:root {
  --bg: #0b0d17;
  --bg-secondary: #131629;
  --text: #f2f2f7;
  --text-muted: #b9bcd4;
  --accent: #8f9dff;
  --border: #262a45;
  --transition-speed: 0.6s;
}

/* Light theme overrides */
body.light {
  --bg: #f7f7fb;
  --bg-secondary: #ffffff;
  --text: #1b1c2b;
  --text-muted: #55576f;
  --accent: #5b63d3;
  --border: #e1e2ee;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  transition: background-color var(--transition-speed) ease,
              color var(--transition-speed) ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition-speed) ease;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  transition: color var(--transition-speed) ease;
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.toggle-label {
  color: var(--text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--transition-speed) ease;
}

#theme-toggle {
  position: relative;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background-color: var(--bg-secondary);
  color: var(--accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease,
              transform 0.3s ease;
}

#theme-toggle:hover {
  transform: scale(1.08) rotate(10deg);
}

#theme-toggle .icon {
  width: 22px;
  height: 22px;
  position: absolute;
  transition: opacity var(--transition-speed) ease,
              transform var(--transition-speed) ease;
}

/* Dark mode: show moon, hide sun */
#icon-sun { opacity: 0; transform: scale(0.5) rotate(-90deg); }
#icon-moon { opacity: 1; transform: scale(1) rotate(0deg); }

/* Light mode: show sun, hide moon */
body.light #icon-sun { opacity: 1; transform: scale(1) rotate(0deg); }
body.light #icon-moon { opacity: 0; transform: scale(0.5) rotate(90deg); }

main {
  flex: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  width: 100%;
}

.hero {
  text-align: center;
  padding: 2rem 0 1rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  color: var(--text);
  transition: color var(--transition-speed) ease;
  margin-bottom: 0.75rem;
}

.photo-frame {
  width: 220px;
  height: 220px;
  margin: 0 auto;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--accent);
  transition: border-color var(--transition-speed) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
}

.photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 1rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  transition: color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

/* Simple fade-in on load */
.fade-in {
  opacity: 0;
  transform: translateY(10px);
  animation: fadeInUp 0.8s ease forwards;
}
.fade-in:nth-of-type(1) { animation-delay: 0.1s; }
.fade-in:nth-of-type(2) { animation-delay: 0.25s; }
.fade-in:nth-of-type(3) { animation-delay: 0.4s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}