { transition-delay: 0.32s; }
.fade-in:nth-child(6) { transition-delay: 0.4s; }
.fade-in:nth-child(7) { transition-delay: 0.48s; }
.fade-in:nth-child(8) { transition-delay: 0.56s; }
.fade-in:nth-child(9) { transition-delay: 0.64s; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .skills-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2.5rem;
        --space-2xl: 4rem;
    }
    
    .nav-container {
        padding: 0 var(--space-sm);
    }
    
    .nav-links {
        gap: var(--space-sm);
    }

    .nav-links a {
        font-size: 0.75rem;
    }

    .skills-container {
        grid-template-columns: 1fr;
    }

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

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .modal-content {
        margin: var(--space-md) auto;
        border-radius: 20px;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--space-md);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 6rem var(--space-sm) var(--space-lg);
    }
    
    .hero-tags {
        gap: 0.5rem;
    }
    
    .tag {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
}

/* ============================================
   SELECTION & FOCUS
   ============================================ */
::selection {
    background: rgba(100, 181, 246, 0.3);
    color: var(--text-primary);
}

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

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}