/* ============================================
   CSS Design System — Shahin Alam Portfolio
   Premium Cybersecurity Aesthetic
   GSAP + Three.js + Dynamic Effects
   ============================================ */

:root {
    --bg-primary: #030014;
    --bg-secondary: #0a0a1a;
    --bg-tertiary: #0f0f2a;
    --bg-card: rgba(15, 15, 40, 0.5);
    --bg-glass: rgba(10, 10, 30, 0.6);
    --text-primary: #e8e8f0;
    --text-secondary: #9898b8;
    --text-muted: #5a5a78;
    --accent-cyan: #00f0ff;
    --accent-green: #39ff14;
    --accent-violet: #b400ff;
    --accent-blue: #4d7cff;
    --accent-red: #ff3860;
    --accent-orange: #ff9f43;
    --accent-gold: #ffd700;
    --accent-silver: #c0c0c0;
    --accent-bronze: #cd7f32;
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
    --gradient-green: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
    --gradient-gold: linear-gradient(135deg, var(--accent-gold), var(--accent-orange));
    --border-color: rgba(0, 240, 255, 0.08);
    --border-glow: rgba(0, 240, 255, 0.25);
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --section-padding: 120px 0;
    --container-max: 1200px;
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
    cursor: none;
}

body.loading { overflow: hidden; }

::selection { background: rgba(0, 240, 255, 0.3); color: #fff; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--gradient-primary); border-radius: 10px; }

a, button { cursor: none; }

/* ---------- Preloader ---------- */
.preloader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-primary); z-index: 10000;
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}
.preloader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.preloader-inner { text-align: center; width: 400px; max-width: 90vw; }
.preloader-glitch {
    font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700;
    color: var(--accent-cyan); position: relative; margin-bottom: 30px;
    animation: preloader-glitch 2s infinite;
}
@keyframes preloader-glitch {
    0%, 90%, 100% { text-shadow: none; opacity: 1; }
    91% { text-shadow: -2px 0 var(--accent-red), 2px 0 var(--accent-cyan); }
    93% { text-shadow: 2px 0 var(--accent-violet), -2px 0 var(--accent-green); opacity: 0.8; }
    95% { text-shadow: -1px 0 var(--accent-cyan), 1px 0 var(--accent-red); }
    97% { text-shadow: 2px 0 var(--accent-green), -2px 0 var(--accent-violet); opacity: 1; }
}
.preloader-bar { width: 100%; height: 3px; background: rgba(255,255,255,0.05); border-radius: 3px; margin-bottom: 16px; overflow: hidden; }
.preloader-progress { height: 100%; width: 0%; background: var(--gradient-primary); border-radius: 3px; transition: width 0.3s ease; box-shadow: 0 0 15px rgba(0,240,255,0.5); }
.preloader-text { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted); margin-bottom: 12px; }
.preloader-hex { font-family: var(--font-mono); font-size: 0.6rem; color: rgba(0,240,255,0.2); word-break: break-all; line-height: 1.5; max-height: 40px; overflow: hidden; }

/* ---------- Custom Cursor ---------- */
.cursor-dot {
    position: fixed; top: 0; left: 0; width: 6px; height: 6px;
    background: var(--accent-cyan); border-radius: 50%; pointer-events: none;
    z-index: 9999; transform: translate(-50%, -50%);
    transition: width 0.2s, height 0.2s, background 0.2s;
    box-shadow: 0 0 10px var(--accent-cyan);
}
.cursor-ring {
    position: fixed; top: 0; left: 0; width: 40px; height: 40px;
    border: 1.5px solid rgba(0,240,255,0.4); border-radius: 50%;
    pointer-events: none; z-index: 9998; transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s, border-color 0.3s;
}
.cursor-dot.hover { width: 12px; height: 12px; background: var(--accent-violet); box-shadow: 0 0 20px var(--accent-violet); }
.cursor-ring.hover { width: 60px; height: 60px; border-color: rgba(180,0,255,0.4); }
.cursor-dot.click { transform: translate(-50%, -50%) scale(0.5); }

/* ---------- Background Layers ---------- */
#matrix-canvas { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; opacity: 0.06; }
#three-container { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }
#particle-canvas { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }

/* ---------- Container & Section ---------- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--section-padding); position: relative; z-index: 1; }
.section-title { display: flex; align-items: center; gap: 16px; margin-bottom: 70px; opacity: 0; }
.title-number { font-family: var(--font-mono); font-size: 1rem; color: var(--accent-cyan); font-weight: 600; }
.title-text { font-family: var(--font-sans); font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 700; color: var(--text-primary); white-space: nowrap; }
.title-line { flex: 1; height: 1px; background: linear-gradient(90deg, var(--border-glow), transparent); max-width: 300px; }

/* ---------- Navigation ---------- */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 18px 0; transition: var(--transition); background: transparent;
}
.navbar.scrolled {
    background: rgba(3,0,20,0.85); backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px); border-bottom: 1px solid var(--border-color);
    padding: 12px 0; box-shadow: 0 4px 40px rgba(0,0,0,0.4);
}
.nav-container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-family: var(--font-mono); font-size: 1.3rem; font-weight: 700; text-decoration: none; color: var(--text-primary); transition: var(--transition); display: inline-block; }
.logo-bracket { color: var(--accent-cyan); }
.logo-text { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-menu { display: flex; list-style: none; gap: 6px; }
.nav-link {
    font-family: var(--font-mono); font-size: 0.8rem; font-weight: 500;
    color: var(--text-secondary); text-decoration: none; padding: 8px 16px;
    border-radius: 8px; transition: var(--transition); position: relative; overflow: hidden;
}
.nav-link::before {
    content: ''; position: absolute; bottom: 0; left: 50%; width: 0; height: 2px;
    background: var(--gradient-primary); transition: var(--transition); transform: translateX(-50%);
}
.nav-link:hover::before, .nav-link.active::before { width: 70%; }
.nav-link:hover, .nav-link.active { color: var(--accent-cyan); }

.hamburger { display: none; flex-direction: column; cursor: pointer; background: none; border: none; gap: 6px; padding: 8px; z-index: 1001; }
.bar { width: 28px; height: 2px; background: var(--accent-cyan); border-radius: 3px; transition: var(--transition); transform-origin: center; }
.hamburger.active .bar:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.hamburger.active .bar:nth-child(2) { opacity: 0; }
.hamburger.active .bar:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

/* ---------- Hero ---------- */
.hero { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 120px 24px 60px; position: relative; z-index: 1; text-align: center; }
.hero-content { max-width: 950px; width: 100%; opacity: 0; }

.hero-badge {
    display: inline-flex; align-items: center; gap: 10px; padding: 8px 20px;
    background: rgba(0,240,255,0.05); border: 1px solid rgba(0,240,255,0.15);
    border-radius: 50px; margin-bottom: 30px; font-family: var(--font-mono); font-size: 0.8rem;
}
.badge-pulse { width: 8px; height: 8px; background: var(--accent-green); border-radius: 50%; animation: pulse 2s infinite; box-shadow: 0 0 10px var(--accent-green); }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(1.5); } }
.badge-text { color: var(--text-secondary); }
.badge-text i { color: var(--accent-cyan); margin-right: 6px; }

.hero-terminal {
    background: var(--bg-glass); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); overflow: hidden; text-align: left;
    margin-bottom: 40px; backdrop-filter: blur(15px);
    box-shadow: 0 0 80px rgba(0,240,255,0.03), 0 25px 60px rgba(0,0,0,0.4), inset 0 0 60px rgba(0,0,0,0.3);
    transform: perspective(1000px) rotateX(0deg); transition: transform 0.5s ease, box-shadow 0.5s ease;
}
.hero-terminal:hover {
    transform: perspective(1000px) rotateX(1deg);
    box-shadow: 0 0 100px rgba(0,240,255,0.06), 0 30px 80px rgba(0,0,0,0.5), inset 0 0 60px rgba(0,0,0,0.3);
}

.terminal-header { background: rgba(20,20,45,0.9); padding: 14px 20px; display: flex; align-items: center; border-bottom: 1px solid var(--border-color); }
.terminal-dots { display: flex; gap: 8px; }
.terminal-dot { width: 12px; height: 12px; border-radius: 50%; transition: var(--transition); }
.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #28c840; }
.terminal-title { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); margin-left: 16px; flex: 1; }
.terminal-actions { display: flex; gap: 12px; color: var(--text-muted); font-size: 0.7rem; }
.terminal-body { padding: 32px; }
.terminal-line { font-family: var(--font-mono); font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 8px; }
.terminal-prompt { color: var(--accent-green); margin-right: 8px; }
.terminal-command { color: var(--accent-cyan); }

.hero-name { font-family: var(--font-sans); font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 800; margin: 8px 0 24px; line-height: 1.1; }
.char-reveal { display: inline-block; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; opacity: 0; transform: translateY(30px) rotateX(-40deg); }

.hero-subtitle { font-family: var(--font-mono); font-size: clamp(1rem, 2.5vw, 1.35rem); color: var(--accent-green); margin-bottom: 8px; min-height: 2em; }
.separator { color: var(--text-muted); margin: 0 4px; }
.hero-description { font-size: 0.95rem; color: var(--text-secondary); font-family: var(--font-mono); }

/* Buttons */
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 50px; }
.btn {
    display: inline-flex; align-items: center; gap: 10px; padding: 14px 28px;
    border-radius: 12px; font-family: var(--font-mono); font-size: 0.88rem;
    font-weight: 600; text-decoration: none; transition: var(--transition);
    cursor: none; border: none; position: relative; overflow: hidden;
}
.btn-text { position: relative; z-index: 2; display: inline-flex; align-items: center; gap: 10px; }
.btn-primary { background: var(--gradient-primary); color: var(--bg-primary); box-shadow: 0 4px 25px rgba(0,240,255,0.25); }
.btn-primary .btn-glow {
    position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: btn-shine 3s infinite; z-index: 1;
}
@keyframes btn-shine { 0% { left: -100%; } 50% { left: 100%; } 100% { left: 100%; } }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 40px rgba(0,240,255,0.4); }
.btn-outline { background: transparent; color: var(--accent-cyan); border: 1.5px solid rgba(0,240,255,0.4); }
.btn-outline:hover { background: rgba(0,240,255,0.08); transform: translateY(-3px); box-shadow: 0 4px 25px rgba(0,240,255,0.2); border-color: var(--accent-cyan); }
.btn-ghost { background: transparent; color: var(--text-secondary); border: 1.5px solid var(--border-color); }
.btn-ghost:hover { color: var(--accent-cyan); border-color: rgba(0,240,255,0.4); transform: translateY(-3px); }

/* Hero Stats */
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding-top: 30px; border-top: 1px solid var(--border-color); }
.stat-item { text-align: center; padding: 16px; border-radius: 12px; transition: var(--transition); }
.stat-item:hover { background: rgba(0,240,255,0.03); }
.stat-number { font-family: var(--font-mono); font-size: 2.8rem; font-weight: 800; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; display: block; line-height: 1.2; }
.stat-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.5px; font-weight: 500; }

/* Scroll Indicator */
.scroll-indicator { position: absolute; bottom: 35px; left: 50%; transform: translateX(-50%); text-align: center; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.scroll-line { width: 1px; height: 60px; background: linear-gradient(to bottom, var(--accent-cyan), transparent); animation: scroll-pulse 2s infinite; }
@keyframes scroll-pulse { 0%, 100% { opacity: 1; height: 60px; } 50% { opacity: 0.3; height: 40px; } }
.scroll-indicator p { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 3px; writing-mode: vertical-rl; margin-top: 4px; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 50px; align-items: start; }
.code-block { background: rgba(10,10,30,0.8); border: 1px solid var(--border-color); border-radius: var(--border-radius); overflow: hidden; margin-bottom: 30px; backdrop-filter: blur(10px); }
.code-header { background: rgba(20,20,45,0.9); padding: 12px 18px; display: flex; align-items: center; gap: 8px; border-bottom: 1px solid var(--border-color); }
.code-dots { display: flex; gap: 6px; }
.code-dot { width: 10px; height: 10px; border-radius: 50%; }
.code-dot.red { background: #ff5f57; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #28c840; }
.code-filename { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); margin-left: 10px; }
.code-body { padding: 20px; font-family: var(--font-mono); font-size: 0.82rem; }
.code-line { display: flex; align-items: center; gap: 0; line-height: 2.2; transition: background 0.2s; padding: 0 8px; margin: 0 -8px; border-radius: 4px; }
.code-line:hover { background: rgba(0,240,255,0.03); }
.line-num { color: var(--text-muted); min-width: 28px; user-select: none; font-size: 0.72rem; opacity: 0.5; margin-right: 12px; }
.code-keyword { color: var(--accent-violet); font-weight: 600; }
.code-class { color: var(--accent-cyan); font-weight: 600; }
.code-func { color: var(--accent-blue); }
.code-param { color: var(--accent-orange); }
.code-attr { color: var(--text-primary); }
.code-string { color: var(--accent-green); }
.about-description { font-size: 1rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.9; }
.about-description strong { color: var(--accent-cyan); font-weight: 600; }
.about-description em { color: var(--accent-green); font-style: normal; font-weight: 500; }

/* Info Cards */
.about-info-cards { display: flex; flex-direction: column; gap: 16px; }
.info-card {
    display: flex; align-items: center; gap: 16px; padding: 22px;
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); transition: var(--transition);
    backdrop-filter: blur(10px); position: relative; overflow: hidden; opacity: 0;
}
.info-card-border { position: absolute; top: 0; left: 0; width: 3px; height: 100%; background: var(--gradient-primary); opacity: 0; transition: opacity 0.4s; }
.info-card:hover .info-card-border { opacity: 1; }
.info-card:hover { border-color: var(--border-glow); box-shadow: 0 0 30px rgba(0,240,255,0.06); }
.info-card i { font-size: 1.4rem; color: var(--accent-cyan); min-width: 40px; text-align: center; }
.info-card h4 { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-primary); margin-bottom: 2px; }
.info-card p { font-size: 0.82rem; color: var(--text-secondary); }

/* ---------- Skills ---------- */
.skills { background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%); }
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px; }
.skill-card {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); padding: 30px; transition: var(--transition);
    backdrop-filter: blur(10px); position: relative; overflow: hidden; opacity: 0;
}
.skill-card-border { position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: var(--gradient-primary); transform: scaleX(0); transform-origin: left; transition: transform 0.6s cubic-bezier(0.4,0,0.2,1); }
.skill-card:hover .skill-card-border { transform: scaleX(1); }
.skill-card:hover { border-color: var(--border-glow); transform: translateY(-6px); box-shadow: 0 20px 50px rgba(0,240,255,0.08); }
.skill-card-header { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.skill-icon-wrap { width: 42px; height: 42px; border-radius: 10px; background: rgba(0,240,255,0.08); display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.skill-card:hover .skill-icon-wrap { background: rgba(0,240,255,0.15); box-shadow: 0 0 15px rgba(0,240,255,0.1); }
.skill-icon-wrap i { font-size: 1.1rem; color: var(--accent-cyan); }
.skill-card-header h3 { font-family: var(--font-mono); font-size: 0.95rem; color: var(--text-primary); }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.skill-tag { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent-cyan); background: rgba(0,240,255,0.06); border: 1px solid rgba(0,240,255,0.12); padding: 5px 12px; border-radius: 20px; transition: var(--transition); }
.skill-tag:hover { background: rgba(0,240,255,0.12); border-color: rgba(0,240,255,0.3); transform: scale(1.05); box-shadow: 0 0 10px rgba(0,240,255,0.1); }
.skill-bar-container { height: 6px; background: rgba(255,255,255,0.04); border-radius: 6px; overflow: visible; position: relative; }
.skill-bar { height: 100%; background: var(--gradient-primary); border-radius: 6px; width: 0; transition: width 1.8s cubic-bezier(0.4,0,0.2,1); box-shadow: 0 0 12px rgba(0,240,255,0.3); position: relative; }
.skill-percent { position: absolute; right: 0; top: -22px; font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent-cyan); opacity: 0; transition: opacity 0.5s 1.5s; }
.skill-bar[style*="width"] .skill-percent { opacity: 1; }

/* ---------- Projects ---------- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 24px; margin-bottom: 40px; }
.project-card {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); padding: 32px; transition: var(--transition-slow);
    backdrop-filter: blur(10px); position: relative; overflow: hidden; opacity: 0;
}
.project-card-border { position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background: var(--gradient-primary); transform: scaleX(0); transition: transform 0.6s; }
.project-card:hover .project-card-border { transform: scaleX(1); }
.project-card-glow { position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(0,240,255,0.03) 0%, transparent 60%); opacity: 0; transition: opacity 0.6s ease; pointer-events: none; }
.project-card:hover .project-card-glow { opacity: 1; }
.project-card:hover { border-color: var(--border-glow); transform: translateY(-8px); box-shadow: 0 25px 70px rgba(0,240,255,0.08); }
.project-card.featured { border-color: rgba(0,240,255,0.15); background: rgba(0,240,255,0.02); }
.project-card.featured::after { content: '\2605 Featured'; position: absolute; top: 18px; right: 18px; font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent-gold); background: rgba(255,215,0,0.08); border: 1px solid rgba(255,215,0,0.2); padding: 3px 12px; border-radius: 6px; }
.project-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 18px; }
.project-icon { width: 50px; height: 50px; display: flex; align-items: center; justify-content: center; background: rgba(0,240,255,0.08); border-radius: 14px; font-size: 1.3rem; color: var(--accent-cyan); transition: var(--transition); }
.project-card:hover .project-icon { background: rgba(0,240,255,0.15); box-shadow: 0 0 20px rgba(0,240,255,0.1); }
.project-links a { color: var(--text-muted); font-size: 1.3rem; transition: var(--transition); }
.project-links a:hover { color: var(--accent-cyan); }
.project-title { font-family: var(--font-mono); font-size: 1.15rem; color: var(--text-primary); margin-bottom: 6px; }
.project-subtitle { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent-cyan); margin-bottom: 14px; opacity: 0.8; }
.project-description { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 18px; line-height: 1.75; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.project-tags span { font-family: var(--font-mono); font-size: 0.68rem; color: var(--accent-green); background: rgba(57,255,20,0.06); border: 1px solid rgba(57,255,20,0.12); padding: 4px 10px; border-radius: 6px; transition: var(--transition); }
.project-tags span:hover { background: rgba(57,255,20,0.12); border-color: rgba(57,255,20,0.3); }
.project-date { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); }
.project-date i { margin-right: 6px; }
.projects-cta { text-align: center; opacity: 0; }

/* ---------- Timeline ---------- */
.experience { background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%); }
.timeline { position: relative; padding-left: 50px; max-width: 800px; margin: 0 auto; }
.timeline::before { content: ''; position: absolute; left: 20px; top: 0; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-violet), transparent); }
.timeline-item { position: relative; margin-bottom: 40px; opacity: 0; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-marker { position: absolute; left: -50px; top: 0; width: 42px; height: 42px; background: var(--bg-primary); border: 2px solid var(--accent-cyan); border-radius: 50%; display: flex; align-items: center; justify-content: center; z-index: 2; transition: var(--transition); }
.education .timeline-marker { background: var(--bg-primary); }
.timeline-marker i { color: var(--accent-cyan); font-size: 0.95rem; }
.timeline-item:hover .timeline-marker { background: var(--accent-cyan); box-shadow: 0 0 25px rgba(0,240,255,0.4); }
.timeline-item:hover .timeline-marker i { color: var(--bg-primary); }
.timeline-content { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 28px; transition: var(--transition); backdrop-filter: blur(10px); }
.timeline-content:hover { border-color: var(--border-glow); box-shadow: 0 8px 30px rgba(0,240,255,0.06); }
.timeline-header { margin-bottom: 10px; }
.timeline-header h3 { font-family: var(--font-mono); font-size: 1.05rem; color: var(--text-primary); margin-bottom: 6px; }
.timeline-company { font-size: 0.88rem; color: var(--accent-cyan); }
.timeline-company i { margin-right: 6px; }
.timeline-date { display: inline-block; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); margin-right: 16px; margin-bottom: 6px; }
.timeline-date i { margin-right: 5px; color: var(--accent-cyan); }
.timeline-location { display: inline-block; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); margin-bottom: 12px; }
.timeline-location i { margin-right: 5px; color: var(--accent-violet); }
.timeline-details { list-style: none; padding-top: 8px; }
.timeline-details li { position: relative; padding-left: 20px; font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 8px; line-height: 1.65; }
.timeline-details li::before { content: '\25B9'; position: absolute; left: 0; color: var(--accent-cyan); font-weight: 700; }
.timeline-grade { font-family: var(--font-mono); font-size: 0.88rem; color: var(--accent-gold); margin-top: 10px; }
.timeline-grade i { margin-right: 6px; }

/* ---------- Achievements ---------- */
.achievements { background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%); }
.achievements-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.achievement-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 32px; text-align: center; transition: var(--transition-slow); backdrop-filter: blur(10px); position: relative; overflow: hidden; opacity: 0; }
.achievement-card-border { position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-primary); opacity: 0; transition: opacity 0.4s; }
.gold-border { background: var(--gradient-gold) !important; }
.silver-border { background: linear-gradient(135deg, #c0c0c0, #e8e8e8) !important; }
.bronze-border { background: linear-gradient(135deg, #cd7f32, #e8a756) !important; }
.achievement-card:hover .achievement-card-border { opacity: 1; }
.achievement-card:hover { transform: translateY(-10px); }
.achievement-card.gold { border-color: rgba(255,215,0,0.2); background: rgba(255,215,0,0.02); }
.achievement-card.gold:hover { box-shadow: 0 25px 70px rgba(255,215,0,0.12); }
.achievement-card.silver:hover { box-shadow: 0 25px 70px rgba(192,192,192,0.08); }
.achievement-card.bronze:hover { box-shadow: 0 25px 70px rgba(205,127,50,0.08); }
.achievement-rank { font-family: var(--font-mono); font-size: 3.2rem; font-weight: 900; margin-bottom: 10px; line-height: 1; }
.achievement-card.gold .achievement-rank { color: var(--accent-gold); }
.achievement-card.silver .achievement-rank { color: var(--accent-silver); }
.achievement-card.bronze .achievement-rank { color: var(--accent-bronze); }
.achievement-card:not(.gold):not(.silver):not(.bronze) .achievement-rank { color: var(--accent-cyan); }
.rank-total { font-size: 1.1rem; color: var(--text-muted); font-weight: 400; }
.achievement-badge { font-size: 2.2rem; margin-bottom: 18px; }
.achievement-card.gold .achievement-badge i { color: var(--accent-gold); }
.achievement-card.silver .achievement-badge i { color: var(--accent-silver); }
.achievement-card.bronze .achievement-badge i { color: var(--accent-bronze); }
.achievement-card:not(.gold):not(.silver):not(.bronze) .achievement-badge i { color: var(--accent-cyan); }
.achievement-card h3 { font-family: var(--font-mono); font-size: 0.95rem; color: var(--text-primary); margin-bottom: 8px; }
.achievement-team { font-size: 0.82rem; color: var(--accent-cyan); margin-bottom: 12px; }
.achievement-details { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 14px; }
.achievement-link { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent-cyan); text-decoration: none; transition: var(--transition); padding: 6px 14px; border-radius: 6px; border: 1px solid rgba(0,240,255,0.2); }
.achievement-link:hover { color: var(--accent-green); border-color: var(--accent-green); background: rgba(57,255,20,0.05); }

/* ---------- Contact ---------- */
.contact-subtitle { text-align: center; font-size: 1.05rem; color: var(--text-secondary); margin-top: -40px; margin-bottom: 50px; max-width: 600px; margin-left: auto; margin-right: auto; opacity: 0; }
.contact-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 20px; margin: 0 auto; }
.contact-card {
    display: flex; flex-direction: column; align-items: center; text-align: center;
    gap: 12px; padding: 32px 20px; background: var(--bg-card);
    border: 1px solid var(--border-color); border-radius: var(--border-radius);
    text-decoration: none; transition: var(--transition-slow);
    backdrop-filter: blur(10px); position: relative; overflow: hidden; opacity: 0;
}
.contact-card-border { position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--gradient-primary); transform: scaleX(0); transition: transform 0.5s; }
.contact-card:hover .contact-card-border { transform: scaleX(1); }
.contact-card:hover { border-color: var(--accent-cyan); transform: translateY(-8px); box-shadow: 0 20px 50px rgba(0,240,255,0.1); }
.contact-icon { width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; background: rgba(0,240,255,0.06); border: 1px solid rgba(0,240,255,0.1); border-radius: 50%; transition: var(--transition); }
.contact-card:hover .contact-icon { background: var(--accent-cyan); border-color: var(--accent-cyan); box-shadow: 0 0 25px rgba(0,240,255,0.3); }
.contact-icon i { font-size: 1.3rem; color: var(--accent-cyan); transition: var(--transition); }
.contact-card:hover .contact-icon i { color: var(--bg-primary); }
.contact-card h4 { font-family: var(--font-mono); font-size: 0.88rem; color: var(--text-primary); }
.contact-card p { font-size: 0.82rem; color: var(--text-secondary); word-break: break-all; }

/* ---------- Footer ---------- */
.footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 50px 0; position: relative; z-index: 1; }
.footer-content { display: flex; flex-direction: column; align-items: center; gap: 24px; }
.footer-logo { font-family: var(--font-mono); font-size: 1.2rem; font-weight: 700; }
.footer-social { display: flex; gap: 24px; }
.footer-social a { color: var(--text-muted); font-size: 1.3rem; transition: var(--transition); display: inline-flex; padding: 8px; }
.footer-social a:hover { color: var(--accent-cyan); transform: translateY(-3px); text-shadow: 0 0 15px var(--accent-cyan); }
.footer-copyright { font-size: 0.82rem; color: var(--text-muted); }

/* Back to Top */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px;
    background: rgba(10,10,30,0.8); border: 1px solid rgba(0,240,255,0.3);
    border-radius: 12px; color: var(--accent-cyan); font-size: 1rem;
    cursor: none; z-index: 100; opacity: 0; visibility: hidden;
    transition: var(--transition); display: flex; align-items: center;
    justify-content: center; backdrop-filter: blur(10px);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--accent-cyan); color: var(--bg-primary); transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0,240,255,0.3); }

.magnetic-btn { transition: transform 0.3s ease; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .about-grid { grid-template-columns: 1fr; }
    .about-info-cards { display: grid; grid-template-columns: repeat(2, 1fr); }
    .achievements-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .contact-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
    :root { --section-padding: 80px 0; }
    body { cursor: auto; }
    a, button { cursor: auto; }
    .cursor-dot, .cursor-ring { display: none; }
    .nav-menu {
        position: fixed; top: 0; right: -100%; width: 75%; max-width: 320px;
        height: 100vh; background: rgba(3,0,20,0.98); backdrop-filter: blur(30px);
        flex-direction: column; align-items: center; justify-content: center;
        gap: 8px; transition: right 0.4s ease; border-left: 1px solid var(--border-color); z-index: 999;
    }
    .nav-menu.active { right: 0; }
    .nav-link { font-size: 1rem; padding: 14px 30px; }
    .hamburger { display: flex; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .projects-grid { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: 1fr; }
    .about-info-cards { grid-template-columns: 1fr; }
    .hero-name { font-size: clamp(1.8rem, 8vw, 2.8rem); }
    .terminal-body { padding: 20px; }
    .timeline { padding-left: 40px; }
    .timeline::before { left: 14px; }
    .timeline-marker { left: -40px; width: 32px; height: 32px; }
    .timeline-marker i { font-size: 0.78rem; }
    .achievements-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .section-title { flex-direction: column; align-items: flex-start; gap: 8px; }
    .title-line { display: none; }
}

@media (max-width: 480px) {
    .hero-cta { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
    .contact-grid { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .stat-number { font-size: 2rem; }
    .hero-badge { font-size: 0.7rem; }
    .terminal-actions { display: none; }
}

@media print {
    .preloader, .cursor-dot, .cursor-ring, #matrix-canvas,
    #three-container, #particle-canvas, .back-to-top,
    .scroll-indicator { display: none !important; }
    body { background: #fff; color: #000; }
}