/* ============================================
   PORTFOLIO — Design System & Styles
   Yash Bhawar — AI/ML Engineer & Data Analyst
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors — Medium Dark Theme */
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --bg-card: rgba(22, 33, 62, 0.7);
  --bg-card-hover: rgba(15, 52, 96, 0.5);

  --accent: #e94560;
  --accent-glow: rgba(233, 69, 96, 0.3);
  --accent-secondary: #533483;
  --accent-tertiary: #7c5cbf;
  --gradient-accent: linear-gradient(135deg, #e94560, #533483);
  --gradient-accent-soft: linear-gradient(135deg, rgba(233, 69, 96, 0.15), rgba(83, 52, 131, 0.15));
  --gradient-hero: linear-gradient(135deg, #e94560, #533483, #0f3460);

  --text-primary: #eaeaea;
  --text-secondary: #a8a8b3;
  --text-muted: #6b6b80;

  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(233, 69, 96, 0.3);

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --section-padding: 100px 0;
  --container-width: 1200px;
  --card-radius: 16px;
  --radius-sm: 8px;
  --radius-pill: 50px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

/* Background dot pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
  z-index: 0;
}

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

ul { list-style: none; }

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

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

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  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; }

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 16px 0;
  z-index: 1000;
  transition: var(--transition-smooth);
  backdrop-filter: blur(0px);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(26, 26, 46, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition-smooth);
}

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

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

.nav-resume-btn {
  padding: 8px 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-pill);
  color: var(--accent) !important;
  font-weight: 600 !important;
  transition: var(--transition-smooth) !important;
}

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

.nav-resume-btn:hover {
  background: var(--accent) !important;
  color: var(--bg-primary) !important;
  box-shadow: 0 0 20px var(--accent-glow);
}

/* Resume Dropdown */
.nav-resume-dropdown {
  position: relative;
}

.resume-dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 200px;
  background: rgba(22, 33, 62, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition-smooth);
  z-index: 1002;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.nav-resume-dropdown:hover .resume-dropdown-menu,
.nav-resume-dropdown.open .resume-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.resume-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.88rem !important;
  font-weight: 500 !important;
  color: var(--text-secondary) !important;
  transition: var(--transition-fast) !important;
  white-space: nowrap;
}

.resume-option::after { display: none !important; }

.resume-option:hover {
  background: rgba(233, 69, 96, 0.1) !important;
  color: var(--accent) !important;
}

.resume-icon {
  font-size: 1.1rem;
  line-height: 1;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  width: 28px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-smooth);
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* Ambient glow orbs */
.hero::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.12), transparent 70%);
  top: -100px;
  right: -100px;
  animation: float-orb 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(83, 52, 131, 0.12), transparent 70%);
  bottom: -50px;
  left: -50px;
  animation: float-orb 10s ease-in-out infinite reverse;
}

@keyframes float-orb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
  text-align: center;
  z-index: 1;
}

.hero-greeting {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 2px;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 20px;
  background: var(--gradient-hero);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease 0.15s forwards, gradient-shift 4s ease infinite;
  opacity: 0;
}

@keyframes gradient-shift {
  0% { background-position: 0% center; }
  50% { background-position: 100% center; }
  100% { background-position: 0% center; }
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 400;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.3s forwards;
}

.hero-typed {
  font-family: var(--font-heading);
  color: var(--accent);
  font-weight: 600;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 550px;
  margin: 0 auto 36px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.45s forwards;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.6s forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Buttons */
.btn {
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(233, 69, 96, 0.45);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(233, 69, 96, 0.15);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.8rem;
  animation: bounce-down 2s ease infinite;
}

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

@keyframes bounce-down {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ============================================
   ABOUT
   ============================================ */
.about {
  padding: var(--section-padding);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
}

.about-image-card {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1;
  border-radius: var(--card-radius);
  background: var(--gradient-accent-soft);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.about-image-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--card-radius);
  background: var(--gradient-accent);
  z-index: -1;
  opacity: 0.4;
}

.about-avatar-placeholder {
  font-size: 6rem;
  opacity: 0.6;
}

.about-text h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1rem;
}

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

/* Tech stack badges */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.tech-badge {
  padding: 6px 16px;
  background: rgba(233, 69, 96, 0.08);
  border: 1px solid rgba(233, 69, 96, 0.15);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  transition: var(--transition-smooth);
}

.tech-badge:hover {
  background: rgba(233, 69, 96, 0.15);
  border-color: rgba(233, 69, 96, 0.35);
  transform: translateY(-2px);
}

.tech-badge.purple {
  background: rgba(83, 52, 131, 0.12);
  border-color: rgba(124, 92, 191, 0.2);
  color: var(--accent-tertiary);
}

.tech-badge.purple:hover {
  background: rgba(83, 52, 131, 0.22);
  border-color: rgba(124, 92, 191, 0.4);
}

/* ============================================
   PROJECT SECTIONS
   ============================================ */
.projects-section {
  padding: var(--section-padding);
  position: relative;
}

.projects-section:nth-child(even) {
  background: rgba(22, 33, 62, 0.3);
}

/* Section divider accent */
.projects-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 3px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 28px;
}

#ai-llm .projects-grid {
  grid-template-columns: repeat(auto-fit, minmax(300px, 380px));
  justify-content: center;
}

/* ---------- Project Card ---------- */
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  overflow: hidden;
  transition: var(--transition-smooth);
  position: relative;
  backdrop-filter: blur(10px);
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--card-radius);
  padding: 1px;
  background: var(--gradient-accent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: var(--transition-smooth);
  pointer-events: none;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: transparent;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px var(--accent-glow);
}

.project-card:hover::before {
  opacity: 0.6;
}

.project-card-thumbnail {
  width: 100%;
  height: 200px;
  background: var(--gradient-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.project-card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
  filter: grayscale(15%) contrast(110%);
  mix-blend-mode: luminosity;
  transition: var(--transition-smooth);
}

.project-card:hover .project-card-thumbnail img {
  opacity: 1;
  filter: grayscale(0%) contrast(100%);
  mix-blend-mode: normal;
  transform: scale(1.05);
}

.project-card-thumbnail .placeholder-icon {
  font-size: 3.5rem;
  opacity: 0.5;
}

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

.project-card-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.project-card-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag {
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-pill);
  background: rgba(233, 69, 96, 0.1);
  color: var(--accent);
  border: 1px solid rgba(233, 69, 96, 0.15);
}

.tag.ml {
  background: rgba(83, 52, 131, 0.12);
  color: var(--accent-tertiary);
  border-color: rgba(124, 92, 191, 0.2);
}

.tag.data {
  background: rgba(15, 52, 96, 0.4);
  color: #64b5f6;
  border-color: rgba(100, 181, 246, 0.2);
}

.project-card-actions {
  display: flex;
  gap: 12px;
}

.card-btn {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.card-btn-primary {
  background: var(--gradient-accent);
  color: #fff;
}

.card-btn-primary:hover {
  box-shadow: 0 4px 15px var(--accent-glow);
  transform: translateY(-2px);
}

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

.card-btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================
   CONTACT / FOOTER
   ============================================ */
.contact {
  padding: var(--section-padding);
}

.contact-wrapper {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.contact-cta {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.contact-text {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-link {
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(233, 69, 96, 0.15);
}

.footer {
  padding: 30px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-heart {
  color: var(--accent);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 968px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .about-image-card {
    margin: 0 auto;
    max-width: 280px;
  }

  .tech-stack {
    justify-content: center;
  }

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

@media (max-width: 768px) {
  :root {
    --section-padding: 70px 0;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(26, 26, 46, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    transition: var(--transition-smooth);
    border-left: 1px solid var(--border);
  }

  .nav-links.open {
    right: 0;
  }

  .hamburger {
    display: flex;
  }

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

  .hero-name {
    font-size: clamp(2.2rem, 10vw, 3.5rem);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .resume-dropdown-menu {
    position: static;
    min-width: unset;
    transform: none;
    margin-top: 8px;
    box-shadow: none;
    border: 1px solid var(--border);
  }

  .nav-resume-dropdown:hover .resume-dropdown-menu {
    opacity: 0;
    visibility: hidden;
  }

  .nav-resume-dropdown.open .resume-dropdown-menu {
    opacity: 1;
    visibility: visible;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .project-card-thumbnail {
    height: 160px;
  }
}