/* ═══════════════════════════════════════════
   Executive Dark Mode — Design System
   ═══════════════════════════════════════════ */

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

:root {
    --bg-primary: #09090b;
    --bg-secondary: #131316;
    --bg-tertiary: #1a1a1f;
    --bg-card: rgba(255,255,255,0.03);
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-soft: rgba(99,102,241,0.12);
    --accent-warm: #f59e0b;
    --text-primary: #f0f0f2;
    --text-secondary: #a1a1aa;
    --text-muted: #52525b;
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);
    --glass: rgba(255,255,255,0.04);
    --glass-border: rgba(255,255,255,0.08);
    --gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
    --gradient-text: linear-gradient(135deg, #818cf8, #a78bfa);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 60px rgba(99,102,241,0.08);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Ambient background orb */
body::before {
    content: '';
    position: fixed;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99,102,241,0.08) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
    animation: ambientFloat 20s ease-in-out infinite alternate;
}
body::after {
    content: '';
    position: fixed;
    bottom: -20%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(139,92,246,0.06) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
    animation: ambientFloat 25s ease-in-out infinite alternate-reverse;
}

@keyframes ambientFloat {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(40px, -30px) scale(1.1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    position: relative;
    z-index: 1;
}

/* ─── NAVIGATION ─── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(9,9,11,0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    z-index: 1000;
    transition: all var(--transition);
}

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

.nav-brand {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-brand span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    position: relative;
    transition: color var(--transition);
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    border-radius: 1px;
    transition: width var(--transition);
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

/* Mobile hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ─── HERO ─── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    position: relative;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent-soft);
    border: 1px solid rgba(99,102,241,0.2);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-light);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
}

.hero-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: statusPulse 2s ease-in-out infinite;
}

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

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.hero h1 .highlight {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 540px;
    line-height: 1.8;
    font-weight: 400;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Profile card */
.profile-card {
    display: flex;
    justify-content: center;
}

.profile-card-inner {
    position: relative;
    padding: 32px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    text-align: center;
    max-width: 300px;
    width: 100%;
}

.profile-card-inner::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-xl);
    background: var(--gradient);
    z-index: -1;
    opacity: 0.15;
}

.profile-img {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid rgba(99,102,241,0.3);
    margin-bottom: 20px;
    box-shadow: 0 0 40px rgba(99,102,241,0.15);
}

.profile-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.profile-role {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* ─── BUTTONS ─── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 2px 12px rgba(99,102,241,0.3);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(99,102,241,0.4);
}

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

/* ─── STATS ─── */
.stats {
    padding: 48px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 24px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.stat-item:hover {
    border-color: var(--border-hover);
    background: var(--glass);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* ─── SECTIONS ─── */
section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    margin-bottom: 60px;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
    display: block;
    text-transform: uppercase;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

/* ─── CASE STUDIES ─── */
.case-studies { display: grid; gap: 32px; }

.case-study {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    position: relative;
    overflow: hidden;
    transition: all var(--transition);
}

.case-study::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient);
    opacity: 0;
    transition: opacity var(--transition);
}

.case-study:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}
.case-study:hover::before { opacity: 1; }

.case-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    display: block;
}

.case-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent-soft);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-light);
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.case-badge i { font-size: 0.8rem; }

.case-study h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.case-study-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 20px;
}

.case-description {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

.case-description strong {
    color: var(--text-primary);
    font-weight: 600;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.tech-tag {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-weight: 500;
    transition: all var(--transition);
}

.tech-tag:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

/* Accordion for diagrams */
.diagram-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}
.diagram-toggle:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}
.diagram-toggle .arrow {
    transition: transform var(--transition);
    font-size: 0.7rem;
}
.diagram-toggle.active .arrow {
    transform: rotate(180deg);
}

.diagram-container {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, margin 0.4s ease, padding 0.4s ease;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-top: 0;
    padding: 0 24px;
}
.diagram-container.open {
    max-height: 500px;
    margin-top: 16px;
    padding: 24px;
}

/* ─── SKILLS ─── */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: all var(--transition);
}

.skill-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.skill-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 1.1rem;
    color: var(--accent-light);
}

.skill-card h3 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

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

.skill-card li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.875rem;
}

.skill-card li::before {
    content: '›';
    color: var(--accent);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: -1px;
}

/* ─── TIMELINE ─── */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--accent) 0%, var(--border) 100%);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
    padding-left: 32px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -44px;
    top: 8px;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.timeline-company {
    font-size: 0.85rem;
    color: var(--accent-light);
    font-weight: 500;
}

.timeline-period {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.timeline-item ul {
    margin-top: 12px;
    list-style: none;
}

.timeline-item li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.925rem;
    padding-left: 16px;
    position: relative;
}

.timeline-item li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
}

.timeline-item li strong {
    color: var(--accent-light);
    font-weight: 600;
}

/* ─── PROJECTS ─── */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.project-card.featured {
    border-color: rgba(99,102,241,0.3);
    background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(139,92,246,0.03));
}

.project-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 1.2rem;
    color: var(--accent-light);
}

.project-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.project-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    font-size: 0.9rem;
    flex-grow: 1;
}

.project-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.825rem;
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition);
}

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

/* ─── CTA SECTION ─── */
.cta-section {
    padding: 80px 0;
    text-align: center;
}

.cta-box {
    background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(139,92,246,0.04));
    border: 1px solid rgba(99,102,241,0.15);
    border-radius: var(--radius-xl);
    padding: 60px 40px;
    max-width: 700px;
    margin: 0 auto;
}

.cta-box h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.cta-box p {
    color: var(--text-secondary);
    margin-bottom: 28px;
    font-size: 1rem;
}

/* ─── FOOTER ─── */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 48px 0 32px;
}

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

.footer-tagline {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    font-weight: 400;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 24px;
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: all var(--transition);
    text-decoration: none;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.social-links a:hover {
    color: var(--accent-light);
    border-color: var(--accent);
    background: var(--accent-soft);
    transform: translateY(-1px);
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ─── SCROLL REVEAL ─── */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .profile-card { order: -1; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    section { padding: 64px 0; }
    .hero { padding: 100px 0 48px; min-height: auto; }
    .nav-links { 
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(9,9,11,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px 32px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .stat-value { font-size: 2rem; }
    .hero h1 { font-size: clamp(2rem, 6vw, 2.8rem); }
    .case-study { padding: 24px; }
    .projects-grid { grid-template-columns: 1fr; }
    .timeline { padding-left: 24px; }
    .timeline-item { padding-left: 20px; }
    .timeline-item::before { left: -28px; }
    .cta-box { padding: 40px 24px; }
    .section-header { margin-bottom: 40px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .stat-item { padding: 16px 12px; }
    .stat-value { font-size: 1.75rem; }
    .hero-cta { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}

/* FontAwesome fix */
i.fas, i.fab, i.fa {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    -webkit-font-smoothing: antialiased;
}