/* --- MODERN CSS RESET & VARIABLES --- */
:root {
  /* Dark Theme (Default) */
  --bg-base: #09090b; /* Zinc 950 */
  --bg-surface: rgba(24, 24, 27, 0.65); /* Zinc 900 */
  --bg-surface-hover: rgba(39, 39, 42, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-main: #f4f4f5; /* Zinc 50 */
  --text-muted: #a1a1aa; /* Zinc 400 */
  --accent: #3b82f6; /* Blue 500 */
  --accent-hover: #60a5fa; /* Blue 400 */
  --accent-glow: rgba(59, 130, 246, 0.15);
  --success: #10b981; /* Emerald 500 */
  
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --container: 1200px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.8);
  --bg-surface-hover: rgba(255, 255, 255, 1);
  --border-color: rgba(15, 23, 42, 0.08);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.1);
}

* , *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", -apple-system, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.6;
  background-image: 
    radial-gradient(circle at 15% 50%, var(--accent-glow), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.05), transparent 25%);
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.2; margin-top: 0; }
.container { width: min(92%, var(--container)); margin: 0 auto; }

/* --- NAVIGATION --- */
.site-header {
  position: sticky; top: 0; z-index: 100; 
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  background: rgba(9, 9, 11, 0.7);
}
html[data-theme="light"] .site-header { background: rgba(248, 250, 252, 0.7); }

.nav-wrap {
  height: 72px; display: flex; align-items: center; justify-content: space-between;
}
.logo { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.02em; }
.logo span { color: var(--accent); }

.nav-menu { display: flex; gap: 8px; }
.nav-menu a, .theme-toggle {
  padding: 8px 16px; border-radius: 99px; font-size: 0.9rem; font-weight: 500;
  color: var(--text-muted); transition: var(--transition);
}
.nav-menu a:hover, .theme-toggle:hover {
  color: var(--text-main); background: var(--border-color);
}
.theme-toggle { border: 1px solid var(--border-color); background: transparent; cursor: pointer; }

/* --- BENTO CARD BASE --- */
.bento-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}
.bento-card:hover {
  transform: translateY(-4px);
  background: var(--bg-surface-hover);
  border-color: var(--accent-glow);
  box-shadow: 0 10px 40px -10px var(--accent-glow);
}

/* --- HERO BENTO GRID --- */
.hero { padding: 100px 0 60px; min-height: 85vh; display: flex; align-items: center; }
.hero-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  grid-template-rows: auto auto;
  gap: 20px;
}
.hero-main { grid-column: 1 / 2; grid-row: 1 / 3; display: flex; flex-direction: column; justify-content: center; }
.hero-status { grid-column: 2 / 3; grid-row: 1 / 2; }
.hero-contact { grid-column: 2 / 3; grid-row: 2 / 3; display: flex; flex-direction: column; justify-content: center;}

.status-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 99px;
  background: rgba(16, 185, 129, 0.1); border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--success); font-size: 0.85rem; font-weight: 600; margin-bottom: 24px;
}
.status-badge::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--success);
  box-shadow: 0 0 12px var(--success); animation: pulse 2s infinite;
}

.hero h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.04em; margin-bottom: 20px; }
.hero p { font-size: 1.1rem; color: var(--text-muted); max-width: 90%; margin-bottom: 32px; }

/* Buttons */
.btn-group { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  padding: 12px 24px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem;
  transition: var(--transition); cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
}
.btn-primary {
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 0 20px var(--accent-glow); }
.btn-secondary { background: transparent; color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--border-color); }

/* Hero Side Info */
.info-row { display: flex; justify-content: space-between; border-bottom: 1px solid var(--border-color); padding: 12px 0; font-size: 0.9rem;}
.info-row:last-child { border-bottom: none; }
.info-label { color: var(--text-muted); }
.info-value { font-weight: 600; text-align: right; }

/* --- SECTIONS --- */
.section { padding: 80px 0; }
.section-header { margin-bottom: 40px; }
.section-header h2 { font-size: 2.5rem; letter-spacing: -0.03em; margin-bottom: 12px; }
.section-header p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; }

/* --- SKILLS GRID (BENTO) --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.tag {
  padding: 6px 12px; border-radius: 6px; font-size: 0.85rem; font-weight: 500;
  background: var(--border-color); color: var(--text-main);
}
.bento-card:hover .tag { background: rgba(59, 130, 246, 0.1); color: var(--accent); }

/* ===== EXPERIENCE SECTION ===== */
#experience {
  padding: 80px 40px;
  max-width: 900px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  color: #00e5ff;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.section-subtitle {
  color: #aaa;
  margin-bottom: 40px;
  font-size: 0.95rem;
}

.exp-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.exp-card {
  background: #111827;
  border: 1px solid #1e293b;
  border-radius: 12px;
  padding: 22px 28px;
  cursor: pointer;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.exp-card:hover {
  border-color: #00e5ff;
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.15);
}

.exp-card.open {
  border-color: #00e5ff;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}

.exp-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.exp-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.exp-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.exp-left h3 {
  font-size: 1.1rem;
  color: #e2e8f0;
  margin: 0 0 4px 0;
}

.exp-meta {
  color: #94a3b8;
  font-size: 0.85rem;
  margin: 0;
}

.exp-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.exp-tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.exp-tag.current  { background: #00e5ff22; color: #00e5ff; border: 1px solid #00e5ff55; }
.exp-tag.past     { background: #a78bfa22; color: #a78bfa; border: 1px solid #a78bfa55; }
.exp-tag.coop     { background: #34d39922; color: #34d399; border: 1px solid #34d39955; }
.exp-tag.volunteer{ background: #fbbf2422; color: #fbbf24; border: 1px solid #fbbf2455; }

.exp-toggle-icon {
  font-size: 1.5rem;
  color: #00e5ff;
  font-weight: 300;
  transition: transform 0.3s;
  line-height: 1;
}

.exp-card.open .exp-toggle-icon {
  transform: rotate(45deg);
}

.exp-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding-top: 0;
}

.exp-card.open .exp-detail {
  max-height: 600px;
  padding-top: 20px;
}

.exp-detail ul {
  padding-left: 20px;
  margin: 0;
}

.exp-detail ul li {
  color: #94a3b8;
  font-size: 0.92rem;
  margin-bottom: 10px;
  line-height: 1.6;
}

.exp-detail ul li::marker {
  color: #00e5ff;
}

/* --- PROJECTS --- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.project-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.project-icon { width: 40px; height: 40px; border-radius: 10px; background: rgba(59, 130, 246, 0.1); display: flex; align-items: center; justify-content: center; color: var(--accent); font-weight: bold; font-size: 1.2rem;}

/* --- CONTACT --- */
.contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 500; margin-bottom: 8px; color: var(--text-muted); }
.form-control {
  width: 100%; padding: 14px; border-radius: var(--radius-sm); border: 1px solid var(--border-color);
  background: rgba(0,0,0,0.2); color: var(--text-main); font-family: inherit; transition: var(--transition);
}
html[data-theme="light"] .form-control { background: #fff; }
.form-control:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

/* --- FORM RESULT BADGE --- */
.form-result-badge {
  display: none; /* Hidden by default */
  margin-top: 16px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-align: center;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: var(--transition);
}

/* Loading State */
.form-result-badge.loading {
  display: block;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border-color: var(--border-color);
}

/* Success State */
.form-result-badge.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border-color: rgba(16, 185, 129, 0.2);
}

/* Error State */
.form-result-badge.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.2);
}
footer { text-align: center; padding: 40px 0; border-top: 1px solid var(--border-color); color: var(--text-muted); font-size: 0.9rem; margin-top: 80px; }

/* --- UTILITIES & ANIMATIONS --- */
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}
.reveal { opacity: 0; transform: translateY(20px); transition: all 0.6s ease-out; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-main { grid-column: 1; grid-row: 1; }
  .hero-status { grid-column: 1; grid-row: 2; }
  .hero-contact { grid-column: 1; grid-row: 3; }
  .contact-wrapper { grid-template-columns: 1fr; }
  .nav-menu { display: none; }
}