@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;900&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* --- Design Tokens & Themes --- */
:root {
  color-scheme: light dark;
  
  /* Fonts */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  /* Light Theme Variables */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  
  --accent-color: #6366f1;
  --accent-secondary: #a855f7;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --accent-glow: rgba(99, 102, 241, 0.15);
  
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(99, 102, 241, 0.08);
  --card-hover-border: rgba(99, 102, 241, 0.25);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.02);
  
  --nav-bg: rgba(255, 255, 255, 0.75);
  --nav-border: rgba(0, 0, 0, 0.05);
  
  --timeline-line: #e2e8f0;
  --timeline-dot: #6366f1;
  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --input-focus: #6366f1;

  --transition-speed: 0.3s;
  --border-radius-lg: 24px;
  --border-radius-md: 16px;
  --border-radius-sm: 8px;
}

[data-theme="dark"] {
  /* Dark Theme Variables */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  
  --accent-color: #818cf8;
  --accent-secondary: #c084fc;
  --accent-gradient: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
  --accent-glow: rgba(129, 140, 248, 0.25);
  
  --card-bg: rgba(17, 24, 39, 0.6);
  --card-border: rgba(255, 255, 255, 0.04);
  --card-hover-border: rgba(129, 140, 248, 0.3);
  --card-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  
  --nav-bg: rgba(11, 15, 25, 0.75);
  --nav-border: rgba(255, 255, 255, 0.05);
  
  --timeline-line: #1e293b;
  --timeline-dot: #818cf8;
  --input-bg: #1f2937;
  --input-border: #374151;
  --input-focus: #818cf8;
}

/* --- Base Resets & Layout --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar customization */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--input-border);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-color);
}

section {
  padding: 100px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 1rem + 3vw, 2.75rem);
  font-weight: 700;
  margin-bottom: 12px;
  text-align: center;
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--text-secondary);
  text-align: center;
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 60px;
}

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

/* --- Utility Components --- */
.accent-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 30px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background-color var(--transition-speed);
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 10px 20px -5px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 25px -5px var(--accent-glow);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: var(--card-hover-border);
}

.glass-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--border-radius-lg);
  padding: 32px;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s;
}
.glass-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-hover-border);
}

/* --- Header / Navigation --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: padding var(--transition-speed);
  padding: 20px 24px;
}
header.scrolled {
  padding: 12px 24px;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

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

.nav-links a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color 0.2s;
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.2s;
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  font-size: 1.1rem;
}
.theme-toggle:hover {
  background: var(--bg-secondary);
}

.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.5rem;
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}

.hero-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-color);
  margin-bottom: 16px;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 2rem + 4vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

.hero-content p {
  font-size: clamp(1.05rem, 1rem + 0.5vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 580px;
}

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

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-bg {
  position: absolute;
  width: 110%;
  height: 110%;
  background: var(--accent-gradient);
  filter: blur(80px);
  opacity: 0.15;
  border-radius: 50%;
  z-index: -1;
}

.hero-avatar {
  width: 320px;
  height: 320px;
  border-radius: var(--border-radius-lg);
  object-fit: cover;
  border: 4px solid var(--card-border);
  box-shadow: var(--card-shadow);
  transform: rotate(3deg);
  transition: transform 0.5s ease;
}
.hero-avatar:hover {
  transform: rotate(0deg) scale(1.03);
}

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

.about-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
}
.about-text p {
  margin-bottom: 24px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.stat-item {
  text-align: center;
}
.stat-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* --- Expertise Section --- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.expertise-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.expertise-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  box-shadow: 0 8px 16px -4px var(--accent-glow);
}

.expertise-card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
}

.expertise-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* --- Skills Section --- */
.skills-container {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: center;
}

.skills-categories {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.skills-category-btn {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 16px 24px;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  transition: all 0.3s;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
}
.skills-category-btn:hover,
.skills-category-btn.active {
  border-color: var(--accent-color);
  background: var(--accent-gradient);
  color: #fff;
}
.skills-category-btn i {
  font-size: 1.1rem;
}

.skills-display-card {
  min-height: 380px;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.skill-bar-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.95rem;
}

.skill-track {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.skill-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 4px;
  width: 0;
  transition: width 1s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Timeline Sections (Experience & Education) --- */
.timeline-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: flex-start;
}

.timeline-column h3 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.timeline-column h3 i {
  color: var(--accent-color);
}

.timeline-items {
  position: relative;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.timeline-items::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--timeline-line);
}

.timeline-item {
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -24px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--timeline-dot);
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 8px var(--accent-color);
}

.timeline-card {
  padding: 24px;
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.timeline-card h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-card h4 a:hover {
  color: var(--accent-color);
}

.timeline-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.timeline-card ul {
  margin-top: 12px;
  padding-left: 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.timeline-card li {
  margin-bottom: 8px;
}

/* --- Work / Portfolio Section --- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.project-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-img-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.project-card:hover .project-img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11, 15, 25, 0.9), rgba(11, 15, 25, 0.2));
  opacity: 0;
  display: flex;
  align-items: flex-end;
  padding: 24px;
  transition: opacity 0.3s;
}
.project-card:hover .project-overlay {
  opacity: 1;
}

.project-details {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-details h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.project-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-color);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.project-details p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent-color);
  align-self: flex-start;
  transition: color 0.2s;
}
.project-link:hover {
  color: var(--accent-secondary);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 20px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--accent-color);
}

.contact-text h4 {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.contact-text p {
  font-weight: 600;
  font-size: 1.05rem;
}

.contact-socials {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.social-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-secondary);
  transition: all 0.3s;
}
.social-btn:hover {
  color: #fff;
  background: var(--accent-gradient);
  border-color: transparent;
  transform: translateY(-3px);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-control {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 16px 20px;
  border-radius: var(--border-radius-md);
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}
.form-control:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.form-control:user-invalid {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.info-error {
  color: #ef4444;
  font-size: 0.8rem;
  font-weight: 500;
}

.alert-message {
  display: none;
  padding: 16px 24px;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-align: center;
  border: 1px solid transparent;
}
.alert-message.open {
  display: block;
  animation: fadeIn 0.3s;
}
.alert-message.success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.2);
  color: #10b981;
}
.alert-message.error {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

/* --- Footer --- */
footer {
  padding: 48px 24px;
  border-top: 1px solid var(--nav-border);
  background-color: var(--bg-secondary);
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

.footer-copyright {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* --- Animation keyframes --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Responsive Adaptations --- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .hero-content p {
    margin: 0 auto 32px;
  }
  .hero-buttons {
    justify-content: center;
  }
  .hero-avatar {
    width: 260px;
    height: 260px;
  }
  
  .about-grid,
  .timeline-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  section {
    padding: 60px 16px;
  }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .skills-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}