/**
 * ==============================================================================
 * SUKUMAR MUTHUSAMY - MASTER STYLESHEET (V2 - THE MASTER BUILD)
 * ==============================================================================
 */

/* --- 1. CSS VARIABLES (The Theme Engine) --- */
:root {
  --cyan: #00e5ff;
  --teal: #00bcd4;
  --green: #00ff9d;
  --pink: #f72585; 
  
  --bg-dark: #050d0f;
  --bg-mid: #0a141a;
  --card-bg: rgba(10, 20, 30, 0.6);
  
  --text-main: #cce8ec;
  --text-muted: #8aa8b0;
  
  --glass: rgba(0, 180, 200, 0.05);
  --glass-border: rgba(0, 229, 255, 0.15);
  
  --font-tech: 'Orbitron', sans-serif;
  --font-body: 'Syne', sans-serif;
  --font-code: 'Fira Code', monospace;
  
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* --- 2. RESET & BASE --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6; overflow-x: hidden; }

/* --- 3. CYBER BACKGROUND EFFECTS --- */
.bg-canvas { position: fixed; inset: 0; z-index: -3; background: radial-gradient(ellipse 80% 60% at 80% 20%, rgba(0,180,200,0.12) 0%, transparent 60%), radial-gradient(ellipse 60% 80% at 10% 80%, rgba(0,80,100,0.15) 0%, transparent 60%); }
.grid-overlay { position: fixed; inset: 0; z-index: -2; background-image: linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px); background-size: 50px 50px; mask-image: radial-gradient(ellipse 100% 100% at 50% 50%, black 20%, transparent 80%); -webkit-mask-image: radial-gradient(ellipse 100% 100% at 50% 50%, black 20%, transparent 80%); }
.scanline { position: fixed; inset: 0; z-index: -1; background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.1) 2px, rgba(0,0,0,0.1) 4px); pointer-events: none; }
.particles { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.particle { position: absolute; background: var(--cyan); border-radius: 50%; animation: float-up linear infinite; }
@keyframes float-up { 0% { transform: translateY(0) translateX(0); opacity: 0; } 10% { opacity: 1; } 90% { opacity: 1; } 100% { transform: translateY(-100vh) translateX(20px); opacity: 0; } }

/* --- 4. NAVBAR (< SM /> Logo) --- */
nav { position: fixed; top: 0; left: 0; right: 0; height: 70px; display: flex; align-items: center; justify-content: space-between; padding: 0 5%; background: rgba(5, 13, 15, 0.8); backdrop-filter: blur(12px); border-bottom: 1px solid var(--glass-border); z-index: 100; }
.nav-logo { font-family: var(--font-code); font-weight: 700; font-size: 1.3rem; color: var(--cyan); display: flex; align-items: center; gap: 10px; letter-spacing: 0.05em; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--green); } 50% { opacity: 0.4; box-shadow: 0 0 2px var(--green); } }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a { text-decoration: none; color: var(--text-muted); font-family: var(--font-tech); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; transition: var(--transition); }
.nav-links a:hover { color: var(--cyan); text-shadow: 0 0 8px rgba(0, 229, 255, 0.5); }

/* --- 5. GLOBAL SECTION STYLES --- */
section { position: relative; z-index: 10; padding: 100px 5%; max-width: 1400px; margin: 0 auto; }
.section-title { font-family: var(--font-tech); font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: 3rem; letter-spacing: 0.05em; }
.section-title span { color: var(--cyan); }

/* --- 6. UNIFIED HOVER CARD (The Lift & Glow Effect) --- */
.hover-card { background: var(--card-bg); border: 1px solid var(--glass-border); border-radius: 12px; transition: var(--transition); cursor: pointer; position: relative; overflow: hidden; }
.hover-card:hover { transform: translateY(-4px); border-color: var(--cyan); background: rgba(0, 229, 255, 0.05); box-shadow: 0 10px 25px rgba(0, 229, 255, 0.1); }

/* --- 7. HERO SECTION (180px Static Photo + Rotating HUD) --- */
.hero-section { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding-top: 70px; }
.hero-inner { text-align: center; max-width: 800px; animation: fadeUp 1s ease both; }

/* The Sci-Fi HUD Effect Logic */
.avatar-ring {
  position: relative; width: 180px; height: 180px; margin: 0 auto 2rem; display: flex; align-items: center; justify-content: center;
}
.avatar-ring::before {
  content: ''; position: absolute; inset: -4px; border-radius: 50%;
  background: conic-gradient(var(--cyan), var(--teal), var(--bg-dark), var(--bg-dark), var(--cyan));
  animation: spin 5s linear infinite; z-index: 0;
}
.avatar-inner {
  position: relative; z-index: 1; width: 100%; height: 100%; border-radius: 50%; background: var(--bg-mid); overflow: hidden; border: 4px solid var(--bg-dark);
}
.avatar-inner img { width: 100%; height: 100%; object-fit: cover; }
@keyframes spin { 100% { transform: rotate(360deg); } }

.hero-name { font-family: var(--font-tech); font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 900; background: linear-gradient(90deg, #fff, var(--cyan)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 1rem; }
.hero-role { font-size: 1.2rem; font-family: var(--font-code); color: var(--green); margin-bottom: 2rem; min-height: 1.5em; }
.blink-cursor { display: inline-block; width: 8px; height: 1em; background: var(--green); margin-left: 4px; vertical-align: middle; animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero-bio { font-size: 1.05rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 2.5rem; }

/* Socials & Pill Button */
.social-links { display: flex; justify-content: center; gap: 1rem; align-items: center; flex-wrap: wrap; }
.social-btn { border: 1px solid var(--glass-border); background: var(--glass); display: flex; align-items: center; justify-content: center; color: var(--cyan); transition: var(--transition); text-decoration: none; }
.icon-btn { width: 45px; height: 45px; border-radius: 50%; }
.pill-btn { height: 45px; padding: 0 1.5rem; border-radius: 50px; gap: 0.6rem; }
.pill-text { font-family: var(--font-code); font-size: 0.9rem; font-weight: 500; }
.social-btn:hover { background: rgba(0, 229, 255, 0.1); box-shadow: 0 0 15px rgba(0, 229, 255, 0.4); transform: translateY(-3px); border-color: var(--cyan); }
.icon { width: 20px; height: 20px; fill: currentColor; }

/* --- 8. SPLIT SECTION (Exp & Skills) --- */
.split-section { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }

/* Timeline (Hook + Panel Logic) */
.timeline { position: relative; padding-left: 1.5rem; border-left: 2px solid var(--glass-border); }
.tl-item { margin-bottom: 2rem; padding: 1.5rem; margin-left: 1.5rem; }
.tl-dot { position: absolute; left: -24px; top: 1.5rem; width: 14px; height: 14px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px rgba(0, 255, 157, 0.5); z-index: 2; }
.tl-date { font-family: var(--font-code); font-size: 0.85rem; color: var(--cyan); margin-bottom: 0.3rem; }
.tl-role { font-size: 1.2rem; font-weight: 700; color: #fff; margin-bottom: 0.2rem; }
.tl-co { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 0.8rem; font-family: var(--font-tech); }
.tl-desc { font-size: 0.95rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 1rem; }
.tl-link { font-family: var(--font-tech); font-size: 0.8rem; color: var(--pink); font-weight: 700; display: inline-block; transition: var(--transition); }
.tl-item:hover .tl-link { transform: translateX(5px); }

/* Skills */
.skill-group { margin-bottom: 2rem; }
.skill-category-title { font-family: var(--font-tech); font-size: 0.9rem; color: var(--cyan); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1rem; border-bottom: 1px solid var(--glass-border); padding-bottom: 0.5rem; }
.skills-grid { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.skill-tag { background: var(--glass); border: 1px solid var(--glass-border); padding: 0.5rem 1rem; border-radius: 50px; font-family: var(--font-code); font-size: 0.85rem; color: var(--text-main); }

/* --- 9. PROJECTS --- */
.project-filters { display: flex; gap: 1rem; margin-bottom: 2rem; flex-wrap: wrap; }
.filter-btn { background: transparent; border: 1px solid var(--glass-border); color: var(--text-muted); padding: 0.5rem 1.2rem; border-radius: 50px; font-family: var(--font-tech); font-size: 0.8rem; cursor: pointer; transition: var(--transition); }
.filter-btn:hover, .filter-btn.active { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 0 15px rgba(0, 229, 255, 0.2); }
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; margin-bottom: 4rem; }

.project-card { min-height: 280px; display: flex; flex-direction: column; justify-content: flex-end; padding: 0; }
@media (min-width: 768px) { .project-card-large { grid-column: span 2; } }
.project-card::before { content: ''; position: absolute; inset: -50%; background: conic-gradient(from 180deg, transparent, rgba(0, 229, 255, 0.3), transparent); opacity: 0; transition: opacity 0.4s; z-index: 0; }
.project-card:hover::before { opacity: 1; animation: spinGlow 4s linear infinite; }
@keyframes spinGlow { 100% { transform: rotate(360deg); } }
.project-bg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0.15; z-index: 1; transition: var(--transition); }
.project-card:hover .project-bg { opacity: 0.3; transform: scale(1.05); }
.project-content { position: relative; z-index: 2; padding: 2rem; background: linear-gradient(to top, rgba(5,13,15,1) 30%, transparent); }
.project-tag { display: inline-block; font-family: var(--font-code); font-size: 0.75rem; color: var(--green); margin-bottom: 0.5rem; }
.project-title { font-size: 1.4rem; color: #fff; margin-bottom: 0.5rem; }
.project-desc { font-size: 0.9rem; color: var(--text-muted); }

/* Archive List */
.archive-header { font-family: var(--font-tech); font-size: 1.2rem; margin-bottom: 1rem; color: #fff; }
.archive-list { display: flex; flex-direction: column; gap: 0.5rem; }
.archive-item { display: flex; align-items: center; justify-content: space-between; padding: 1rem; background: var(--glass); border: 1px solid var(--glass-border); border-radius: 8px; transition: var(--transition); }
.archive-item:hover { background: rgba(0, 229, 255, 0.05); border-color: var(--cyan); transform: translateX(5px); }
.archive-cat { font-family: var(--font-code); font-size: 0.8rem; color: var(--green); width: 120px;}
.archive-title { flex: 1; font-weight: 600; color: var(--text-main); }
.archive-link { font-family: var(--font-tech); font-size: 0.8rem; color: var(--cyan); text-decoration: none; }

/* --- 10. CREDENTIALS (3x2 Grid Setup) --- */
.credentials-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }
.certs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.cert-card { padding: 1.2rem; }
.cert-title { font-size: 1rem; color: #fff; margin-bottom: 0.4rem; line-height: 1.3; }
.cert-issuer { font-family: var(--font-code); font-size: 0.75rem; color: var(--cyan); }

/* Vault Button */
.vault-btn { margin-top: 1.5rem; width: 100%; justify-content: center; font-family: var(--font-code); border-style: dashed; padding: 1rem; background: transparent; }
.vault-btn:hover { border-style: solid; background: rgba(0, 229, 255, 0.05); }

/* Badges & Awards */
.badges-grid { display: flex; flex-wrap: wrap; gap: 1rem; }
.badge-item { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.1); border-radius: 50px; text-decoration: none; color: var(--text-main); transition: var(--transition); }
.badge-item:hover { border-color: var(--cyan); background: rgba(0,229,255,0.1); transform: translateY(-2px); }
.badge-name { font-size: 0.85rem; font-weight: 600; }
.awards-grid { display: grid; gap: 1rem; }
.award-card { padding: 1.5rem; }
.award-icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.award-title { font-size: 1.1rem; color: #fff; margin-bottom: 0.2rem; }
.award-date { font-family: var(--font-code); font-size: 0.8rem; color: var(--pink); }

/* --- 11. VOLUNTEER (Beyond Code) --- */
.volunteer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.volunteer-card { position: relative; height: 250px; border-radius: 12px; overflow: hidden; border: 1px solid var(--glass-border); }
.vol-bg { position: absolute; inset: 0; background-size: cover; background-position: center; transition: var(--transition); }
.volunteer-card:hover .vol-bg { transform: scale(1.05); }
.vol-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.9), rgba(0,0,0,0.2)); display: flex; flex-direction: column; justify-content: flex-end; padding: 1.5rem; opacity: 0.8; transition: var(--transition); }
.volunteer-card:hover .vol-overlay { opacity: 1; }
.vol-title { color: #fff; font-size: 1.2rem; margin-bottom: 0.5rem; }
.vol-desc { color: var(--text-main); font-size: 0.9rem; }

/* --- 12. CONTACT TERMINAL --- */
.contact-section { margin-top: 4rem; }
.terminal-window { background: #0a0a0a; border: 1px solid #333; border-radius: 8px; overflow: hidden; font-family: var(--font-code); max-width: 800px; margin: 0 auto; box-shadow: 0 15px 35px rgba(0,0,0,0.5); }
.terminal-header { background: #1a1a1a; padding: 10px 15px; display: flex; align-items: center; border-bottom: 1px solid #333; }
.term-dots .dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; margin-right: 6px; }
.dot.red { background: #ff5f56; } .dot.yellow { background: #ffbd2e; } .dot.green { background: #27c93f; }
.terminal-title { color: #888; font-size: 0.8rem; margin-left: auto; margin-right: auto; }
.terminal-body { padding: 25px; font-size: 0.95rem; color: #fff; }
.cmd { color: #ccc; margin-bottom: 10px; }
.prompt { color: var(--green); margin-right: 10px; font-weight: 700; }
.output-text { color: var(--text-muted); margin-bottom: 25px; padding-left: 20px; }
.contact-info-box { border-left: 2px solid var(--cyan); padding-left: 20px; margin-bottom: 25px; background: rgba(0, 229, 255, 0.02); padding-top: 10px; padding-bottom: 10px; border-radius: 0 8px 8px 0; }
.contact-row { display: flex; align-items: center; margin-bottom: 10px; }
.key { color: var(--pink); width: 120px; display: inline-block; }
.value { color: var(--cyan); }
.copy-btn { background: none; border: none; cursor: pointer; margin-left: 15px; font-size: 1.1rem; transition: transform 0.2s; }
.copy-btn:hover { transform: scale(1.2); }

/* --- 13. SIDE PANEL MODAL --- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(5px); z-index: 999; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
.modal-backdrop.active { opacity: 1; pointer-events: auto; }
.side-panel { position: fixed; top: 0; right: 0; width: 100%; max-width: 550px; height: 100vh; background: rgba(10, 20, 30, 0.95); backdrop-filter: blur(20px); border-left: 1px solid var(--glass-border); z-index: 1000; transform: translateX(100%); transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1); overflow-y: auto; padding: 3rem; box-shadow: -10px 0 40px rgba(0,0,0,0.5); }
.side-panel.active { transform: translateX(0); }
.modal-close { position: absolute; top: 1.5rem; right: 1.5rem; background: none; border: none; color: var(--text-muted); font-size: 2rem; cursor: pointer; transition: var(--transition); }
.modal-close:hover { color: var(--pink); transform: rotate(90deg); }
#side-panel-content { margin-top: 2rem; }
.panel-eyebrow { font-family: var(--font-code); font-size: 0.85rem; color: var(--green); display: block; margin-bottom: 0.5rem; }
.panel-title { font-size: 2rem; color: #fff; margin-bottom: 1rem; line-height: 1.2; }
.panel-body { font-size: 1rem; color: var(--text-main); line-height: 1.8; margin-bottom: 2.5rem; }
.panel-body strong { color: var(--cyan); font-weight: 600; }
.panel-body li { margin-bottom: 0.8rem; }
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.8rem 1.5rem; border-radius: 50px; font-family: var(--font-tech); font-size: 0.85rem; text-decoration: none; transition: var(--transition); cursor: pointer; color: var(--text-main); border: 1px solid var(--text-main); }
.btn-filled { background: var(--cyan); color: #000; font-weight: 700; border: none; }
.btn-filled:hover { background: #fff; box-shadow: 0 0 20px rgba(0, 229, 255, 0.6); }
.btn-outline { border: 1px solid var(--text-main); color: var(--text-main); }
.btn-outline:hover { border-color: var(--pink); color: var(--pink); }

/* --- 14. RESPONSIVE DESIGN --- */
@media (max-width: 992px) {
  .split-section, .credentials-wrapper { grid-template-columns: 1fr; gap: 3rem; }
  .archive-item { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}
@media (max-width: 768px) {
  nav { padding: 0 1.5rem; }
  .nav-links { display: none; }
  .hero-name { font-size: 2.5rem; }
  .avatar-ring { width: 150px; height: 150px; }
  section { padding: 60px 1.5rem; }
  .side-panel { padding: 2rem; max-width: 100%; }
  .contact-row { flex-direction: column; align-items: flex-start; gap: 5px; }
}