/* ============================================
   Quahhar — Professional Portfolio
   Corporate / Clean / Minimal
   ============================================ */

/* --- CSS Custom Properties: Dark Theme (Default) --- */
:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #141414;
  --bg-tertiary: #1a1a1a;

  --text-primary: #f5f5f5;
  --text-secondary: #999999;
  --text-muted: #666666;

  --accent: #cccccc;
  --accent-dim: #555555;

  --border: #2a2a2a;
  --border-light: #333333;

  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;

  --transition: 0.2s ease;
}

/* --- Light Theme --- */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f2f2f2;

  --text-primary: #111111;
  --text-secondary: #555555;
  --text-muted: #999999;

  --accent: #333333;
  --accent-dim: #cccccc;

  --border: #e5e5e5;
  --border-light: #eeeeee;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

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

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
}

strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================
   Layout Utilities
   ============================================ */
.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 120px 0;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ============================================
   Section Headings
   ============================================ */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-weight: 500;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 32px;
  color: var(--text-primary);
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  letter-spacing: 0.3px;
}

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

.nav-links a.active {
  position: relative;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 6px 10px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--accent-dim);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: inline-block;
  width: 14px;
  height: 14px;
}

/* Mobile Nav */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 4px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: var(--transition);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    gap: 0;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 14px 32px;
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 60px;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 80px;
}

.hero-text {
  flex: 1;
}

.hero-image {
  flex-shrink: 0;
}

.hero-image .profile-photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
}

.hero-image .profile-placeholder {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 1px;
}

.hero-name {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 600;
  letter-spacing: -1px;
  margin-bottom: 12px;
  line-height: 1.15;
}

.hero-title {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.2px;
}

.hero-location {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  letter-spacing: 0.3px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 26px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  letter-spacing: 0.3px;
  font-family: var(--font-sans);
}

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

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

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

.btn-outline:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 10px 0;
  font-size: 0.85rem;
}

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

@media (max-width: 768px) {
  .hero-content {
    flex-direction: column-reverse;
    gap: 40px;
    text-align: center;
  }

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

  .hero-image .profile-photo,
  .hero-image .profile-placeholder {
    width: 160px;
    height: 160px;
  }
}

/* ============================================
   About Section
   ============================================ */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.75;
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Sub-section */
.sub-section {
  border-left: 1px solid var(--border);
  padding-left: 20px;
  transition: border-color var(--transition);
}

.sub-section:hover {
  border-left-color: var(--accent-dim);
}

.sub-section h3 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 14px;
  font-weight: 500;
}

/* Languages */
.language-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.language-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.lang-level {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* Education */
.edu-item .edu-degree {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.edu-item .edu-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* Resume Download */
.resume-download {
  padding-top: 8px;
}

@media (max-width: 768px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

/* ============================================
   Skills Page
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.skill-card {
  border: 1px solid var(--border);
  padding: 28px;
  transition: border-color var(--transition);
}

.skill-card:hover {
  border-color: var(--accent-dim);
}

.skill-card-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.skill-icon {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--text-muted);
}

.skill-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.2px;
  margin-bottom: 4px;
}

.skill-card-category {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  transition: all var(--transition);
  letter-spacing: 0.3px;
}

.skill-tag:hover {
  color: var(--text-primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
}

.footer p {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* ============================================
   Scroll Reveal (subtle)
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}