/* ── Design tokens (matches snifox.com) ────────────────────────────────── */
:root {
  --bg:          #f4f6f9;
  --surface:     #ffffff;
  --surface-2:   #f8fafc;
  --border:      #e2e8f0;
  --text:        #0f172a;
  --text-2:      #64748b;
  --text-3:      #94a3b8;
  --nav-bg:      rgba(255,255,255,.88);
  --green:       #16884a;
  --green-dk:    #0a5c32;
  --green-light: #dcfce7;
  --green-glow:  rgba(22,136,74,.14);
  --shadow-sm:   0 1px 2px rgba(0,0,0,.05);
  --shadow:      0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.07);
  --shadow-lg:   0 4px 8px rgba(0,0,0,.07), 0 12px 32px rgba(0,0,0,.11);
  --radius:      16px;
  --t:           .25s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --bg:          #0b0f19;
  --surface:     #131929;
  --surface-2:   #1a2133;
  --border:      #232d42;
  --text:        #e2e8f0;
  --text-2:      #8896b3;
  --text-3:      #4a5568;
  --nav-bg:      rgba(13,20,38,.9);
  --green:       #34d399;
  --green-dk:    #6ee7b7;
  --green-light: #052e16;
  --green-glow:  rgba(52,211,153,.13);
  --shadow-sm:   0 1px 2px rgba(0,0,0,.3);
  --shadow:      0 1px 3px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:   0 4px 8px rgba(0,0,0,.4), 0 12px 32px rgba(0,0,0,.6);
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: background var(--t), color var(--t);
}

/* ── Navbar ─────────────────────────────────────────────────────────────── */
nav {
  position: sticky; top: 0; z-index: 100;
  width: 100%;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  transition: background var(--t), border-color var(--t);
}

.nav-brand {
  display: flex; align-items: center; gap: .5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 800; font-size: 1.05rem; letter-spacing: -.03em;
}

.brand-mark {
  width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dk) 100%);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem; flex-shrink: 0;
  box-shadow: 0 2px 8px var(--green-glow);
}
.brand-mark.sm { width: 24px; height: 24px; font-size: .75rem; border-radius: 6px; }

.nav-right {
  display: flex; align-items: center; gap: .75rem;
}

.nav-sep  { color: var(--text-3); font-weight: 400; }
.nav-page { color: var(--text-2); font-weight: 600; font-size: .95rem; }

.nav-link {
  font-size: .85rem; font-weight: 500; color: var(--text-2);
  text-decoration: none;
  transition: color var(--t);
}
.nav-link:hover { color: var(--text); }

.theme-btn {
  width: 36px; height: 36px;
  border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); cursor: pointer; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--t), border-color var(--t), transform .15s;
}
.theme-btn:hover { transform: scale(1.08); }

/* ── Main layout ─────────────────────────────────────────────────────────── */
main {
  width: 100%; max-width: 860px;
  padding: 2.5rem 1.25rem 4rem;
  display: flex; flex-direction: column; gap: 3rem;
  flex: 1;
}

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 1rem; }

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800; letter-spacing: -.04em;
  line-height: 1.1;
}

.hero-sub {
  font-size: 1.1rem; color: var(--text-2); line-height: 1.6;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--green-light); color: var(--green);
  border: 1px solid color-mix(in srgb, var(--green) 25%, transparent);
  padding: .35rem .85rem; border-radius: 99px;
  font-size: .85rem; font-weight: 600;
}

/* ── Converter section ───────────────────────────────────────────────────── */
.converter {
  display: flex; flex-direction: column; gap: 1.25rem;
}

.step-label {
  font-size: .8rem; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-3);
  margin-bottom: -.25rem;
}

/* ── Conversion cards ────────────────────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .75rem;
}

@media (max-width: 580px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 360px) {
  .cards-grid { grid-template-columns: 1fr; }
}

.conv-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1rem;
  cursor: pointer; text-align: left;
  display: flex; flex-direction: column; gap: .5rem;
  transition: border-color var(--t), box-shadow var(--t), transform .15s;
  box-shadow: var(--shadow-sm);
}

.conv-card:hover {
  border-color: var(--green);
  box-shadow: var(--shadow), 0 0 0 3px var(--green-glow);
  transform: translateY(-1px);
}

.conv-card.selected {
  border-color: var(--green);
  box-shadow: var(--shadow-lg), 0 0 0 4px var(--green-glow);
  background: color-mix(in srgb, var(--green) 5%, var(--surface));
}

.card-icons {
  display: flex; align-items: center; gap: .4rem;
  flex-wrap: wrap;
}

.fmt-badge {
  font-size: .65rem; font-weight: 700; letter-spacing: .04em;
  padding: .2rem .45rem; border-radius: 5px;
  flex-shrink: 0;
}
.fmt-red    { background: #fee2e2; color: #b91c1c; }
.fmt-blue   { background: #dbeafe; color: #1d4ed8; }
.fmt-green  { background: #dcfce7; color: #15803d; }
.fmt-purple { background: #ede9fe; color: #6d28d9; }
.fmt-orange { background: #ffedd5; color: #c2410c; }

[data-theme="dark"] .fmt-red    { background: #450a0a; color: #fca5a5; }
[data-theme="dark"] .fmt-blue   { background: #1e3a5f; color: #93c5fd; }
[data-theme="dark"] .fmt-green  { background: #052e16; color: #6ee7b7; }
[data-theme="dark"] .fmt-purple { background: #2e1065; color: #c4b5fd; }
[data-theme="dark"] .fmt-orange { background: #431407; color: #fdba74; }

.arrow-icon {
  width: 16px; height: 16px;
  color: var(--text-3); flex-shrink: 0;
}

.card-title {
  font-size: .95rem; font-weight: 700; letter-spacing: -.01em;
  color: var(--text);
}

.card-desc {
  font-size: .78rem; color: var(--text-2); line-height: 1.4;
}

/* ── Upload zone ─────────────────────────────────────────────────────────── */
.upload-section {
  display: flex; flex-direction: column; gap: 1rem;
  animation: slideDown .25s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.accept-hint {
  font-size: .75rem; font-weight: 400; letter-spacing: 0;
  text-transform: none; color: var(--green);
}

.drop-zone {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  display: flex; flex-direction: column; align-items: center;
  gap: .6rem; text-align: center; cursor: pointer;
  transition: border-color var(--t), background var(--t);
  outline: none;
}

.drop-zone:hover, .drop-zone:focus,
.drop-zone.drag-over {
  border-color: var(--green);
  background: color-mix(in srgb, var(--green) 4%, var(--surface));
}

.drop-icon {
  width: 48px; height: 48px; color: var(--green); margin-bottom: .25rem;
}

.drop-text { font-size: 1rem; font-weight: 600; color: var(--text); }
.drop-sub  { font-size: .85rem; color: var(--text-2); }
.size-limit { font-size: .75rem; color: var(--text-3); }

.file-label {
  color: var(--green); font-weight: 600; cursor: pointer;
  text-decoration: underline; text-underline-offset: 2px;
}

.file-info {
  display: flex; align-items: center; gap: .5rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px; padding: .5rem .75rem;
  font-size: .85rem; color: var(--text);
  max-width: 100%; width: 100%;
  margin-top: .25rem;
}

.file-name {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-weight: 500;
}
.file-size { color: var(--text-2); flex-shrink: 0; }

.remove-file {
  background: none; border: none; cursor: pointer;
  color: var(--text-3); font-size: .9rem; padding: 0 .2rem;
  flex-shrink: 0; line-height: 1;
  transition: color var(--t);
}
.remove-file:hover { color: #dc2626; }

/* ── Convert button ──────────────────────────────────────────────────────── */
.convert-btn {
  width: 100%; padding: .9rem;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dk) 100%);
  color: #fff; border: none; border-radius: 12px;
  font-size: 1rem; font-weight: 700; letter-spacing: -.01em;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: .6rem;
  box-shadow: 0 2px 12px var(--green-glow);
  transition: opacity var(--t), transform .15s, box-shadow var(--t);
}
.convert-btn:disabled {
  opacity: .45; cursor: not-allowed; box-shadow: none; transform: none;
}
.convert-btn:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--green-glow);
}
.convert-btn:not(:disabled):active { transform: translateY(0); }

.btn-spinner {
  width: 18px; height: 18px; flex-shrink: 0;
  border-radius: 50%;
  border: 2.5px solid rgba(255,255,255,.35);
  border-top-color: #fff;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.privacy-note {
  font-size: .8rem; color: var(--text-2); text-align: center;
}

.error-msg {
  background: #fee2e2; color: #b91c1c;
  border: 1px solid #fecaca; border-radius: 10px;
  padding: .75rem 1rem; font-size: .875rem; text-align: center;
}
[data-theme="dark"] .error-msg {
  background: #450a0a; color: #fca5a5; border-color: #7f1d1d;
}

/* ── Features ────────────────────────────────────────────────────────────── */
.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .75rem;
}
@media (max-width: 600px) {
  .features { grid-template-columns: repeat(2, 1fr); }
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1rem;
  display: flex; flex-direction: column; gap: .4rem;
  box-shadow: var(--shadow-sm);
}

.feature-icon { font-size: 1.4rem; }
.feature-title { font-size: .9rem; font-weight: 700; color: var(--text); }
.feature-desc  { font-size: .78rem; color: var(--text-2); line-height: 1.4; }

/* ── FAQ ─────────────────────────────────────────────────────────────────── */
.section-title {
  font-size: 1.4rem; font-weight: 800; letter-spacing: -.03em;
  margin-bottom: 1rem; color: var(--text);
}

.faq-section { display: flex; flex-direction: column; }

.faq-list { display: flex; flex-direction: column; gap: .5rem; }

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--t);
}
.faq-item[open] { box-shadow: var(--shadow); }

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600; font-size: .95rem;
  cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--text);
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.25rem; font-weight: 400;
  color: var(--text-3);
  flex-shrink: 0;
  transition: transform var(--t);
}
.faq-item[open] summary::after {
  content: '−';
}

.faq-item p {
  padding: 0 1.25rem 1rem;
  font-size: .875rem; color: var(--text-2); line-height: 1.6;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
footer {
  width: 100%;
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 1.5rem 2rem;
  transition: background var(--t), border-color var(--t);
}

.footer-inner {
  max-width: 860px; margin: 0 auto;
  display: flex; align-items: center; gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex; align-items: center; gap: .4rem;
  text-decoration: none; color: var(--text);
  font-weight: 800; font-size: .9rem;
}

.footer-links {
  display: flex; gap: 1.25rem; flex-wrap: wrap;
}
.footer-links a {
  color: var(--text-2); font-size: .85rem; text-decoration: none;
  transition: color var(--t);
}
.footer-links a:hover { color: var(--text); }

.footer-copy {
  margin-left: auto; font-size: .8rem; color: var(--text-3);
}

/* ── Cookie banner ───────────────────────────────────────────────────────── */
.cookie-banner {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex; align-items: center; gap: 1.5rem;
  flex-wrap: wrap;
  box-shadow: 0 -4px 24px rgba(0,0,0,.1);
}

.cookie-banner p { font-size: .875rem; color: var(--text-2); flex: 1; min-width: 200px; }
.cookie-banner a { color: var(--green); }

.cookie-actions { display: flex; gap: .75rem; flex-shrink: 0; }

.cookie-btn {
  padding: .45rem 1.1rem; border-radius: 8px;
  font-size: .85rem; font-weight: 600; cursor: pointer;
  transition: opacity var(--t), transform .15s;
}
.cookie-btn:hover { opacity: .85; transform: scale(1.03); }

.cookie-btn.outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-2);
}
.cookie-btn.solid {
  background: var(--green); color: #fff; border: none;
}