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

:root {
  --bg:        #0f0f13;
  --surface:   #1a1a24;
  --border:    #2a2a38;
  --text:      #e8e8f0;
  --muted:     #888899;
  --accent:    #7c6af7;
  --accent-h:  #9b8dff;
  --card-bg:   #16161f;

  --radius:    12px;
  --radius-sm: 6px;
  --gap:       1.5rem;
  --section-v: 7rem;

  --font-body: 'Inter', system-ui, sans-serif;
  --font-code: 'Fira Code', monospace;

  --transition: 0.25s ease;
}

[data-theme="light"] {
  --bg:       #f4f4f8;
  --surface:  #ffffff;
  --border:   #dddde8;
  --text:     #111118;
  --muted:    #666677;
  --card-bg:  #ffffff;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--transition), color var(--transition);
}

/* ── Utilities ───────────────────────────────────────────── */
.container {
  width: min(1100px, 100% - 3rem);
  margin-inline: auto;
}

.section {
  padding-block: var(--section-v);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.section-sub {
  color: var(--muted);
  margin-bottom: 3rem;
}

.centered { text-align: center; }

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-h);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 40%, transparent);
}

.btn-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

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

/* ── Nav ─────────────────────────────────────────────────── */
.nav-wrapper {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  height: 64px;
  gap: 2rem;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
  font-family: var(--font-code);
  margin-right: auto;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); font-weight: 600; }

.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 38px; height: 38px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 1.5rem;
    gap: 1.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
}

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 60% 40%, color-mix(in srgb, var(--accent) 12%, transparent), transparent);
  pointer-events: none;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  position: relative;
}

.hero-eyebrow {
  font-family: var(--font-code);
  color: var(--accent);
  font-size: 1rem;
  letter-spacing: 0.05em;
}

.hero-name {
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero-title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 500;
  color: var(--muted);
  letter-spacing: -0.01em;
}

.hero-sub {
  max-width: 520px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.hero-scroll-hint {
  margin-top: 3rem;
}

.scroll-line {
  display: block;
  width: 2px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  margin: 0 auto;
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.8); }
  50%       { opacity: 1;   transform: scaleY(1); }
}

/* ── About ───────────────────────────────────────────────── */
.about { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.about-grid {
  max-width: 720px;
  margin-inline: auto;
}

.about-content { display: flex; flex-direction: column; gap: 1rem; }

/* ── Skills ──────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 280px));
  justify-content: center;
  gap: var(--gap);
}

@media (max-width: 720px) {
  .skills-grid {
    grid-template-columns: repeat(2, minmax(0, 280px));
  }
}

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

.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
  text-align: center;
}

.skill-category:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.skill-category h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.skill-category ul { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; align-items: center; }

.skill-tag {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--text);
  text-align: left;
}

.skill-tag::before { content: '▸ '; color: var(--accent); font-size: 0.7rem; }

/* ── Projects ────────────────────────────────────────────── */
.projects { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--gap);
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px color-mix(in srgb, var(--accent) 15%, transparent);
}

.project-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.project-icon { font-size: 2rem; }

.project-links {
  display: flex;
  gap: 0.75rem;
}

.project-links a {
  color: var(--muted);
  transition: color var(--transition);
  display: flex;
}
.project-links a:hover { color: var(--accent); }
.project-links svg { width: 20px; height: 20px; }

.project-card h3 { font-size: 1.15rem; font-weight: 600; }

.project-card p { color: var(--muted); font-size: 0.9rem; flex: 1; }

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tags span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}

/* ── Contact ─────────────────────────────────────────────── */
.contact-inner {
  max-width: 640px;
  margin-inline: auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 540px) {
  .form-row { grid-template-columns: 1fr; }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  outline: none;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

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

.form-status {
  font-size: 0.9rem;
  color: var(--accent);
  text-align: center;
  min-height: 1.2em;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.contact-link:hover { color: var(--accent); }
.contact-link svg { width: 18px; height: 18px; }

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

/* ── Scroll reveal ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}