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

/* ── Design Tokens ───────────────────────── */
:root {
  /* Surface colours */
  --bg: #faf5ee;
  --bg-card: #ffffff;
  --surface-dark: #141414;

  /* Utility colours */
  --clr-accent: #f5c652;
  --clr-success: #4ade80;
  --clr-danger: #f87171;
  --clr-primary: #141414;

  /* Text */
  --text: #141414;
  --text-muted: #6b6560;
  --text-inv: #faf5ee;

  /* Borders & misc */
  --border: #e5ddd3;
  --border-strong: #cdc4b8;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.1);
  --transition: .25s cubic-bezier(.4,0,.2,1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
  --bg: #0f0f0f;
  --bg-card: #1c1c1c;
  --surface-dark: #faf5ee;
  --text: #ece5da;
  --text-muted: #8a837b;
  --text-inv: #0f0f0f;
  --border: #2a2a2a;
  --border-strong: #3a3a3a;
  --shadow: 0 2px 8px rgba(0,0,0,.25);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.45);
}

/* ── Base ────────────────────────────────── */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; }
button { font-family: inherit; }

/* ── Container ───────────────────────────── */
.container {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ═══════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 2px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-icon {
  font-size: 1.6rem;
}
.logo-text {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -.03em;
  text-transform: lowercase;
  color: var(--text);
}

.tagline {
  flex: 1;
  text-align: center;
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: .02em;
  text-transform: uppercase;
}

.theme-toggle {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-xs);
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 1.15rem;
  transition: border-color var(--transition), background var(--transition);
}
.theme-toggle:hover {
  border-color: var(--text);
}

/* ═══════════════════════════════════════════
   VIEWS
   ═══════════════════════════════════════════ */
.view {
  display: none;
  padding: 0 0 5rem;
}
.view.active {
  display: block;
  animation: viewIn .4s cubic-bezier(.4,0,.2,1);
}

@keyframes viewIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════════
   DROP ZONE
   ═══════════════════════════════════════════ */
.drop-zone {
  border: 3px dashed var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 3.5rem 1.5rem;
  text-align: center;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  cursor: pointer;
}
.drop-zone:hover {
  border-color: var(--text-muted);
}
.drop-zone.drag-over {
  border-color: var(--clr-accent);
  background: rgba(245,198,82,.08);
  transform: scale(1.01);
}
.drop-zone.has-files {
  display: none;
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .85rem;
}

.drop-zone-icon {
  width: 52px;
  height: 52px;
  color: var(--border-strong);
}

.drop-zone-text {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.02em;
}

.drop-zone-or {
  font-size: .82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: .06em;
}

/* ═══════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .6rem 1.3rem;
  border-radius: var(--radius-xs);
  font-size: .88rem;
  font-weight: 700;
  border: 2px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -.01em;
}
.btn:hover {
  border-color: var(--text);
  transform: translateY(-1px);
}
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--surface-dark);
  color: var(--text-inv);
  border-color: var(--surface-dark);
}
[data-theme="dark"] .btn-primary {
  color: var(--text-inv);
}
.btn-primary:hover {
  opacity: .88;
  border-color: var(--surface-dark);
}

.btn-success {
  background: #16a34a;
  color: #fff;
  border-color: #16a34a;
}
.btn-success:hover {
  background: #15803d;
  border-color: #15803d;
}

.btn-danger {
  background: var(--clr-danger);
  color: #fff;
  border-color: var(--clr-danger);
}
.btn-danger:hover {
  background: #ef4444;
  border-color: #ef4444;
}

.btn-sm { padding: .35rem .8rem; font-size: .8rem; border-radius: var(--radius-xs); }
.btn-lg { padding: .85rem 2.25rem; font-size: 1rem; border-radius: var(--radius-sm); }
.btn-active {
  background: var(--surface-dark);
  color: var(--text-inv);
  border-color: var(--surface-dark);
}
[data-theme="dark"] .btn-active {
  color: var(--text-inv);
}

.btn:disabled, .btn.disabled {
  opacity: .45;
  pointer-events: none;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-modifier);
  border: 1px solid var(--border);
  border-radius: 99px;
  color: var(--text-muted);
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
  padding: .4rem .85rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.back-btn:hover { 
  color: var(--text); 
  background: var(--bg-card);
  border-color: var(--text-muted);
}

/* ── Hidden utility ── */
.hidden { display: none !important; }

/* ═══════════════════════════════════════════
   INPUTS
   ═══════════════════════════════════════════ */
.input {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .85rem 1.25rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}
.input-full, .full-width { width: 100%; box-sizing: border-box; }
.input-lg { padding: 1rem 1.5rem; font-size: 1.25rem; }