/* ---------- Reset ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* ---------- Theme tokens ---------- */
:root {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --text: #14141a;
  --text-muted: #63636d;
  --border: rgba(20, 20, 26, 0.08);
  --accent: #14141a;
  --accent-contrast: #ffffff;
  --card-bg: #ffffff;
  --shadow: 0 1px 2px rgba(20, 20, 26, 0.04), 0 8px 24px rgba(20, 20, 26, 0.06);
  --nav-bg: rgba(250, 250, 250, 0.75);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="dark"] {
  --bg: #0b0b0d;
  --bg-elevated: #131316;
  --text: #f2f2f4;
  --text-muted: #94949c;
  --border: rgba(255, 255, 255, 0.08);
  --accent: #ffffff;
  --accent-contrast: #0b0b0d;
  --card-bg: #17171b;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 30px rgba(0, 0, 0, 0.35);
  --nav-bg: rgba(11, 11, 13, 0.7);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
  overflow-x: hidden;
}

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

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 8px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 999px;
  transition: color 0.25s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 3px;
  height: 1.5px;
  background: var(--text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

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

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

.nav-link.active::after,
.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.toggle-track {
  display: flex;
  align-items: center;
  width: 48px;
  height: 26px;
  border-radius: 999px;
  background: var(--border);
  padding: 3px;
  transition: background 0.4s var(--ease);
}

.toggle-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateX(0);
  transition: transform 0.4s var(--ease), background 0.4s var(--ease);
  position: relative;
}

:root[data-theme="dark"] .toggle-thumb {
  transform: translateX(22px);
}

.toggle-thumb .icon {
  width: 12px;
  height: 12px;
  position: absolute;
  color: var(--accent-contrast);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.icon-moon {
  opacity: 0;
  transform: scale(0.5) rotate(-40deg);
}

:root[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: scale(0.5) rotate(40deg);
}

:root[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* Mobile menu button (hidden on desktop) */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-toggle span {
  width: 100%;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

/* ---------- Sections ---------- */
.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
}

.section-inner {
  max-width: 780px;
  width: 100%;
}

.eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}

/* Hero */
.hero {
  flex-direction: column;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 640px;
}

.hero-title {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 18px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary:hover {
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
}

.scroll-cue {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 34px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
}

.scroll-cue span {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  border-radius: 2px;
  background: var(--text-muted);
  animation: scrollCue 1.8s ease-in-out infinite;
}

@keyframes scrollCue {
  0% { opacity: 1; transform: translate(-50%, 0); }
  70% { opacity: 0; transform: translate(-50%, 12px); }
  100% { opacity: 0; transform: translate(-50%, 12px); }
}

/* About */
.about-text {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 48px;
}

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

.interest-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px 22px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.interest-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: transparent;
}

.interest-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  color: var(--text);
}

.interest-icon svg {
  width: 100%;
  height: 100%;
}

.interest-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.interest-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Contact */
.contact-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 24px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

.contact-card:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
  border-color: transparent;
}

.contact-icon {
  width: 42px;
  height: 42px;
  min-width: 42px;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}

.contact-icon svg {
  width: 20px;
  height: 20px;
}

.contact-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 3px;
}

.contact-card p {
  font-size: 1rem;
  font-weight: 500;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-link {
    padding: 12px 8px;
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle.open span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
  }

  .menu-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.open span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
  }

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