/* ============================================
   DHIVYA PRABHAKARAN — Portfolio Styles
   Modern, clean, narrative-driven design
   ============================================ */

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

:root {
  --color-bg: #FAFAF9;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #555555;
  --color-text-muted: #888888;
  --color-accent: #2B5C8A;
  --color-accent-light: #3A7BC8;
  --color-accent-subtle: #E8F0F8;
  --color-border: #E5E5E5;
  --color-highlight: #F5E6D3;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --container-max: 1100px;
  --section-padding: 120px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Section Labels & Titles --- */
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 48px;
  color: var(--color-text);
}

em {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-accent);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--transition);
}

.nav.scrolled {
  background: rgba(250, 250, 249, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 12px 0;
  box-shadow: 0 1px 0 var(--color-border);
}

.nav-inner {
  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-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 0.9rem;
  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: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

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

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

.nav-cta {
  background: var(--color-text);
  color: var(--color-bg) !important;
  padding: 10px 24px;
  border-radius: 100px;
  font-weight: 500;
  transition: all var(--transition) !important;
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--color-accent) !important;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition);
  position: absolute;
  left: 0;
}

.nav-toggle span:first-child { top: 4px; }
.nav-toggle span:last-child { bottom: 4px; }

.nav-toggle.active span:first-child {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-toggle.active span:last-child {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.mobile-menu.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu a {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-text);
  transition: color var(--transition);
}

.mobile-menu a:hover {
  color: var(--color-accent);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 24px 60px;
  max-width: var(--container-max);
  margin: 0 auto;
  position: relative;
}

.hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
  color: var(--color-text);
}

.hero-name-sub {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  margin-top: -12px;
  line-height: 1.4;
}

.hero-name-sub em {
  font-style: italic;
  color: var(--color-text);
}

.hero-title em {
  font-style: italic;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(43, 92, 138, 0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

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

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

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 2px;
  animation: scrollDown 2s ease infinite;
}

@keyframes scrollDown {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* --- Animate In --- */
.animate-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease forwards;
}

/* Fallback for environments that don't support animations */
@media (prefers-reduced-motion: reduce) {
  .animate-in, .reveal {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
  }
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- About --- */
.about {
  padding: var(--section-padding) 0;
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 300px 1.4fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-photo {
  border-radius: 20px;
  overflow: hidden;
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
}

.about-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 24px;
}

.about-text p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  font-size: 1.02rem;
}

.about-text strong {
  color: var(--color-text);
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.highlight-card {
  background: var(--color-bg);
  padding: 28px 32px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.highlight-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(43, 92, 138, 0.08);
}

.highlight-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.highlight-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* --- Strengths --- */
.strengths {
  padding: var(--section-padding) 0;
}

.strengths-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.strength-card {
  background: var(--color-surface);
  padding: 36px 28px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.strength-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(43, 92, 138, 0.08);
}

.strength-icon {
  width: 52px;
  height: 52px;
  background: var(--color-accent-subtle);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--color-accent);
}

.strength-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.strength-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Tech Stack --- */
.tech-stack {
  padding: var(--section-padding) 0;
  background: var(--color-surface);
}

.stack-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.stack-category h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.stack-tag {
  display: inline-block;
  padding: 8px 18px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.stack-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

/* --- Projects --- */
.projects {
  padding: var(--section-padding) 0;
}

.project-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

.project-card.reverse {
  grid-template-columns: 1fr 1.2fr;
}

.project-card.reverse .project-image {
  order: 2;
}

.project-card.reverse .project-info {
  order: 1;
}

.project-image {
  display: block;
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, #E8F0F8 0%, #D5E0EC 50%, #C8D8E8 100%);
  text-decoration: none;
  cursor: pointer;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

/* Hide broken image icon and alt text */
.project-image img[src=""],
.project-image img:not([src]) {
  display: none;
}

.project-image img::after {
  content: '';
  display: block;
  position: absolute;
  inset: 0;
}

.project-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--color-accent);
  opacity: 0.5;
  pointer-events: none;
}

.project-placeholder svg {
  opacity: 0.4;
}

.project-placeholder span {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Dayli AI styled cover */
.dayli-cover {
  background: linear-gradient(135deg, #2D1B4E 0%, #4A2D7A 40%, #6B3FA0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.dayli-cover .dayli-logo {
  width: auto;
  height: 60px;
  object-fit: contain;
  position: relative;
  z-index: 1;
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(43, 92, 138, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.project-overlay span {
  color: white;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 10px 24px;
  border: 1.5px solid rgba(255,255,255,0.6);
  border-radius: 100px;
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.project-tags span {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  padding: 5px 12px;
  border-radius: 100px;
}

.project-info h3 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.project-info p {
  color: var(--color-text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.project-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.project-meta span:not(:last-child)::after {
  content: '|';
  margin-left: 16px;
  color: var(--color-border);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-accent);
  transition: gap var(--transition);
}

.project-link:hover {
  gap: 14px;
}

/* --- Experience Timeline --- */
.experience {
  padding: var(--section-padding) 0;
  background: var(--color-surface);
}

.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 7px;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

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

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

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--color-bg);
  border: 3px solid var(--color-accent);
  border-radius: 50%;
  z-index: 1;
}

.timeline-date {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.timeline-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-org {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 10px;
}

.timeline-content p:last-child {
  color: var(--color-text-secondary);
  font-size: 0.92rem;
}

/* --- Education --- */
.education {
  padding: var(--section-padding) 0;
}

.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.edu-card {
  background: var(--color-surface);
  padding: 32px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.edu-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(43, 92, 138, 0.08);
}

.edu-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.edu-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.edu-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.cert-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.cert-tag {
  display: inline-block;
  padding: 8px 18px;
  background: var(--color-accent-subtle);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-accent);
  transition: all var(--transition);
}

.cert-tag:hover {
  background: var(--color-accent);
  color: white;
}

/* --- Contact --- */
.contact {
  padding: var(--section-padding) 0;
  background: var(--color-text);
  color: var(--color-bg);
}

.contact .section-label {
  color: rgba(255,255,255,0.5);
}

.contact-heading {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 20px;
}

.contact-heading em {
  color: var(--color-accent-light);
  -webkit-text-fill-color: var(--color-accent-light);
}

.contact-text {
  color: rgba(255,255,255,0.7);
  font-size: 1.05rem;
  max-width: 540px;
  margin-bottom: 40px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
  transition: all var(--transition);
  width: fit-content;
}

.contact-link:hover {
  color: white;
  transform: translateX(6px);
}

.contact-link svg {
  opacity: 0.6;
}

/* --- Footer --- */
.footer {
  padding: 24px 0;
  background: var(--color-text);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 900px) {
  :root {
    --section-padding: 80px;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .mobile-menu {
    display: flex;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-highlights {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .highlight-card {
    flex: 1;
    min-width: 140px;
  }

  .strengths-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-card,
  .project-card.reverse {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .project-card.reverse .project-image,
  .project-card.reverse .project-info {
    order: unset;
  }

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

  .stack-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 600px) {
  :root {
    --section-padding: 60px;
  }

  .hero {
    padding: 100px 20px 40px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

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

  .about-highlights {
    flex-direction: column;
  }

  .project-info h3 {
    font-size: 1.4rem;
  }

  .contact-heading {
    font-size: 1.8rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}