/* ============================================
   LUMBANI KUMWENDA — PORTFOLIO
   Master Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

/* ── Design Tokens ─────────────────────────── */
:root {
    /* Brand */
    --primary: #0EA5E9;
    --primary-light: #38BDF8;
    --primary-dark: #0369A1;
    --accent: #06B6D4;
    --accent-soft: #7DD3FC;

    /* Surfaces */
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.65);
    --surface-glass-strong: rgba(255, 255, 255, 0.85);
    --surface-elevated: #ffffff;
    --border-subtle: rgba(14, 165, 233, 0.12);
    --border-default: rgba(14, 165, 233, 0.22);

    /* Text */
    --text-primary: #0B1120;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --text-on-primary: #ffffff;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #0EA5E9, #06B6D4);
    --gradient-brand-reverse: linear-gradient(135deg, #06B6D4, #0EA5E9);
    --gradient-warm: linear-gradient(135deg, #0EA5E9, #7DD3FC, #BAE6FD);
    --gradient-hero: linear-gradient(120deg, #0EA5E9 0%, #0284C7 35%, #0EA5E9 70%, #22D3EE 100%);
    --gradient-text: linear-gradient(135deg, #0EA5E9, #06B6D4, #7DD3FC, #38BDF8);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-md: 0 4px 12px rgba(14,165,233,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(14,165,233,0.12), 0 4px 12px rgba(0,0,0,0.05);
    --shadow-xl: 0 24px 60px rgba(14,165,233,0.15), 0 8px 20px rgba(0,0,0,0.06);
    --shadow-glow: 0 0 30px rgba(14,165,233,0.15);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    /* Typography */
    --font-sans: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.75rem;
    --font-size-5xl: 3.5rem;
    --line-height-tight: 1.15;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* Background */
    --bg: #F7FAFC;
    --bg-pattern: radial-gradient(circle at 20% 30%, rgba(14,165,233,0.06) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(6,182,212,0.04) 0%, transparent 50%);

    /* Blobs */
    --blob-primary: rgba(14, 165, 233, 0.12);
    --blob-accent: rgba(6, 182, 212, 0.08);

    /* Misc */
    --particle-color: 14, 165, 233;
    --section-divider: rgba(14, 165, 233, 0.05);
    --noise-opacity: 0.012;

    /* Project thumb gradients */
    --thumb-1: linear-gradient(135deg, #dbeafe, #bae6fd);
    --thumb-2: linear-gradient(135deg, #cffafe, #a5f3fc);
    --thumb-3: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    --thumb-4: linear-gradient(135deg, #ecfeff, #dbeafe);
    --thumb-5: linear-gradient(135deg, #dbeafe, #bfdbfe);
    --thumb-6: linear-gradient(135deg, #eef2ff, #e0e7ff);
}

/* ── Dark Theme ────────────────────────────── */
[data-theme="dark"] {
    --bg: #060E1A;
    --surface: rgba(255,255,255,0.03);
    --surface-glass: rgba(255,255,255,0.05);
    --surface-glass-strong: rgba(255,255,255,0.08);
    --surface-elevated: rgba(255,255,255,0.05);
    --border-subtle: rgba(125, 211, 252, 0.08);
    --border-default: rgba(125, 211, 252, 0.18);
    --text-primary: #E2E8F0;
    --text-secondary: #94A3B8;
    --text-tertiary: #64748B;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
    --shadow-xl: 0 24px 60px rgba(0,0,0,0.5);
    --blob-primary: rgba(56, 189, 248, 0.08);
    --blob-accent: rgba(14, 165, 233, 0.06);
    --particle-color: 125, 211, 252;
    --bg-pattern: radial-gradient(circle at 20% 30%, rgba(56,189,248,0.04) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(14,165,233,0.03) 0%, transparent 50%);

    --thumb-1: linear-gradient(135deg, #0b2536, #0d2f45);
    --thumb-2: linear-gradient(135deg, #0b2a33, #0d3540);
    --thumb-3: linear-gradient(135deg, #0a2236, #0d2a4a);
    --thumb-4: linear-gradient(135deg, #0a2430, #0b2a3c);
    --thumb-5: linear-gradient(135deg, #0b2033, #0c2840);
    --thumb-6: linear-gradient(135deg, #0a1f2b, #0b2636);
}

/* ── Reset & Base ──────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
    border-radius: 4px;
}

::selection { background: var(--primary); color: #fff; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: 90px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    background-image: var(--bg-pattern);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: var(--line-height-normal);
    transition: background-color 0.4s ease, color 0.4s ease;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Ambient Blobs ─────────────────────────── */
body::before, body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
}
body::before {
    width: 500px; height: 500px;
    top: -160px; right: -120px;
    background: var(--blob-primary);
    animation: blob-drift-1 20s ease-in-out infinite alternate;
}
body::after {
    width: 400px; height: 400px;
    bottom: 8%; left: -160px;
    background: var(--blob-accent);
    animation: blob-drift-2 25s ease-in-out infinite alternate;
}
@keyframes blob-drift-1 {
    0% { transform: translate3d(0,0,0) scale(1); }
    100% { transform: translate3d(-100px,60px,0) scale(1.1); }
}
@keyframes blob-drift-2 {
    0% { transform: translate3d(0,0,0) scale(1); }
    100% { transform: translate3d(140px,-80px,0) scale(1.08); }
}

/* ── Noise Overlay ─────────────────────────── */
#noise-overlay {
    position: fixed; inset: 0; z-index: 9998;
    pointer-events: none; opacity: var(--noise-opacity);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat; background-size: 256px 256px;
}

/* ── Scrollbar ─────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-dark); }

/* ── Preloader ─────────────────────────────── */
#preloader {
    position: fixed; inset: 0; z-index: 9999;
    background: var(--bg);
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}
#preloader.hidden { opacity: 0; visibility: hidden; }
.loader-ring {
    width: 48px; height: 48px;
    border: 2px solid var(--border-subtle);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Particles ─────────────────────────────── */
#particles-canvas {
    position: fixed; inset: 0; z-index: 0; pointer-events: none;
}

/* ── Typography Utilities ──────────────────── */
.gradient-text {
    background: var(--gradient-text);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 5s ease-in-out infinite;
}
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ══════════════════════════════════════════════
   NAVBAR
   ══════════════════════════════════════════════ */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 1rem 2rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    background: transparent;
}
.navbar.scrolled {
    background: var(--surface-glass-strong);
    backdrop-filter: blur(24px) saturate(1.8);
    border-bottom: 1px solid var(--border-subtle);
    padding: 0.6rem 2rem;
}
.navbar .container {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
    font-size: 1.35rem; font-weight: 800;
    background: var(--gradient-hero);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: -0.02em;
    animation: logo-wave 6s ease-in-out infinite;
}
@keyframes logo-wave {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.nav-links { display: flex; gap: 2.5rem; list-style: none; }
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    position: relative;
    transition: color 0.3s;
    padding: 0.25rem 0;
}
.nav-links a::before {
    content: '';
    position: absolute;
    bottom: -2px; left: 0;
    width: 0; height: 2px;
    background: var(--gradient-brand);
    border-radius: 2px;
    transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::before, .nav-links a.active::before { width: 100%; }

.nav-cta {
    padding: 0.55rem 1.4rem;
    border-radius: var(--radius-full);
    background: var(--gradient-brand);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 14px rgba(14,165,233,0.25);
}
.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(14,165,233,0.35);
}

/* Theme toggle */
.theme-toggle {
    width: 40px; height: 40px;
    border-radius: var(--radius-sm);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--text-secondary);
    transition: all 0.3s; margin-right: 0.5rem; position: relative; overflow: hidden;
}
.theme-toggle:hover {
    color: var(--primary); border-color: var(--primary);
    transform: translateY(-2px);
}
.theme-toggle .icon-sun, .theme-toggle .icon-moon {
    position: absolute;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.theme-toggle .icon-sun { opacity: 0; transform: rotate(90deg) scale(0); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0); }

.hamburger {
    display: none; flex-direction: column; gap: 5px;
    cursor: pointer; background: none; border: none; padding: 5px;
}
.hamburger span {
    width: 24px; height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ── Mobile Menu ───────────────────────────── */
.mobile-menu {
    display: none;
    position: fixed; inset: 0; z-index: 999;
    background: var(--bg);
    backdrop-filter: blur(24px);
    flex-direction: column; align-items: center; justify-content: center;
    gap: 2.5rem;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-size-xl);
    font-weight: 600;
    transition: color 0.25s, transform 0.25s;
}
.mobile-menu a:hover { color: var(--primary); transform: translateY(-2px); }

/* ══════════════════════════════════════════════
   SECTION COMMON
   ══════════════════════════════════════════════ */
.section {
    position: relative; z-index: 1;
    padding: var(--space-4xl) 2rem;
    isolation: isolate;
}
.section .container { max-width: 1200px; margin: 0 auto; }

.section-label {
    display: inline-flex; align-items: center; gap: var(--space-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--primary);
    margin-bottom: var(--space-md);
}
.section-label .dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--primary);
    animation: pulse-dot 2.5s infinite;
}
@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 0 rgba(14,165,233,0.4); }
    50% { box-shadow: 0 0 0 8px rgba(14,165,233,0); }
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
}
.section-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    max-width: 560px;
    margin-bottom: var(--space-3xl);
    line-height: var(--line-height-relaxed);
}

/* ══════════════════════════════════════════════
   HERO SECTION
   ══════════════════════════════════════════════ */
.hero {
    min-height: 100vh;
    display: flex; align-items: center;
    padding-top: 100px;
    position: relative; overflow: hidden;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-4xl);
    align-items: center;
    position: relative; z-index: 1;
}
.hero-content { padding-right: var(--space-xl); }

.hero-badge {
    display: inline-flex; align-items: center; gap: var(--space-sm);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-full);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    font-size: var(--font-size-xs);
    color: var(--accent);
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(8px);
}
.hero-badge .pulse {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse-dot 2.5s infinite;
}

.hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
}
.hero h1 .gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradient-shift 5s ease-in-out infinite;
}

.hero-roles {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    min-height: 2.2rem;
    font-weight: 500;
}
.hero-roles .typed-cursor { color: var(--primary); animation: blink 1s step-end infinite; }
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }

.hero-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-2xl);
    max-width: 480px;
}

.hero-btns {
    display: flex; gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}
.btn-primary, .btn-outline {
    display: inline-flex; align-items: center; gap: var(--space-sm);
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
}
.btn-primary {
    background: var(--gradient-hero);
    background-size: 180% 180%;
    color: #fff;
    box-shadow: 0 4px 16px rgba(14,165,233,0.3);
    border: none;
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(14,165,233,0.35);
    background-position: 100% 50%;
}
.btn-outline {
    background: var(--surface-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    backdrop-filter: blur(8px);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(14,165,233,0.08);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(14,165,233,0.12);
}
.btn-primary i, .btn-outline i { width: 16px; height: 16px; }

/* Hero Social */
.hero-social {
    display: flex; gap: var(--space-sm);
}
.hero-social a {
    width: 44px; height: 44px;
    border-radius: var(--radius-md);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(8px);
}
.hero-social a:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(14,165,233,0.15);
}

/* ── Hero Avatar ───────────────────────────── */
.hero-visual { display: flex; justify-content: center; align-items: center; }
.avatar-wrapper {
    position: relative;
    width: 400px; height: 400px;
}
.avatar-ring {
    position: absolute; inset: 0;
    border-radius: 50%;
    border: 2px solid transparent;
    background: conic-gradient(from 0deg, var(--primary), var(--accent), var(--primary-light), var(--primary)) border-box;
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: rotate-ring 8s linear infinite;
}
@keyframes rotate-ring { to { transform: rotate(360deg); } }
.avatar-inner {
    position: absolute; inset: 16px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: inset 0 0 30px rgba(14,165,233,0.1);
}
.avatar-inner img {
    width: 100%; height: 100%;
    object-fit: cover; object-position: center 30%;
}

/* Floating badges */
.avatar-float {
    position: absolute;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    background: var(--surface-glass-strong);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-default);
    font-size: var(--font-size-xs);
    font-weight: 600;
    white-space: nowrap;
    box-shadow: var(--shadow-lg);
    animation: float-badge 4s ease-in-out infinite;
    transition: transform 0.3s ease;
}
.avatar-float:nth-child(3) { top: 8%; right: -8%; animation-delay: 0s; }
.avatar-float:nth-child(4) { bottom: 22%; left: -12%; animation-delay: 1.5s; }
.avatar-float:nth-child(5) { bottom: 2%; right: 2%; animation-delay: 3s; }
@keyframes float-badge {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

/* ── Stats ──────────────────────────────────── */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-3xl);
}
.stat-card {
    padding: var(--space-xl) var(--space-lg);
    border-radius: var(--radius-lg);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(8px);
}
.stat-card:hover {
    border-color: var(--border-default);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}
.stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-top: var(--space-xs);
    font-weight: 500;
}

/* ══════════════════════════════════════════════
   ABOUT
   ══════════════════════════════════════════════ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: start;
}
.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
}
.info-card {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s;
    backdrop-filter: blur(8px);
}
.info-card:hover { border-color: var(--border-default); }
.info-card .label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
}
.info-card .value {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-top: var(--space-xs);
}
.info-card .value a { color: var(--primary); text-decoration: none; }
.info-card .value a:hover { text-decoration: underline; }

/* ══════════════════════════════════════════════
   SKILLS
   ══════════════════════════════════════════════ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}
.skill-category {
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(8px);
}
.skill-category:hover {
    border-color: var(--border-default);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.skill-category-icon {
    width: 48px; height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-brand);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: var(--space-md);
}
.skill-category h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}
.skill-item {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: var(--space-sm);
}
.skill-item span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}
.skill-bar {
    width: 55%;
    height: 5px;
    border-radius: 3px;
    background: var(--border-subtle);
    overflow: hidden;
}
.skill-bar-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--gradient-brand);
    width: 0;
    transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ══════════════════════════════════════════════
   PROJECTS
   ══════════════════════════════════════════════ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: var(--space-xl);
}
.project-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--surface-elevated);
    border: 1px solid var(--border-subtle);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
}
.project-card:hover {
    border-color: var(--border-default);
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}
.project-thumb {
    height: 220px;
    position: relative;
    overflow: hidden;
    display: flex; align-items: center; justify-content: center;
}
.project-preview-img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.project-card:hover .project-preview-img { transform: scale(1.05); }
.project-thumb-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to bottom, transparent 40%, var(--bg));
}
.project-type-badge {
    position: absolute; top: var(--space-md); right: var(--space-md); z-index: 2;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-full);
    background: var(--surface-glass-strong);
    backdrop-filter: blur(12px);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--primary);
    border: 1px solid var(--border-subtle);
}
.project-thumb.thumb-1 { background: var(--thumb-1); }
.project-thumb.thumb-2 { background: var(--thumb-2); }
.project-thumb.thumb-3 { background: var(--thumb-3); }
.project-thumb.thumb-4 { background: var(--thumb-4); }
.project-thumb.thumb-5 { background: var(--thumb-5); }
.project-thumb.thumb-6 { background: var(--thumb-6); }

.project-body { padding: var(--space-xl); }
.project-body h3 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}
.project-body p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: var(--line-height-relaxed);
}
.project-tags {
    display: flex; flex-wrap: wrap; gap: var(--space-xs);
    margin-bottom: var(--space-md);
}
.project-tags span {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    background: rgba(14,165,233,0.08);
    color: var(--primary);
    font-size: var(--font-size-xs);
    font-weight: 600;
}
.project-links { display: flex; gap: var(--space-sm); }
.project-links a {
    display: inline-flex; align-items: center; gap: 0.25rem;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}
.project-link-primary { background: var(--gradient-brand); color: #fff; }
.project-link-primary:hover { box-shadow: 0 4px 14px rgba(14,165,233,0.35); }
.project-link-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}
.project-link-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ══════════════════════════════════════════════
   EXPERIENCE (Timeline)
   ══════════════════════════════════════════════ */
.timeline {
    position: relative;
    padding-left: 48px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 15px; top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent), transparent);
}
.timeline-item {
    position: relative;
    margin-bottom: var(--space-2xl);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(8px);
}
.timeline-item:hover {
    border-color: var(--border-default);
    box-shadow: var(--shadow-lg);
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -40px; top: 2rem;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 3px var(--primary);
}
.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    background: rgba(14,165,233,0.1);
    color: var(--primary);
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}
.timeline-item h3 { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: 0.2rem; }
.timeline-item h4 { font-size: var(--font-size-sm); color: var(--accent); margin-bottom: var(--space-md); font-weight: 500; }
.timeline-item ul { list-style: none; }
.timeline-item ul li {
    position: relative;
    padding-left: var(--space-lg);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    line-height: var(--line-height-relaxed);
}
.timeline-item ul li::before {
    content: '→';
    position: absolute; left: 0;
    color: var(--primary);
    font-weight: 600;
}
.timeline-sub {
    font-weight: 600;
    color: var(--text-primary) !important;
    margin-top: var(--space-lg);
    font-size: var(--font-size-sm) !important;
}

/* ══════════════════════════════════════════════
   EDUCATION
   ══════════════════════════════════════════════ */
.edu-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}
.edu-card {
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative; overflow: hidden;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(8px);
}
.edu-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-brand);
}
.edu-card:hover {
    border-color: var(--border-default);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.edu-card h3 { font-size: var(--font-size-lg); font-weight: 700; margin-bottom: 0.25rem; }
.edu-card h4 { font-size: var(--font-size-sm); color: var(--accent); margin-bottom: var(--space-sm); }
.edu-card p { font-size: var(--font-size-sm); color: var(--text-secondary); }

/* ── Certifications ─────────────────────────── */
.cert-list { display: grid; gap: var(--space-lg); }
.cert-card {
    display: flex; gap: var(--space-xl); align-items: start;
    padding: var(--space-xl) var(--space-2xl);
    border-radius: var(--radius-lg);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(8px);
}
.cert-card:hover { border-color: var(--border-default); box-shadow: var(--shadow-lg); }
.cert-icon {
    width: 52px; height: 52px; min-width: 52px;
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    background: rgba(14,165,233,0.1);
}
.cert-card h3 { font-size: var(--font-size-base); font-weight: 600; margin-bottom: 0.3rem; }
.cert-card p { font-size: var(--font-size-sm); color: var(--text-secondary); }
.cert-pursuing {
    display: inline-block;
    padding: 0.2rem 0.7rem;
    border-radius: var(--radius-full);
    background: rgba(255,107,107,0.12);
    color: #FF6B6B;
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-top: var(--space-sm);
}

/* ══════════════════════════════════════════════
   ACHIEVEMENTS
   ══════════════════════════════════════════════ */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}
.achievement-card {
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    text-align: center;
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(8px);
}
.achievement-card:hover {
    border-color: var(--border-default);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.achievement-icon {
    width: 56px; height: 56px;
    border-radius: var(--radius-md);
    background: var(--gradient-brand);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto var(--space-md);
}
.achievement-card h3 { font-size: var(--font-size-base); font-weight: 600; margin-bottom: var(--space-sm); }
.achievement-card p { font-size: var(--font-size-sm); color: var(--text-secondary); line-height: var(--line-height-relaxed); }
.achievement-stat {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-top: var(--space-md);
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

/* ══════════════════════════════════════════════
   CONTACT
   ══════════════════════════════════════════════ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}
.contact-info { display: flex; flex-direction: column; gap: var(--space-lg); }
.contact-item {
    display: flex; gap: var(--space-md); align-items: center;
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s;
    backdrop-filter: blur(8px);
}
.contact-item:hover {
    border-color: var(--border-default);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.contact-item-icon {
    width: 44px; height: 44px; min-width: 44px;
    border-radius: var(--radius-md);
    background: var(--gradient-brand);
    display: flex; align-items: center; justify-content: center;
}
.contact-item h4 {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
}
.contact-item p, .contact-item a {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
}
.contact-item a:hover { color: var(--primary); }

.contact-form {
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(8px);
}
.form-group { margin-bottom: var(--space-lg); }
.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}
.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    background: var(--surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    transition: all 0.3s;
    outline: none;
}
.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14,165,233,0.12);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }

.btn-submit {
    width: 100%;
    padding: 0.85rem;
    border-radius: var(--radius-md);
    background: var(--gradient-brand);
    color: #fff;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: var(--font-size-sm);
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 14px rgba(14,165,233,0.25);
}
.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(14,165,233,0.35);
}
.form-status {
    margin-top: var(--space-md);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    text-align: center;
    display: none;
}
.form-status.success { display: block; background: rgba(6,182,212,0.1); color: var(--accent); }
.form-status.error { display: block; background: rgba(255,107,107,0.1); color: #FF6B6B; }

/* ══════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════ */
.footer {
    position: relative; z-index: 1;
    padding: var(--space-3xl) 2rem;
    text-align: center;
    border-top: 1px solid var(--border-subtle);
    background: var(--surface-glass);
}
.footer p {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}
.footer-links {
    display: flex; justify-content: center; gap: var(--space-xl);
    margin-top: var(--space-md);
}
.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color 0.3s;
}
.footer-links a:hover { color: var(--primary); }

/* ══════════════════════════════════════════════
   BACK TO TOP
   ══════════════════════════════════════════════ */
.back-to-top {
    position: fixed; right: 1.5rem; bottom: 1.5rem;
    width: 44px; height: 44px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    background: var(--gradient-brand);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 1200;
    box-shadow: 0 8px 20px rgba(14,165,233,0.25);
    opacity: 0; visibility: hidden;
    transform: translateY(12px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(14,165,233,0.35);
}

/* ══════════════════════════════════════════════
   REVEAL ANIMATIONS
   ══════════════════════════════════════════════ */
.reveal {
    opacity: 0; transform: translateY(35px);
    filter: blur(5px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.active { opacity: 1; transform: translateY(0); filter: blur(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Shimmer hover effect on cards ──────────── */
.stat-card, .skill-category, .timeline-item, .edu-card,
.achievement-card, .project-card, .cert-card, .contact-item,
.contact-form, .info-card {
    position: relative; overflow: hidden;
}
.stat-card::after, .skill-category::after, .timeline-item::after,
.edu-card::after, .achievement-card::after, .project-card::after,
.cert-card::after, .contact-item::after, .contact-form::after,
.info-card::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(120deg, transparent 35%, rgba(255,255,255,0.25) 50%, transparent 65%);
    transform: translateX(-120%);
    opacity: 0;
    transition: transform 0.6s ease, opacity 0.4s ease;
    pointer-events: none;
}
.stat-card:hover::after, .skill-category:hover::after,
.timeline-item:hover::after, .edu-card:hover::after,
.achievement-card:hover::after, .project-card:hover::after,
.cert-card:hover::after, .contact-item:hover::after,
.contact-form:hover::after, .info-card:hover::after {
    transform: translateX(120%);
    opacity: 1;
}

/* ══════════════════════════════════════════════
   REDUCED MOTION
   ══════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ══════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════ */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.8rem;
        --font-size-4xl: 2.2rem;
    }
    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: var(--space-3xl); }
    .hero-content { padding-right: 0; }
    .hero-desc { margin: 0 auto var(--space-2xl); }
    .hero-btns, .hero-social { justify-content: center; }
    .hero-visual { order: -1; }
    .avatar-wrapper { width: 300px; height: 300px; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .edu-grid { grid-template-columns: 1fr; }
    .achievements-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.2rem;
        --font-size-4xl: 1.9rem;
        --space-4xl: 64px;
    }
    .nav-links, .nav-cta { display: none; }
    .hamburger { display: flex; }

    .section { padding: var(--space-3xl) 1rem; }
    .section-subtitle { font-size: var(--font-size-base); }
    .stats-bar { gap: var(--space-sm); }
    .achievements-grid { grid-template-columns: 1fr; }
    .about-info-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .cert-card { flex-direction: column; }
    .avatar-wrapper { width: 240px; height: 240px; }
    .avatar-float { font-size: 0.7rem; padding: 0.4rem 0.8rem; }
    .projects-grid { grid-template-columns: 1fr; }
    .back-to-top { right: 1rem; bottom: 1rem; }
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 1.8rem;
        --font-size-4xl: 1.6rem;
    }
    .avatar-wrapper { width: 200px; height: 200px; }
    .stats-bar { grid-template-columns: 1fr 1fr; gap: var(--space-sm); }
}