/* ============================================================
   Brian Cousineau Portfolio — style.css
   Dark Glass Morphism Design System
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --bg-base:        #080b12;
  --bg-mid:         #0d1220;
  --bg-card:        rgba(255, 255, 255, 0.045);
  --bg-card-hover:  rgba(255, 255, 255, 0.08);
  --bg-nav:         rgba(8, 11, 18, 0.85);
  --border:         rgba(255, 255, 255, 0.10);
  --border-accent:  rgba(59, 130, 246, 0.35);

  --accent-blue:    #3b82f6;
  --accent-purple:  #8b5cf6;
  --accent-cyan:    #06b6d4;
  --gradient:       linear-gradient(135deg, #3b82f6, #8b5cf6);
  --gradient-soft:  linear-gradient(135deg, rgba(59,130,246,0.15), rgba(139,92,246,0.15));

  --text-primary:   #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;
  --text-accent:    #60a5fa;

  --blur:           blur(24px);
  --blur-light:     blur(12px);
  --radius-sm:      10px;
  --radius-md:      16px;
  --radius-lg:      24px;
  --radius-xl:      32px;

  --shadow-card:    0 4px 32px rgba(0, 0, 0, 0.4), 0 1px 0 rgba(255,255,255,0.05) inset;
  --shadow-glow:    0 0 40px rgba(59, 130, 246, 0.15);
  --shadow-hover:   0 8px 48px rgba(0, 0, 0, 0.5), 0 0 24px rgba(59,130,246,0.12);

  --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);

  --font-heading:   'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body:      'Inter', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(59,130,246,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(139,92,246,0.06) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-base) 0%, var(--bg-mid) 100%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ---------- Utility ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-label::after {
  content: '';
  flex: 1;
  max-width: 40px;
  height: 1px;
  background: var(--accent-blue);
  opacity: 0.5;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(59, 130, 246, 0.2);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 100px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5);
}

.btn-ghost {
  background: var(--bg-card);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-card-hover);
  border-color: rgba(59,130,246,0.4);
  transform: translateY(-2px);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.nav.scrolled {
  background: var(--bg-nav);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  box-shadow: 0 4px 32px rgba(0,0,0,0.3);
}

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

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-logo-badge {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 7px 16px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 450;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.07);
}

.nav-cta {
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 500;
  background: var(--gradient);
  color: #fff;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59,130,246,0.4);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: var(--transition);
  background: none;
  border: none;
}

.nav-hamburger:hover {
  background: rgba(255,255,255,0.07);
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  background: rgba(8, 11, 18, 0.97);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
  z-index: 999;
  transform: translateY(-10px);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav-drawer-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.nav-drawer-link {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 450;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.nav-drawer-link:last-child {
  border-bottom: none;
}

.nav-drawer-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  z-index: 1;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 120px 0 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(59,130,246,0.12);
  border: 1px solid rgba(59,130,246,0.25);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-accent);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  background: linear-gradient(135deg, #e2e8f0 0%, #94a3b8 50%, #e2e8f0 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 4s linear infinite;
  margin-bottom: 12px;
}

@keyframes shimmer {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 500;
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  min-height: 2.2rem;
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: bounce-scroll 2.5s ease-in-out infinite;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--accent-blue));
}

@keyframes bounce-scroll {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  margin-top: 48px;
}

.about-text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
  font-size: 1.02rem;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-highlight {
  color: var(--text-accent) !important;
  font-weight: 500;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stat-card {
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px 2px 0 0;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 450;
}

/* ---------- Experience Timeline ---------- */
.timeline {
  position: relative;
  margin-top: 56px;
  padding: 0 0 16px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border) 10%, var(--border) 90%, transparent);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 40px 1fr;
  gap: 0;
  margin-bottom: 40px;
  align-items: start;
}

.timeline-item:nth-child(odd) .timeline-card {
  grid-column: 1;
}

.timeline-item:nth-child(odd) .timeline-center {
  grid-column: 2;
}

.timeline-item:nth-child(odd) .timeline-empty {
  grid-column: 3;
}

.timeline-item:nth-child(even) .timeline-empty {
  grid-column: 1;
}

.timeline-item:nth-child(even) .timeline-center {
  grid-column: 2;
}

.timeline-item:nth-child(even) .timeline-card {
  grid-column: 3;
}

.timeline-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20px;
}

.timeline-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gradient);
  border: 3px solid var(--bg-base);
  box-shadow: 0 0 0 2px rgba(59,130,246,0.4), 0 0 16px rgba(59,130,246,0.3);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.timeline-empty {
  /* intentionally empty — grid spacer */
}

.timeline-card {
  padding: 24px 28px;
}

.timeline-date {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.timeline-company {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-role {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent-purple);
  margin-bottom: 12px;
}

.timeline-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 14px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  color: var(--text-accent);
  transition: var(--transition);
}

.tag:hover {
  background: rgba(59,130,246,0.18);
  border-color: rgba(59,130,246,0.4);
}

.tag-purple {
  background: rgba(139,92,246,0.1);
  border-color: rgba(139,92,246,0.2);
  color: #a78bfa;
}

.tag-cyan {
  background: rgba(6,182,212,0.1);
  border-color: rgba(6,182,212,0.2);
  color: #22d3ee;
}

/* ---------- Education ---------- */
.education-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
}

.edu-card {
  padding: 36px 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 28px;
  align-items: start;
}

.edu-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.edu-school {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.edu-degree {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--accent-blue);
  margin-bottom: 6px;
}

.edu-dates {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.edu-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 14px;
}

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.skill-card {
  padding: 28px;
}

.skill-card-icon {
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.skill-card-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

/* ---------- Languages & Awards ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}

.lang-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.lang-item:last-child {
  border-bottom: none;
}

.lang-name {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.lang-level {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  color: var(--text-accent);
}

.award-item {
  display: flex;
  gap: 16px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.award-item:last-child {
  border-bottom: none;
}

.award-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.award-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.award-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.card-section-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-section-icon {
  font-size: 1.2rem;
}

.card-body {
  padding: 28px 28px 24px;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 48px;
}

.contact-info {
  padding: 36px;
}

.contact-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.contact-tagline {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 28px;
  line-height: 1.6;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.contact-item:last-of-type {
  border-bottom: none;
}

.contact-item-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--gradient-soft);
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-item-text {
  font-size: 0.9rem;
}

.contact-item-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 2px;
}

.contact-item-value {
  color: var(--text-accent);
  font-weight: 500;
  transition: var(--transition);
}

.contact-item-value:hover {
  color: var(--accent-blue);
  text-decoration: underline;
}

.contact-form {
  padding: 36px;
}

.form-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}

.form-input {
  width: 100%;
  padding: 11px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: var(--transition);
  outline: none;
  resize: none;
}

.form-input:focus {
  border-color: rgba(59,130,246,0.5);
  background: rgba(59,130,246,0.04);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.08);
}

.form-input::placeholder {
  color: var(--text-muted);
}

textarea.form-input {
  min-height: 110px;
}

/* ---------- Footer ---------- */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 36px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-link {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition);
  cursor: pointer;
}

.footer-link:hover {
  color: var(--text-accent);
}

.back-to-top {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
  color: var(--text-secondary);
}

.back-to-top:hover {
  background: rgba(59,130,246,0.12);
  border-color: rgba(59,130,246,0.3);
  color: var(--text-accent);
  transform: translateY(-2px);
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(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; }

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border) 30%, var(--border) 70%, transparent);
  margin: 0;
  position: relative;
  z-index: 1;
}

/* ============================================================
   RESPONSIVE — TABLET (≤900px)
   ============================================================ */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
  }

  .timeline::before {
    left: 20px;
    transform: none;
  }

  .timeline-item {
    grid-template-columns: 40px 1fr;
    grid-template-rows: auto;
  }

  .timeline-item:nth-child(odd) .timeline-card,
  .timeline-item:nth-child(even) .timeline-card {
    grid-column: 2;
    grid-row: 1;
  }

  .timeline-item:nth-child(odd) .timeline-center,
  .timeline-item:nth-child(even) .timeline-center {
    grid-column: 1;
    grid-row: 1;
  }

  .timeline-item:nth-child(odd) .timeline-empty,
  .timeline-item:nth-child(even) .timeline-empty {
    display: none;
  }
}

/* ============================================================
   RESPONSIVE — MOBILE (≤768px)
   ============================================================ */
@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-drawer {
    display: block;
  }

  .hero-content {
    padding: 100px 0 60px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .edu-card {
    grid-template-columns: 1fr;
    padding: 28px;
    gap: 16px;
  }

  .edu-icon {
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .timeline-card {
    padding: 20px;
  }
}

/* ============================================================
   MOBILE CLASS OVERRIDES (added by JS)
   ============================================================ */
html.is-mobile .hero-content {
  text-align: left;
}

html.is-desktop .about-grid {
  grid-template-columns: 1.1fr 0.9fr;
}

/* ============================================================
   SELECTION & SCROLLBAR
   ============================================================ */
::selection {
  background: rgba(59,130,246,0.3);
  color: var(--text-primary);
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-base);
}

::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.12);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.22);
}