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

:root {
  --bg: #ffffff;
  --surface: #f7f7f7;
  --border: #e8e8e8;
  --text: #111111;
  --text-muted: #666666;
  --accent: #111111;
  --radius: 8px;
  --max-w: 1000px;
  --nav-h: 60px;
}

html { scroll-behavior: smooth; }

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, #667eea, #f64f59, #f9a825, #11998e);
  background-size: 300% 300%;
  animation: gradientShift 10s ease infinite;
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

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

/* ── Nav ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.3);
  z-index: 100;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
}

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

nav ul a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.15s;
}

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

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s, background 0.15s;
}

.btn-primary {
  background: var(--text);
  color: #fff;
}
.btn-primary:hover { opacity: 0.8; }

.btn-outline {
  border: 1.5px solid var(--border);
  color: var(--text-muted);
}
.btn-outline:hover { border-color: var(--text); color: var(--text); }

/* ── Shared ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
}

section {
  padding: 6rem 0;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

.hero-tag {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.4rem;
}

.hero-role {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-bio {
  max-width: 520px;
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

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

/* ── About Me ── */
.about-section { background: rgba(255,255,255,0.15); backdrop-filter: blur(4px); }

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-bio {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.75;
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-detail-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.4);
}

.about-detail-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.about-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.about-detail-item > span:last-child {
  font-size: 0.95rem;
  font-weight: 500;
}

@media (max-width: 700px) {
  .about-inner { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* ── Projects ── */
#projects { background: rgba(255,255,255,0.25); backdrop-filter: blur(4px); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: box-shadow 0.2s;
}

.card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.07); }

.card-header {
  font-weight: 700;
  font-size: 1.05rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  flex: 1;
}

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

.tag {
  font-size: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  color: var(--text-muted);
}

.card-links {
  display: flex;
  gap: 1.2rem;
}

.link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.link:hover { opacity: 0.6; }

/* ── Skills ── */
.skills-groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 2.5rem;
}

.skills-group h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.skills-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.skills-group li {
  font-size: 0.95rem;
  position: relative;
  padding-left: 1rem;
}

.skills-group li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* ── Contact ── */
#contact { background: rgba(255,255,255,0.25); backdrop-filter: blur(4px); }

.contact-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.contact-sub {
  color: var(--text-muted);
  max-width: 400px;
  font-size: 1rem;
}

.social-links {
  display: flex;
  gap: 1.5rem;
}

.social-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.social-links a:hover { color: var(--text); }

/* ── Footer ── */
footer {
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  nav ul { gap: 1.2rem; }
  .hero h1 { font-size: 2.5rem; }
}