/* ============================================
   CSS Variables & Base
   ============================================ */
:root {
  --color-bg: #0a0a1a;
  --color-bg-alt: #111128;
  --color-surface: rgba(255, 255, 255, 0.05);
  --color-surface-hover: rgba(255, 255, 255, 0.1);
  --color-text: #e0e0f0;
  --color-text-muted: #8888aa;
  --color-accent: #667eea;
  --color-accent-alt: #764ba2;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: 0.3s ease;
  --container-width: 1100px;
}

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

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

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-alt);
}

/* ============================================
   Canvas
   ============================================ */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ============================================
   Navigation
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: background var(--transition);
}

.header.scrolled {
  background: rgba(10, 10, 26, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.05em;
}

.nav-logo:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  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-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
/* ============================================
   Globe (fixed)
   ============================================ */
.globe-fixed {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  transition: none;
}

.globe-fixed canvas {
  width: 80vmin;
  height: 80vmin;
  display: block;
  pointer-events: auto;
  cursor: grab;
  border-radius: 50%;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  z-index: 1;
  padding: 2rem;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--color-accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.hero-name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  letter-spacing: 0.1em;
}

.hero-cta {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 50px;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  transition: all var(--transition);
}

.hero-cta:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ============================================
   Sections
   ============================================ */
.section {
  position: relative;
  z-index: 1;
  padding: 6rem 2rem;
}

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

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
  margin: 0.8rem auto 0;
  border-radius: 2px;
}

/* ============================================
   About
   ============================================ */
.about-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.about-content p {
  color: var(--color-text-muted);
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
}

/* ============================================
   Skills
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all var(--transition);
}

.skill-card:hover {
  background: var(--color-surface-hover);
  transform: translateY(-4px);
  border-color: rgba(102, 126, 234, 0.3);
}

.skill-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.skill-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.8rem;
  color: var(--color-text);
}

.skill-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ============================================
   Projects
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(102, 126, 234, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-image {
  width: 100%;
  height: 180px;
}

.project-info {
  padding: 1.5rem;
}

.project-info h3 {
  font-size: 1.15rem;
  margin-bottom: 0.7rem;
}

.project-info p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tags span {
  font-size: 0.75rem;
  padding: 0.3rem 0.8rem;
  background: rgba(102, 126, 234, 0.15);
  color: var(--color-accent);
  border-radius: 20px;
}

/* ============================================
   Contact
   ============================================ */
.contact-content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.contact-content > p {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.8rem;
  border: 1px solid var(--color-border);
  border-radius: 50px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(102, 126, 234, 0.08);
}

.contact-icon {
  font-size: 1.2rem;
}

/* ============================================
   Contact Form
   ============================================ */
.contact-desc {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

.contact-form {
  max-width: 700px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 1.2rem;
}

.form-group label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.03em;
}

.required {
  color: var(--color-accent);
}

.form-group input,
.form-group textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(136, 136, 170, 0.4);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.form-submit {
  display: block;
  width: 100%;
  padding: 0.9rem;
  margin-top: 0.5rem;
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 50px;
  font-size: 1rem;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all var(--transition);
}

.form-submit:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* ============================================
   Confirm Modal
   ============================================ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2rem;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-title {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.modal-body {
  margin-bottom: 1.5rem;
}

.modal-body dt {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.2rem;
}

.modal-body dd {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  white-space: pre-wrap;
  word-break: break-word;
}

.modal-body dd:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.modal-actions {
  display: flex;
  gap: 1rem;
}

.modal-btn {
  flex: 1;
  padding: 0.75rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
}

.modal-cancel {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.modal-cancel:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.modal-confirm {
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  color: var(--color-bg);
}

.modal-confirm:hover {
  opacity: 0.85;
}

/* ============================================
   Color Palette
   ============================================ */
.color-palette {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.color-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  padding: 0;
  outline: none;
}

.color-btn:hover {
  transform: scale(1.25);
}

.color-btn.active {
  border-color: rgba(255, 255, 255, 0.8);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

/* ============================================
   Fade-in Animation
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ============================================
   Mobile Responsive
   ============================================ */
@media (max-width: 900px) {
  .globe-fixed canvas {
    width: 90vmin;
    height: 90vmin;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(10, 10, 26, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1.5rem 2rem;
    gap: 1.2rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .section {
    padding: 4rem 1.2rem;
  }

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

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

  .form-row {
    grid-template-columns: 1fr;
  }
}

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

  .nav {
    padding: 1rem 1.2rem;
  }
}