/* ==========================================================================
   Dylan Calin - Clean, Modern & Professional Portfolio Design System
   ========================================================================== */

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

:root {
  /* Color Palette - Refined Dark Theme */
  --bg-base: #090d16;
  --bg-surface: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(56, 189, 248, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  
  --gradient-brand: linear-gradient(135deg, #38bdf8 0%, #3b82f6 50%, #818cf8 100%);
  --glow-subtle: 0 0 25px rgba(56, 189, 248, 0.15);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --transition-fast: 0.15s ease-out;
  --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);

  --max-width: 1140px;
}

/* Light Theme */
body.light-theme {
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(59, 130, 246, 0.35);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
}

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

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

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

a:hover {
  color: #ffffff;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Ambient Background Light */
.bg-ambient {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(130px);
  opacity: 0.12;
}

.orb-top-left {
  top: -120px;
  left: -80px;
  width: 500px;
  height: 500px;
  background: #0284c7;
}

.orb-mid-right {
  top: 35%;
  right: -100px;
  width: 450px;
  height: 450px;
  background: #6366f1;
}

.orb-bottom-left {
  bottom: 10%;
  left: -80px;
  width: 400px;
  height: 400px;
  background: #0d9488;
}

/* Glass Panel Utility */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
  position: relative;
  z-index: 1;
}

.glass-panel:hover {
  border-color: var(--border-focus);
  box-shadow: var(--glow-subtle);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1rem 0;
  background: rgba(9, 13, 22, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

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

.nav-brand {
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  align-items: center;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn-icon {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--accent-blue);
  color: white;
  border-color: var(--accent-blue);
}

.nav-toggle-btn {
  display: none;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  padding: 0.6rem 1.35rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
  transition: all var(--transition-smooth);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
  color: #ffffff;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.6rem 1.35rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-smooth);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.06);
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 65px;
  left: 0;
  width: 100%;
  background: rgba(9, 13, 22, 0.96);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.5rem;
  z-index: 99;
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-links a {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: block;
  padding: 0.5rem 0;
}

.mobile-nav-links a:hover {
  color: var(--accent-cyan);
}

/* Hero Section */
.hero {
  padding: 8.5rem 0 4.5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 3rem;
  align-items: center;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--accent-cyan);
  padding: 0.35rem 0.95rem;
  border-radius: 50px;
  font-size: 0.825rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-card {
  padding: 2.25rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.stat-item {
  text-align: center;
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.stat-number {
  font-family: 'Outfit', sans-serif;
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Sections */
.section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* Skills Cards */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  padding: 1.75rem;
}

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

.skill-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.tag:hover {
  background: rgba(56, 189, 248, 0.12);
  color: var(--text-primary);
  border-color: var(--accent-cyan);
}

/* Status Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.65rem;
  border-radius: 6px;
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-prod {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-dev {
  background: rgba(245, 158, 11, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.status-lab {
  background: rgba(236, 72, 153, 0.12);
  color: #f472b6;
  border: 1px solid rgba(236, 72, 153, 0.3);
}

.status-enterprise {
  background: rgba(59, 130, 246, 0.12);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

/* App Icon Container */
.app-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  overflow: hidden;
  flex-shrink: 0;
  background: #111c30;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-icon-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Experience Timeline */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background: var(--border-subtle);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 2.5rem;
}

.timeline-dot {
  position: absolute;
  left: 11px;
  top: 8px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-cyan);
  border: 4px solid var(--bg-base);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.timeline-card {
  padding: 2rem;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.role-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.company-name {
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 1rem;
}

.period-badge {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}

.timeline-list {
  list-style: none;
  margin-top: 1rem;
}

.timeline-list li {
  position: relative;
  padding-left: 1.3rem;
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.timeline-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

/* Portfolio Section */
.portfolio-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.filter-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.5rem 1.1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-blue);
  color: white;
  border-color: var(--accent-blue);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.search-box-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.55rem 1.2rem;
  border-radius: 50px;
  font-size: 0.875rem;
  width: 240px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent-cyan);
}

.projects-counter {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.75rem;
}

.project-card {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.project-header-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.2rem;
}

.project-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.55;
}

.project-tech {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

/* Contact Footer */
.footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  text-align: center;
}

.contact-box {
  max-width: 600px;
  margin: 0 auto 3rem;
  padding: 2.5rem;
}

.contact-email-box {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 0.6rem 1.25rem;
  border-radius: 50px;
  margin: 1rem 0;
}

.contact-email {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.copy-btn {
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-cyan);
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--accent-cyan);
  color: #000;
}

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

/* Toast Notification */
.toast-msg {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #10b981;
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 999;
}

.toast-msg.show {
  transform: translateY(0);
  opacity: 1;
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--accent-cyan);
  color: #000;
  border-color: var(--accent-cyan);
}

/* Responsive Styles */
@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .nav-links {
    display: none;
  }
  .nav-toggle-btn {
    display: flex;
  }
  .portfolio-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .search-input {
    width: 100%;
  }
}