/* =========================
   Base + Theme Tokens
========================= */
:root {
  --bg: #0a0f1f;          /* deep navy */
  --surface: #141a33;     /* cards */
  --surface-2: #10162a;   /* alt sections */
  --text: #f1f4ff;        /* main text */
  --muted: #9aa4d6;       /* secondary text */
  --border: rgba(255, 255, 255, 0.15);

  --accent: #6c8cff;      /* main accent blue */
  --accent-2: #9b6cff;    /* purple highlight */

  --shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  --radius: 16px;
}

:root[data-theme="light"] {
  --bg: #f4f7ff;
  --surface: #ffffff;
  --surface-2: #eef2ff;
  --text: #0f1533;
  --muted: #4a5585;
  --border: rgba(15, 21, 51, 0.15);
  --accent: #4f6bff;
  --accent-2: #7b4fff;
  --shadow: 0 12px 30px rgba(15, 21, 51, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth; /* Smooth scrolling requirement */
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

/* Accessibility */
.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  background: var(--surface);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.skip-link:focus {
  left: 10px;
  z-index: 1000;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* =========================
   Header + Nav
========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 13, 18, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
:root[data-theme="light"] .site-header {
  background: rgba(246, 247, 251, 0.8);
}

.nav {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}
.brand-mark {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 10px;
}
.nav-links a:hover {
  background: rgba(124, 140, 255, 0.12);
  color: var(--text);
}

.theme-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 12px;
  padding: 8px 10px;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 12px;
  cursor: pointer;
}

/* =========================
   Hero
========================= */
.hero {
  padding: 56px 0 24px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 22px;
  align-items: start;
}

.pill {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(124, 140, 255, 0.12);
  color: var(--text);
  font-weight: 700;
  margin: 0 0 10px;
}

h1 {
  font-size: clamp(1.9rem, 3vw, 3rem);
  line-height: 1.15;
  margin: 0 0 12px;
}

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

.subtitle {
  color: var(--muted);
  margin: 0 0 18px;
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.avatar {
  height: 150px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  background: linear-gradient(135deg, rgba(124, 140, 255, 0.22), transparent);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 800;
  margin-bottom: 12px;
}
.avatar-text {
  font-size: 2.2rem;
  font-weight: 800;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.quick-facts {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

/* =========================
   Sections + Components
========================= */
.section {
  padding: 48px 0;
}
.section.alt {
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

h2 {
  margin: 0 0 12px;
  font-size: 1.6rem;
}
.lead {
  margin: 0;
  color: var(--muted);
  max-width: 80ch;
}
.muted {
  color: var(--muted);
  margin: 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.about-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 10px 0 0;
}
.tags li {
  border: 1px solid var(--border);
  background: rgba(124, 140, 255, 0.12);
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--text);
  font-weight: 700;
  font-size: 0.92rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  text-decoration: none;
  font-weight: 800;
}
.btn.primary {
  background: var(--accent);
  color: #0b0d12;
  border-color: transparent;
}
.btn.ghost {
  color: var(--text);
  background: transparent;
}
.btn:hover {
  transform: translateY(-1px);
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.project {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: grid;
  grid-template-rows: 160px auto;
}

.project-img {
  background: linear-gradient(135deg, rgba(124, 140, 255, 0.22), transparent);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 800;
  border-bottom: 1px solid var(--border);
}

.project-body {
  padding: 16px;
}
.project-body p {
  color: var(--muted);
  margin-top: 6px;
}
.project-links {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}
.project-links a {
  color: var(--accent);
  font-weight: 800;
  text-decoration: none;
}
.project-links a:hover {
  text-decoration: underline;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 14px;
  align-items: start;
}
.form label {
  display: block;
  margin-bottom: 12px;
  font-weight: 700;
}
input,
textarea {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  outline: none;
}
input:focus,
textarea:focus {
  border-color: rgba(124, 140, 255, 0.6);
}

.error {
  display: block;
  color: #ff7a7a;
  min-height: 18px;
  font-weight: 700;
  margin-top: 4px;
}

.form-status {
  margin: 12px 0 0;
  color: var(--muted);
  font-weight: 700;
}

.contact-list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.back-to-top {
  color: var(--accent);
  text-decoration: none;
  font-weight: 800;
}

/* =========================
   Responsive Breakpoints
========================= */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: inline-block;
  }
  .nav-links {
    display: none;
    width: 100%;
    padding: 10px 0 2px;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    flex-wrap: wrap;
  }
}