/* ==============================================
   Material Design 3 - Minimalist Portfolio
   Typography: Plus Jakarta Sans + Bricolage Grotesque
   Color: Tonal teal system with clean surfaces
   ============================================== */

:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-dim: #eef0f6;
  --surface-container: #e8eaf2;
  --surface-container-high: #dfe2ec;
  --surface-container-highest: #d6d9e5;

  --text: #111827;
  --text-secondary: #374151;
  --muted: #6b7280;

  --primary: #4f46e5;
  --primary-container: #e0e7ff;
  --on-primary: #ffffff;
  --on-primary-container: #312e81;

  --secondary: #7c3aed;
  --secondary-container: #ede9fe;
  --on-secondary-container: #4c1d95;

  --tertiary: #0ea5e9;
  --tertiary-container: #e0f2fe;

  --outline: #6b7280;
  --outline-variant: #c7d2d8;
  --border: #e5e7eb;

  --elevation-1: 0 1px 3px 1px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --elevation-2: 0 2px 6px 2px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --elevation-3: 0 4px 8px 3px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.06);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --section-gap: 80px;
  --ease: cubic-bezier(0.2, 0, 0, 1);
  --duration: 0.3s;
}

body[data-theme="dark"] {
  --bg: #0f1117;
  --surface: #1a1c2e;
  --surface-dim: #0f1117;
  --surface-container: #1e2035;
  --surface-container-high: #282a40;
  --surface-container-highest: #32344c;

  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --muted: #94a3b8;

  --primary: #818cf8;
  --primary-container: #3730a3;
  --on-primary: #1e1b4b;
  --on-primary-container: #e0e7ff;

  --secondary: #a78bfa;
  --secondary-container: #5b21b6;
  --on-secondary-container: #ede9fe;

  --tertiary: #38bdf8;
  --tertiary-container: #0c4a6e;

  --outline: #94a3b8;
  --outline-variant: #374151;
  --border: #2d3044;

  --elevation-1: 0 1px 3px 1px rgba(0,0,0,0.25), 0 1px 2px rgba(0,0,0,0.2);
  --elevation-2: 0 2px 6px 2px rgba(0,0,0,0.25), 0 1px 2px rgba(0,0,0,0.2);
  --elevation-3: 0 4px 8px 3px rgba(0,0,0,0.25), 0 1px 3px rgba(0,0,0,0.2);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: "Plus Jakarta Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  padding-top: 64px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--duration) var(--ease); }
a:hover { color: var(--primary); }

/* ============ Animations ============ */
[data-animate] {
  opacity: 0;
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-animate].in-view { opacity: 1; }
[data-animate="fade-up"] { transform: translateY(32px); }
[data-animate="fade-up"].in-view { transform: translateY(0); }
[data-animate="scale-in"] { transform: scale(0.96); }
[data-animate="scale-in"].in-view { transform: scale(1); }

[data-stagger-children] > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
[data-stagger-children].in-view > * { opacity: 1; transform: translateY(0); }
[data-stagger-children].in-view > *:nth-child(1) { transition-delay: 0.05s; }
[data-stagger-children].in-view > *:nth-child(2) { transition-delay: 0.1s; }
[data-stagger-children].in-view > *:nth-child(3) { transition-delay: 0.15s; }
[data-stagger-children].in-view > *:nth-child(4) { transition-delay: 0.2s; }
[data-stagger-children].in-view > *:nth-child(5) { transition-delay: 0.25s; }
[data-stagger-children].in-view > *:nth-child(6) { transition-delay: 0.3s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.floating { animation: float 5s ease-in-out infinite; }

.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  z-index: 100;
  border-radius: 0 2px 2px 0;
}

/* ============ Layout ============ */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.section { padding: var(--section-gap) 0; }

.skip-link {
  position: absolute; left: -999px; top: 16px;
  background: var(--surface); color: var(--text);
  padding: 8px 16px; border-radius: var(--radius-full);
  z-index: 20; font-size: 13px;
}
.skip-link:focus { left: 16px; }

/* ============ Header ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--duration) var(--ease);
}
.site-header.scrolled { box-shadow: var(--elevation-2); }

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 12px 24px; min-height: 64px;
  max-width: 1280px; margin: 0 auto;
}

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.brand-mark {
  width: 40px; height: 40px; border-radius: var(--radius-md);
  background: var(--primary); display: grid; place-items: center;
  font-family: "Bricolage Grotesque", serif;
  font-weight: 800; color: var(--on-primary);
  font-size: 14px; letter-spacing: -0.5px;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-name { font-weight: 700; font-size: 14px; letter-spacing: -0.2px; }
.brand-role { color: var(--muted); font-size: 12px; font-weight: 500; }

.site-nav {
  display: flex; align-items: center; gap: 2px;
  font-size: 13px; color: var(--text-secondary);
  flex: 1; justify-content: center;
  min-width: 0; overflow-x: auto; overflow-y: hidden;
  scrollbar-width: none; -ms-overflow-style: none;
}
.site-nav::-webkit-scrollbar { display: none; }

.site-nav a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px; border-radius: var(--radius-full);
  transition: all var(--duration) var(--ease);
  font-weight: 500; position: relative; letter-spacing: 0.01em;
  white-space: nowrap; flex-shrink: 0;
}
.site-nav a i { display: none !important; }
.site-nav a::after { display: none; }
.site-nav a:hover { background: var(--surface-container-high); color: var(--text); }
.site-nav a.active {
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-weight: 600;
}

.header-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.header-actions .btn { padding: 8px 16px; font-size: 13px; gap: 6px; }
.header-actions .btn i { width: 16px; height: 16px; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 10px 24px; border-radius: var(--radius-full);
  border: none; font-weight: 600; font-size: 14px; cursor: pointer;
  transition: all var(--duration) var(--ease);
  background: transparent; color: inherit; position: relative;
  overflow: hidden; letter-spacing: 0.01em; min-height: 40px;
  text-decoration: none; font-family: inherit;
}

.btn i {
  width: 18px; height: 18px;
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  line-height: 1;
}
.btn span { display: inline-block; line-height: 1; }

.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.primary:hover { box-shadow: var(--elevation-1); filter: brightness(1.08); }

.btn.outline { border: 1px solid var(--outline-variant); background: transparent; color: var(--primary); }
.btn.outline:hover { background: var(--surface-container); }

.btn.ghost { background: transparent; color: var(--text-secondary); gap: 6px; padding: 8px 12px; }
.btn.ghost:hover { background: var(--surface-container); }

.btn:active { transform: scale(0.97); }
.btn:focus-visible, .site-nav a:focus-visible, .contact-links a:focus-visible {
  outline: 2px solid var(--primary); outline-offset: 2px;
}

/* ============ Hero ============ */
.hero { padding-top: 48px; position: relative; }

.hero-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr;
  gap: 56px; align-items: center;
}

.eyebrow {
  text-transform: uppercase; letter-spacing: 2.5px;
  font-size: 11px; color: var(--primary); font-weight: 700;
  display: block; text-align: center;
}

.hero h1 {
  font-family: "Bricolage Grotesque", serif;
  font-size: clamp(36px, 5.5vw, 64px); font-weight: 800;
  margin: 12px 0 8px; letter-spacing: -1.5px;
  line-height: 1.1; color: var(--text);
  text-align: center;
}

.lead {
  font-size: 16px; color: var(--muted);
  margin-bottom: 28px; line-height: 1.7; max-width: 520px;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 32px; }

.hero-meta { display: flex; flex-wrap: wrap; gap: 24px; font-size: 13px; }
.meta-item { display: flex; align-items: center; gap: 8px; }
.meta-item i { width: 18px; height: 18px; color: var(--primary); flex-shrink: 0; }
.meta-label { display: none; }

.copy-email { cursor: copy; }
.copy-email:hover { color: var(--primary); }

.hero-card {
  background: var(--surface); border: 1px solid var(--border);
  padding: 36px; border-radius: var(--radius-lg);
  box-shadow: var(--elevation-2);
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
}

.flutter-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; background: var(--primary); color: var(--on-primary);
  border-radius: var(--radius-full); font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.8px; margin-bottom: 24px;
}
.flutter-badge svg { flex-shrink: 0; }

.avatar {
  width: 96px; height: 96px; border-radius: 50%;
  background: var(--primary-container); display: grid; place-items: center;
  font-family: "Bricolage Grotesque", serif; font-size: 28px; font-weight: 800;
  margin: 0 auto 24px; color: var(--on-primary-container); position: relative;
}

.avatar-ring {
  position: absolute; inset: -5px; border-radius: 50%;
  border: 2px solid var(--outline-variant); opacity: 0.4;
}
.avatar-text { position: relative; z-index: 2; }

.card-title {
  font-family: "Bricolage Grotesque", serif;
  font-size: 18px; font-weight: 700;
  margin-bottom: 8px; letter-spacing: -0.3px;
}

.card-description {
  color: var(--muted); font-size: 13px;
  line-height: 1.65; margin-bottom: 16px;
}justify-content: center; 

.tech-stack { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }

.tech-tag {
  padding: 4px 12px;
  background: var(--secondary-container); color: var(--on-secondary-container);
  border-radius: var(--radius-full); font-size: 11px; font-weight: 600;
  letter-spacing: 0.3px; transition: all var(--duration) var(--ease);
}
.tech-tag:hover { background: var(--primary); color: var(--on-primary); }

.quick-contact { display: grid; gap: 12px; justify-items: center; }

.contact-links { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.contact-links a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-full);
  background: var(--surface-container); font-weight: 600; font-size: 13px;
  transition: all var(--duration) var(--ease);
}
.contact-links a i { width: 12px; height: 12px; }
.contact-links a:hover { background: var(--primary); color: var(--on-primary); }

/* ============ Section Header ============ */
.section-header { display: flex; flex-direction: column; gap: 4px; margin-bottom: 36px; }
.section-label {
  text-transform: uppercase; letter-spacing: 2px;
  font-size: 11px; color: var(--primary); font-weight: 700;
}
.section-header h2 {
  font-family: "Bricolage Grotesque", serif;
  font-size: clamp(24px, 3.5vw, 40px); font-weight: 700;
  letter-spacing: -0.8px; line-height: 1.15;
}
.section-body { display: grid; gap: 8px; font-size: 16px; color: var(--text-secondary); max-width: 640px; }

/* ============ Cards ============ */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
  box-shadow: var(--elevation-1); position: relative;
  transition: box-shadow var(--duration) var(--ease),
              transform var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}
.card:hover { box-shadow: var(--elevation-2); transform: translateY(-2px); }
.card.highlight { background: var(--surface-container); border-color: transparent; }

.card-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: var(--primary-container); color: var(--on-primary-container);
  display: grid; place-items: center; margin-bottom: 16px;
}
.card-icon i { width: 24px; height: 24px; }

/* ============ Skills ============ */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }

.chip-group { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.chip {
  padding: 6px 14px; border-radius: var(--radius-sm);
  background: var(--surface-container); font-size: 12px; font-weight: 500;
  color: var(--text-secondary); letter-spacing: 0.2px;
  transition: all var(--duration) var(--ease); border: 1px solid var(--border);
}
.chip:hover {
  background: var(--primary-container); color: var(--on-primary-container);
  border-color: transparent;
}

/* ============ Timeline ============ */
.timeline { list-style: none; position: relative; padding-left: 20px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 4px; bottom: 4px;
  width: 2px; background: var(--border); border-radius: 1px;
}
.timeline.animate-line::before {
  background: linear-gradient(to bottom, var(--primary) 0%, var(--primary) var(--line-progress, 0%), var(--border) var(--line-progress, 0%));
}

.timeline-item { position: relative; padding-left: 24px; margin-bottom: 28px; }
.timeline-dot {
  position: absolute; left: -2px; top: 7px; width: 10px; height: 10px;
  border-radius: 50%; background: var(--primary);
  transform: scale(0); transition: transform 0.4s var(--ease);
  box-shadow: 0 0 0 3px var(--bg);
}
.timeline-item.in-view .timeline-dot { transform: scale(1); }

.timeline-content h3 { font-weight: 700; font-size: 16px; letter-spacing: -0.2px; }
.role { color: var(--muted); font-size: 13px; margin: 2px 0 8px; }
.timeline-content ul { padding-left: 16px; display: grid; gap: 4px; font-size: 14px; color: var(--text-secondary); }

/* ============ Projects ============ */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }

.project-card { display: grid; gap: 10px; cursor: default; }
.project-card:hover { border-color: var(--primary); }

a.project-card {
  text-decoration: none; color: inherit; cursor: pointer;
}
a.project-card:hover { color: inherit; }

.project-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.project-title-group { display: flex; align-items: center; gap: 10px; }
.project-logo { width: 36px; height: 36px; border-radius: var(--radius-sm); object-fit: contain; }

.project-card h3 { font-weight: 700; font-size: 15px; letter-spacing: -0.2px; }
.project-card p { font-size: 13px; color: var(--muted); line-height: 1.6; }

.badge {
  background: var(--primary-container); color: var(--on-primary-container);
  padding: 4px 10px; border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 600; letter-spacing: 0.5px; white-space: nowrap;
}

.tag-list { display: flex; flex-wrap: wrap; gap: 6px; font-size: 11px; color: var(--muted); }
.tag-list span { padding: 2px 8px; background: var(--surface-container); border-radius: 4px; }

.additional-projects { margin-top: 36px; display: grid; gap: 12px; }
.additional-projects h3 { font-size: 16px; font-weight: 700; letter-spacing: -0.2px; }
.additional-projects ul { padding-left: 16px; display: grid; gap: 6px; font-size: 14px; color: var(--text-secondary); }

/* ============ Contact ============ */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.muted { color: var(--muted); }

/* ============ Footer ============ */
.site-footer { border-top: 1px solid var(--border); padding: 24px 0; }
.footer-inner { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }

/* ============ FAB ============ */
.fab {
  position: fixed; bottom: 24px; right: 24px;
  width: 56px; height: 56px; border-radius: var(--radius-lg);
  background: var(--primary-container); color: var(--on-primary-container);
  border: none; cursor: pointer; display: grid; place-items: center;
  box-shadow: var(--elevation-3); z-index: 50;
  opacity: 0; transform: translateY(80px) scale(0.8);
  transition: all 0.4s var(--ease);
}
.fab.visible { opacity: 1; transform: translateY(0) scale(1); }
.fab:hover { box-shadow: var(--elevation-3); filter: brightness(0.95); }
.fab:active { transform: scale(0.95); }
.fab i { width: 24px; height: 24px; }

/* ============ Toast ============ */
.toast {
  position: fixed; bottom: 96px; right: 24px;
  background: var(--surface-container-highest); color: var(--text);
  padding: 14px 24px; border-radius: var(--radius-md);
  box-shadow: var(--elevation-3); z-index: 100;
  opacity: 0; transform: translateY(16px);
  transition: all 0.35s var(--ease); pointer-events: none;
  min-width: 200px; font-weight: 500; font-size: 14px;
}
.toast.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.toast::before {
  content: '\2713'; display: inline-block; margin-right: 8px;
  color: var(--primary); font-weight: 700;
}

/* ============ Mobile Nav Toggle ============ */
.nav-toggle { display: none; }

/* ============ Responsive ============ */

/* ---------- Tablet (<=1024px) ---------- */
@media (max-width: 1024px) {
  :root { --section-gap: 64px; }
  .container { padding: 0 20px; }

  /* Show hamburger, hide nav by default */
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: fixed;
    top: 65px;
    right: 12px;
    left: 12px;
    width: auto;
    max-width: 280px;
    margin-left: auto;
    flex-direction: column; gap: 4px;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--elevation-3);
    z-index: 100;
  }
  .site-nav.open { display: flex; }
  .site-nav a {
    padding: 10px 14px; font-size: 14px;
    border-radius: var(--radius-md); width: 100%;
    white-space: nowrap;
  }
  .site-nav a i { display: inline-flex; width: 18px; height: 18px; flex-shrink: 0; }

  /* Hide download CV label, keep icon */
  .header-actions .btn.outline span { display: none; }
  .header-actions .btn.outline { padding: 8px 12px; min-width: auto; }

  /* Hide theme label */
  .header-actions .btn.ghost span { display: none; }
  .header-actions .btn.ghost { padding: 8px 10px; }

  .hero-grid { gap: 36px; }
  .projects-grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
}

/* ---------- Small tablet / large phone (<=900px) ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-card { max-width: 480px; }
  .lead { max-width: 100%; }
}

/* ---------- Phone (<=768px) ---------- */
@media (max-width: 768px) {
  :root { --section-gap: 48px; }
  .container { padding: 0 16px; }

  .header-inner { min-height: 56px; padding: 8px 0; }
  .site-nav { top: 57px; }

  /* Hero adjustments */
  .hero { padding-top: 24px; }
  .hero h1 { font-size: clamp(28px, 8vw, 42px); }
  .lead { font-size: 15px; margin-bottom: 20px; }

  .hero-cta { gap: 8px; }
  .hero-cta .btn { padding: 10px 20px; font-size: 13px; }

  .hero-meta { flex-direction: column; gap: 10px; font-size: 12px; }

  .hero-card { padding: 24px; }
  .avatar { width: 72px; height: 72px; font-size: 22px; margin-bottom: 16px; }

  /* Skills grid: 2 cols on phone */
  .skills-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .card { padding: 16px; }
  .card-icon { width: 40px; height: 40px; margin-bottom: 12px; }

  /* Projects grid: single col */
  .projects-grid { grid-template-columns: 1fr; gap: 12px; }

  /* Contact grid: single col */
  .contact-grid { grid-template-columns: 1fr; gap: 12px; }

  /* Section headers */
  .section-header { margin-bottom: 24px; }

  /* Chips & tags */
  .chip { padding: 5px 10px; font-size: 11px; }
  .tech-tag { padding: 3px 10px; font-size: 10px; }

  /* Timeline */
  .timeline { padding-left: 16px; }
  .timeline-item { padding-left: 20px; margin-bottom: 24px; }
  .timeline-content h3 { font-size: 14px; }
  .timeline-content ul { font-size: 13px; }

  /* FAB & toast */
  .fab { bottom: 16px; right: 16px; width: 48px; height: 48px; border-radius: var(--radius-md); }
  .toast { bottom: 76px; right: 16px; left: 16px; min-width: auto; font-size: 13px; padding: 12px 16px; }

  /* Footer */
  .footer-inner { font-size: 12px; }
}

/* ---------- Small phone (<=480px) ---------- */
@media (max-width: 480px) {
  .container { padding: 0 12px; }
  .hero h1 { font-size: 26px; letter-spacing: -1px; }
  .lead { font-size: 14px; line-height: 1.6; }

  .brand-text { display: none; }

  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; justify-content: center; }

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

  .hero-card { padding: 20px; }
  .contact-links { flex-direction: column; }
  .contact-links a { width: 100%; justify-content: center; }

  .tech-stack { gap: 4px; }
  .chip-group { gap: 4px; }

  .project-head { flex-direction: column; align-items: flex-start; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .floating { animation: none; }
  [data-animate] { opacity: 1 !important; transform: none !important; }
  .timeline-dot { transform: scale(1) !important; }
}