/* ==========================================================================
   1. CSS VARIABLES (Apple-Inspired Design Tokens)
   ========================================================================== */
:root {
    /* Light Theme */
    --bg-base: #fbfbfd;
    --bg-surface: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --border-color: rgba(0, 0, 0, 0.08);
    --accent: #2997ff;
    --accent-hover: #0071e3;
    --accent-soft: rgba(41, 151, 255, 0.1);

    /* Fluid Spacing */
    --space-xs: clamp(0.5rem, 1vw, 0.75rem);
    --space-sm: clamp(1rem, 2vw, 1.5rem);
    --space-md: clamp(2rem, 4vw, 3rem);
    --space-lg: clamp(4rem, 8vw, 6rem);

    /* Fluid Typography */
    --font-size-sm: clamp(0.875rem, 1vw, 0.95rem);
    --font-size-base: clamp(1rem, 1.2vw, 1.125rem);
    --font-size-lg: clamp(1.25rem, 2vw, 1.5rem);
    --font-size-xl: clamp(1.75rem, 3vw, 2.5rem);
    --font-size-xxl: clamp(2.5rem, 5vw, 4.5rem);

    /* UI Tokens */
    --transition-fast: 0.2s cubic-bezier(0.25, 1, 0.5, 1);
    --transition-smooth: 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.08);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

/* Dark Mode Theme */
.theme-dark {
    --bg-base: #000000;
    --bg-surface: #1c1c1e;
    --bg-glass: rgba(28, 28, 30, 0.75);
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --border-color: rgba(255, 255, 255, 0.1);
    --accent: #0a84ff;
    --accent-hover: #409cff;
    --accent-soft: rgba(10, 132, 255, 0.15);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   2. GLOBAL RESET & BASE TYPOGRAPHY
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

/* ==========================================================================
   3. UTILITIES & COMPONENTS
   ========================================================================== */
.max-width {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* Apple-style Glassmorphism */
.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
}

/* Premium Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 980px; /* Perfect pill shape */
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-base);
}

.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-hover);
}

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

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

/* ==========================================================================
   4. NAVIGATION
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    z-index: 100;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-smooth);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: var(--font-size-base);
    letter-spacing: -0.02em;
}

.logo-mark {
    background: var(--text-primary);
    color: var(--bg-base);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
    transition: color var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: color var(--transition-fast);
}

.icon-btn:hover {
    color: var(--text-primary);
}

/* Mobile Navigation */
.mobile-only { display: none; }

.mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    padding: var(--space-sm);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: all var(--transition-smooth);
}

.mobile-menu.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.mobile-link {
    display: block;
    padding: 1rem;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

.mobile-link:last-child { border-bottom: none; }

@media (max-width: 768px) {
    .desktop-only { display: none; }
    .mobile-only { display: block; }
}

/* ==========================================================================
   5. GLOBAL SECTION LAYOUTS
   ========================================================================== */
.section {
    padding: var(--space-lg) 0;
    position: relative;
    z-index: 1;
}

.section-alternate {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto calc(var(--space-md) * 1.5);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

/* ==========================================================================
   6. HERO SECTION
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 60px; /* Offset for navbar */
    overflow: hidden;
}

.hero-container {
    position: relative;
    z-index: 2;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Abstract Ambient Glows (Apple iOS Style) */
.hero-glow {
    position: absolute;
    width: 50vw;
    height: 50vw;
    max-width: 600px;
    max-height: 600px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    z-index: 0;
    pointer-events: none;
    animation: pulseGlow 8s infinite alternate ease-in-out;
}

.glow-primary {
    top: -10%;
    right: -10%;
    background: radial-gradient(circle, rgba(10,132,255,0.4) 0%, rgba(0,0,0,0) 70%);
}

.glow-secondary {
    bottom: -10%;
    left: -10%;
    background: radial-gradient(circle, rgba(94,92,230,0.4) 0%, rgba(0,0,0,0) 70%);
}

/* Hero Content */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 99px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-soft);
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #34c759;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(52, 199, 89, 0.5);
    animation: blink 2s infinite ease-in-out;
}

.hero-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: var(--space-sm);
}

.hero-greeting {
    display: block;
    color: var(--text-primary);
}

.hero-highlight {
    display: block;
    background: linear-gradient(135deg, var(--accent) 0%, #5e5ce6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-md);
    line-height: 1.4;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.hero-social {
    display: flex;
    gap: 1.5rem;
    font-size: 1.75rem;
    color: var(--text-secondary);
}

.hero-social a {
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.hero-social a:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* ==========================================================================
   7. SKILLS SECTION
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-sm);
}

.skill-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    transition: all var(--transition-smooth);
}

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

.skill-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--accent-soft);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    transition: transform var(--transition-fast);
}

.skill-card:hover .skill-icon {
    transform: scale(1.1);
}

.skill-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 1rem;
}

.skill-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.chip {
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==========================================================================
   8. ANIMATION CLASSES (Performance Optimized)
   ========================================================================== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

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

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

@keyframes pulseGlow {
    0% { transform: scale(1); opacity: 0.3; }
    100% { transform: scale(1.1); opacity: 0.5; }
}

@media (max-width: 600px) {
    .hero-cta { flex-direction: column; width: 100%; max-width: 300px; }
    .hero-cta .btn { width: 100%; }
}

/* ==========================================================================
   9. PROJECTS SECTION
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.project-card {
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-smooth);
}

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

.project-visual {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    position: relative;
    overflow: hidden;
}

/* Apple-style Abstract Gradients */
.visual-1 { background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%); }
.visual-2 { background: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%); }
.visual-3 { background: linear-gradient(135deg, #a1c4fd 0%, #c2e9fb 100%); }
.visual-4 { background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 99%, #fecfef 100%); }

.project-visual i {
    transition: transform var(--transition-smooth);
}

.project-card:hover .project-visual i {
    transform: scale(1.15);
}

.project-content {
    padding: var(--space-sm);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

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

.btn-icon {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--text-primary);
    color: var(--bg-base);
}

.btn-primary-soft {
    background: var(--accent-soft);
    color: var(--accent);
    border: none;
}

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

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

.btn-text {
    font-size: var(--font-size-base);
    color: var(--accent);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-text:hover {
    text-decoration: underline;
}

/* ==========================================================================
   10. EXPERIENCE TIMELINE
   ========================================================================== */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 7px;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-md);
}

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 1.5rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 4px solid var(--bg-base);
    box-shadow: 0 0 0 2px var(--accent-soft);
    z-index: 2;
}

.timeline-content {
    padding: var(--space-sm);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast);
}

.timeline-content:hover {
    transform: translateX(4px);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-role {
    font-size: 1.25rem;
    font-weight: 700;
}

.timeline-company {
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--bg-base);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    border: 1px solid var(--border-color);
}

.timeline-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.timeline-list li {
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.25rem;
}

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

/* ==========================================================================
   11. EDUCATION SECTION
   ========================================================================== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-sm);
}

.edu-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
}

.edu-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.edu-degree {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.edu-school {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.edu-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    font-weight: 600;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.edu-year { color: var(--text-secondary); }
.edu-score { color: var(--accent); }
.edu-link { color: var(--accent); text-decoration: underline; }

/* ==========================================================================
   12. CONTACT SECTION & FORMS
   ========================================================================== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-lg);
    align-items: center;
}

@media (max-width: 900px) {
    .contact-container {
        grid-template-columns: 1fr;
    }
}

.contact-desc {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-link-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.contact-link-item i {
    font-size: 1.5rem;
    color: var(--text-secondary);
    background: var(--bg-surface);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.contact-link-item:hover {
    transform: translateX(8px);
    color: var(--accent);
}

.contact-form-wrapper {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
}

.custom-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 1rem;
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.btn-full { width: 100%; }

/* ==========================================================================
   13. FOOTER
   ========================================================================== */
.footer {
    padding: var(--space-sm) 0;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-name {
    font-weight: 700;
}

.footer-role {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 0.5rem;
    border-left: 1px solid var(--border-color);
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    .footer-role {
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-left: 0;
        padding-top: 0.25rem;
        margin-top: 0.25rem;
        display: block;
    }
}