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

:root {
  --color-bg: #ffffff;
  --color-fg: #111111;
  --color-muted: #888888;
  --color-border: #e0e0e0;
  --color-surface: #fafafa;
  --color-accent: #111111;
  --font: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --spacing: 1rem;
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-fg);
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1 { font-size: 2rem; font-weight: 300; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; font-weight: 400; }
.label { font-size: 0.6875rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--color-muted); }

/* Layout */
.container { max-width: 640px; margin: 0 auto; padding: 0 var(--spacing); }
.center { text-align: center; }
.divider { width: 2rem; height: 1px; background: var(--color-border); margin: 1.5rem auto; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  border: none;
  border-radius: 0;
  font-family: var(--font);
}
.btn-primary { background: var(--color-fg); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-fg); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Form */
.input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
  font-size: 0.9375rem;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-fg);
  outline: none;
}
.input:focus { border-color: var(--color-fg); }

/* Passcode gate */
.gate {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: 1rem;
  padding: var(--spacing);
}
.gate .label { margin-bottom: 0.5rem; }
.gate .input { max-width: 200px; text-align: center; font-size: 1.25rem; letter-spacing: 0.2em; }
.gate .error { font-size: 0.8125rem; color: #c00; min-height: 1.2em; }

/* Photo grid */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
}
@media (max-width: 480px) {
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
}
.photo-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

/* Screen (dark) */
body.screen-mode {
  --color-bg: #0a0a0a;
  --color-fg: #ffffff;
  --color-muted: #444444;
  --color-border: #1e1e1e;
  --color-surface: #111111;
}