/* ============================================
   SRINIVAS GANTI — Personal Site
   Modern, minimal, professional
   ============================================ */

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

:root {
  --color-bg: #0a0f1a;
  --color-surface: #0f1525;
  --color-surface-2: #141c2e;
  --color-border: #1e2a42;
  --color-border-subtle: #172036;
  --color-text: #f1f3f8;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-accent: #f0b847;
  --color-accent-dim: rgba(240, 184, 71, 0.12);
  --color-accent-blue: #60a5fa;
  --color-accent-purple: #a78bfa;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

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

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 16px 24px 24px;
  gap: 16px;
  border-top: 1px solid var(--color-border);
}

.nav-mobile a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.nav-mobile a:hover {
  color: var(--color-text);
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-mobile.open { display: flex; }
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(240, 184, 71, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 184, 71, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black, transparent);
}

.hero-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    rgba(240, 184, 71, 0.07) 0%,
    rgba(96, 165, 250, 0.03) 40%,
    transparent 70%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-photo {
  margin-bottom: 28px;
}

.hero-photo img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(240, 184, 71, 0.3);
  box-shadow: 0 0 40px rgba(240, 184, 71, 0.1), 0 8px 32px rgba(0, 0, 0, 0.3);
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 32px;
  border: 1px solid rgba(240, 184, 71, 0.15);
}

.hero-title {
  margin-bottom: 20px;
}

.hero-name {
  display: block;
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(135deg, #f1f3f8 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-family: var(--font-mono);
  color: var(--color-text);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 100px;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: #f5c95c;
  box-shadow: 0 0 30px rgba(240, 184, 71, 0.3);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
  transform: translateY(-1px);
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* --- Sections --- */
.section {
  padding: 120px 0;
}

.section-alt {
  background: var(--color-surface);
}

.section-dark {
  background: linear-gradient(180deg, var(--color-bg) 0%, #060a14 100%);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 100px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
  border: 1px solid rgba(240, 184, 71, 0.1);
}

.section-tag-light {
  background: rgba(255,255,255,0.06);
  color: var(--color-text-secondary);
  border-color: rgba(255,255,255,0.08);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--color-text);
}

.section-title-light {
  color: var(--color-text);
}

.section-subtitle {
  margin-top: 16px;
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-weight: 400;
}

/* --- About Cards --- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.about-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(240, 184, 71, 0.08);
}

.about-card-featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--color-surface) 0%, rgba(240, 184, 71, 0.04) 100%);
  border-color: rgba(240, 184, 71, 0.15);
}

.about-card-icon {
  color: var(--color-accent);
  margin-bottom: 20px;
}

.about-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.about-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-card-featured {
    grid-column: auto;
  }
}

/* --- Expertise --- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.expertise-category {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.expertise-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.dot-blue { background: var(--color-accent-blue); }
.dot-purple { background: var(--color-accent-purple); }

.expertise-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-subtle);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.expertise-list li:hover {
  color: var(--color-text);
}

.expertise-list li:last-child {
  border-bottom: none;
}

@media (max-width: 768px) {
  .expertise-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* --- Platform --- */
.platform-intro {
  text-align: center;
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: -32px auto 56px;
  line-height: 1.8;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.platform-card:hover {
  border-color: rgba(240, 184, 71, 0.3);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.platform-card-accent {
  background: linear-gradient(135deg, rgba(240, 184, 71, 0.06) 0%, var(--color-surface) 100%);
  border-color: rgba(240, 184, 71, 0.2);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.platform-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.platform-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  opacity: 0.7;
}

.platform-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.platform-list li {
  position: relative;
  padding: 6px 0 6px 20px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.platform-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
}

.platform-impact {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.platform-impact strong {
  color: var(--color-accent);
  font-weight: 600;
}

@media (max-width: 768px) {
  .platform-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Timeline --- */
.timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  z-index: 1;
}

.timeline-item:first-child .timeline-marker {
  background: var(--color-accent);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.timeline-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.timeline-content p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.timeline-list li {
  position: relative;
  padding: 4px 0 4px 20px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.timeline-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
}

.timeline-note {
  margin-top: 12px;
  font-style: italic;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* --- Leadership --- */
.leadership-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.leadership-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all var(--transition);
}

.leadership-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.leadership-card svg {
  color: var(--color-accent);
  margin: 0 auto 16px;
}

.leadership-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.leadership-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .leadership-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .leadership-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Blog CTA --- */
.blog-cta {
  text-align: center;
  padding: 56px 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(240, 184, 71, 0.06) 0%, rgba(96, 165, 250, 0.04) 100%);
  border: 1px solid rgba(240, 184, 71, 0.15);
}

.blog-cta-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 16px;
}

.blog-cta-text {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* --- Education --- */
.education-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 700px;
  margin: 0 auto;
}

.education-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}

.education-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.education-field {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

.education-school {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

@media (max-width: 600px) {
  .education-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Contact --- */
.contact-grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.contact-card:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(240, 184, 71, 0.08);
}

.contact-card svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .contact-grid {
    flex-direction: column;
    align-items: center;
  }
  .contact-card {
    width: 100%;
    max-width: 360px;
    justify-content: center;
  }
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.footer-inner {
  text-align: center;
}

.footer p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive polish --- */
@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }
  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }
  .hero-stats {
    gap: 20px;
  }
  .stat-divider {
    height: 30px;
  }
  .scroll-indicator {
    display: none;
  }
}