/* ==============================
   CSS VARIABLES & RESET
   ============================== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a26;
  --bg-nav: rgba(10, 10, 15, 0.85);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b85;
  --gradient-1: #6366f1;
  --gradient-2: #8b5cf6;
  --gradient-3: #06b6d4;
  --gradient-text: linear-gradient(135deg, #6366f1, #06b6d4);
  --gradient-bg: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.1));
  --border-color: rgba(255, 255, 255, 0.06);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-nav: rgba(248, 249, 252, 0.85);
  --text-primary: #0a0a0f;
  --text-secondary: #4a4a5a;
  --text-muted: #8a8a9e;
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

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

ul { list-style: none; }

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==============================
   NAVIGATION
   ============================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
}

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

.logo {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -1px;
}

.logo-dot {
  color: var(--gradient-3);
}

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

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-1);
  transition: width var(--transition);
  border-radius: 2px;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
}

.theme-toggle:hover {
  background: var(--gradient-1);
  color: white;
  border-color: var(--gradient-1);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.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;
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
  z-index: 0;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gradient-3);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  padding: 8px 16px;
  border-radius: 50px;
  width: fit-content;
  letter-spacing: 0.5px;
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

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

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -2px;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text-secondary);
  min-height: 1.8em;
}

.cursor {
  color: var(--gradient-1);
  animation: blink 0.8s step-end infinite;
  font-weight: 100;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 480px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  font-family: var(--font);
}

.btn-primary {
  background: var(--gradient-1);
  color: white;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--gradient-1);
  color: var(--gradient-1);
  transform: translateY(-2px);
}

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

.hero-social {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

.hero-social a {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: all var(--transition);
}

.hero-social a:hover {
  background: var(--gradient-1);
  color: white;
  border-color: var(--gradient-1);
  transform: translateY(-3px);
}

/* Hero Visual */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-avatar {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  animation: spin 20s linear infinite;
}

.avatar-ring::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 50%;
  width: 20px;
  height: 20px;
  background: var(--gradient-1);
  border-radius: 50%;
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.6);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.avatar-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--gradient-bg);
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--gradient-1);
  z-index: 1;
}

.floating-card {
  position: absolute;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: var(--shadow);
  animation: float 4s ease-in-out infinite;
  z-index: 2;
}

.card-1 { top: 10%; right: 5%; animation-delay: 0s; color: #ff2d20; }
.card-2 { bottom: 15%; left: 5%; animation-delay: 1s; color: #777bb4; }
.card-3 { bottom: 5%; right: 15%; animation-delay: 2s; color: #21759b; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: bounce 2s infinite;
}

.scroll-indicator i {
  font-size: 0.8rem;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ==============================
   SECTIONS COMMON
   ============================== */
section {
  padding: 100px 0;
}

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

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gradient-1);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -1px;
}

.divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-text);
  border-radius: 4px;
  margin: 16px auto 0;
}

.section-desc {
  color: var(--text-muted);
  max-width: 520px;
  margin: 16px auto 0;
  font-size: 1.05rem;
}

/* ==============================
   ABOUT
   ============================== */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
}

.about-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.about-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--gradient-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--gradient-1);
  margin: 0 auto 20px;
}

.about-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

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

/* ==============================
   SKILLS
   ============================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 20px;
}

.skill-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
  cursor: default;
}

.skill-item:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.skill-icon {
  font-size: 2.2rem;
  margin-bottom: 10px;
  color: var(--gradient-1);
}

.skill-item:nth-child(1) .skill-icon { color: #ff2d20; }
.skill-item:nth-child(2) .skill-icon { color: #777bb4; }
.skill-item:nth-child(3) .skill-icon { color: #21759b; }
.skill-item:nth-child(4) .skill-icon { color: #e34f26; }
.skill-item:nth-child(5) .skill-icon { color: #1572b6; }
.skill-item:nth-child(6) .skill-icon { color: #f7df1e; }
.skill-item:nth-child(7) .skill-icon { color: #4479a1; }
.skill-item:nth-child(8) .skill-icon { color: #f05033; }

.skill-item span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ==============================
   PROJECTS
   ============================== */
.projects {
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.project-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.project-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--text-muted);
  background: var(--gradient-bg);
  transition: transform 0.5s ease;
}

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

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  opacity: 0;
  transition: opacity var(--transition);
  backdrop-filter: blur(4px);
}

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

.project-link {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 1.1rem;
  transition: all var(--transition);
  transform: translateY(20px);
  transition: all 0.3s ease;
}

.project-card:hover .project-link {
  transform: translateY(0);
}

.project-link:hover {
  background: var(--gradient-1);
  color: white;
}

.project-info {
  padding: 24px;
}

.project-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.project-info p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

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

.project-tags span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gradient-3);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.15);
  padding: 4px 12px;
  border-radius: 50px;
}

/* ==============================
   CONTACT
   ============================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  position: relative;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 16px 20px 16px 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font);
  transition: all var(--transition);
  outline: none;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--gradient-1);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

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

.form-group i {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
}

.form-group textarea + i {
  top: 20px;
  transform: none;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 14px;
  background: var(--gradient-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gradient-1);
  font-size: 1.1rem;
}

.contact-item h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.contact-item a,
.contact-item p {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.contact-item a:hover {
  color: var(--gradient-1);
}

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

.contact-social a {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: all var(--transition);
}

.contact-social a:hover {
  background: var(--gradient-1);
  color: white;
  border-color: var(--gradient-1);
  transform: translateY(-3px);
}

/* ==============================
   FOOTER
   ============================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

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

.footer-text i {
  color: #ef4444;
}

.footer-links {
  display: flex;
  gap: 24px;
}

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

.footer-links a:hover {
  color: var(--gradient-1);
}

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

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

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    align-items: center;
  }

  .hero-desc {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-social {
    justify-content: center;
  }

  .hero-avatar {
    width: 260px;
    height: 260px;
  }

  .avatar-placeholder {
    width: 160px;
    height: 160px;
    font-size: 3rem;
  }

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

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

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-nav);
    backdrop-filter: blur(30px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    transition: right 0.4s ease;
    border-left: 1px solid var(--border-color);
  }

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

  .nav-link {
    font-size: 1.1rem;
  }

  .hamburger {
    display: flex;
  }

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

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

  .hero-avatar {
    width: 200px;
    height: 200px;
  }

  .avatar-placeholder {
    width: 130px;
    height: 130px;
    font-size: 2.5rem;
  }

  .floating-card {
    width: 44px;
    height: 44px;
    font-size: 1.4rem;
  }

  section {
    padding: 70px 0;
  }

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

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

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

  .skills-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 14px;
  }

  .section-header {
    margin-bottom: 40px;
  }
}

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

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

  .hero-actions {
    flex-direction: column;
  }

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