@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,600&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  --bg: #f6f0e8;
  --bg-accent: #e1efe2;
  --ink: #1f1d1b;
  --muted: #605a54;
  --subtle: #968c82;
  --accent: #0e6f60;
  --accent-dark: #0a5146;
  --accent-light: #18a089;
  --card: #ffffff;
  --card-inner: #faf7f2;
  --border: #e1d9cf;
  --border-soft: #ede6dd;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #fbe4cc 0%, transparent 60%),
    radial-gradient(900px 500px at 100% 0%, var(--bg-accent) 0%, transparent 55%),
    var(--bg);
  min-height: 100vh;
}

/* ─── Layout ───────────────────────────────────────────────────────────── */

.page {
  max-width: 780px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

/* ─── Header ───────────────────────────────────────────────────────────── */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
}

.brand-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.brand-name {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand-name em {
  font-style: normal;
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 10px;
  transition: background-color 0.15s, color 0.15s;
}

.nav a:hover {
  background: rgba(14, 111, 96, 0.08);
  color: var(--accent);
}

.nav a.nav-back {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.5);
}
.nav a.nav-back:hover {
  background: #fff;
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── Hero ─────────────────────────────────────────────────────────────── */

.hero {
  margin-bottom: 40px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.7rem;
  color: var(--subtle);
  margin: 0 0 10px;
  font-weight: 700;
}

.hero h1 {
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(2.3rem, 2.6vw + 1.4rem, 3.2rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 12px;
}

.hero h1 span {
  color: var(--accent);
}

.subtitle {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 540px;
  margin: 0;
  line-height: 1.65;
}

/* ─── Converter card ────────────────────────────────────────────────────── */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(31, 29, 27, 0.08);
  overflow: hidden;
}

/* ─── Steps ─────────────────────────────────────────────────────────────── */

.step {
  padding: 32px;
}

.step + .step {
  border-top: 1px solid var(--border-soft);
}

.step-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 24px;
}

.step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-title {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.25;
}

.step-desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 3px;
}

/* ─── Drop zone ─────────────────────────────────────────────────────────── */

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 44px 24px;
  text-align: center;
  cursor: pointer;
  background: var(--card-inner);
  transition: border-color 0.2s, background-color 0.2s;
  user-select: none;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(14, 111, 96, 0.03);
}

.drop-zone:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.drop-icon-wrap {
  margin-bottom: 14px;
  display: inline-flex;
  justify-content: center;
}

.drop-icon {
  width: 52px;
  height: 52px;
  transition: transform 0.2s ease;
}

.drop-zone:hover .drop-icon {
  transform: translateY(-2px);
}

.drop-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.drop-hint {
  font-size: 0.88rem;
  color: var(--muted);
}

.drop-hint span {
  color: var(--accent);
  font-weight: 600;
}

.drop-meta {
  margin-top: 12px;
  font-size: 0.78rem;
  color: var(--subtle);
}

/* ─── File list ─────────────────────────────────────────────────────────── */

.file-list {
  margin-top: 20px;
}

.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.btn-clear {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--muted);
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}

.btn-clear:hover {
  background: var(--border-soft);
  color: var(--ink);
}

.file-items {
  list-style: none;
  display: grid;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--card-inner);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  font-size: 0.88rem;
  transition: border-color 0.15s;
}

.file-item:hover {
  border-color: var(--border);
}

.file-item-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
}

.file-item-name {
  flex: 1;
  font-weight: 600;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-item-size {
  font-size: 0.8rem;
  color: var(--subtle);
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-remove {
  background: none;
  border: none;
  color: var(--subtle);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 0.85rem;
  font-family: inherit;
  border-radius: 6px;
  transition: background-color 0.15s, color 0.15s;
}

.btn-remove:hover {
  background: rgba(0, 0, 0, 0.05);
  color: #d32f2f;
}

/* ─── Format tabs ───────────────────────────────────────────────────────── */

.format-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

@media (max-width: 600px) {
  .format-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tab {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  line-height: 1.4;
}

.tab:hover {
  background: var(--card-inner);
  color: var(--ink);
  border-color: var(--border);
}

.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(14, 111, 96, 0.15);
}

/* ─── Format grid ───────────────────────────────────────────────────────── */

.format-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
  gap: 8px;
  min-height: 44px;
}

.format-btn {
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

.format-btn:hover {
  border-color: var(--accent);
  background: rgba(14, 111, 96, 0.04);
  color: var(--accent);
}

.format-btn.selected {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
  box-shadow: 0 4px 10px rgba(31, 29, 27, 0.15);
}

.format-empty {
  font-size: 0.88rem;
  color: var(--subtle);
  grid-column: 1 / -1;
  padding: 12px 0;
  font-weight: 500;
}

/* ─── Advanced settings ─────────────────────────────────────────────────── */

.advanced-settings {
  margin-top: 24px;
  border-top: 1px solid var(--border-soft);
  padding-top: 18px;
}

.settings-toggle {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.settings-toggle::-webkit-details-marker {
  display: none;
}

.settings-toggle:hover {
  color: var(--ink);
}

.settings-toggle .chevron {
  transition: transform 0.2s ease;
  color: var(--muted);
  flex-shrink: 0;
}

details[open] .settings-toggle .chevron {
  transform: rotate(180deg);
}

.settings-body {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 600px) {
  .settings-body {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

.setting-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}

.setting-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.setting-control input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
  height: 6px;
  border-radius: 3px;
}

.setting-val {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 28px;
  text-align: right;
}

.setting-select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.88rem;
  font-family: inherit;
  font-weight: 600;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
  transition: border-color 0.15s;
}

.setting-select:hover {
  border-color: var(--accent);
}

/* ─── Convert button area ───────────────────────────────────────────────── */

.step-action {
  padding: 28px 32px;
  border-top: 1px solid var(--border-soft);
  background: var(--card-inner);
  display: grid;
  gap: 16px;
}

.btn-convert {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(120deg, var(--accent), var(--accent-dark));
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 8px 20px rgba(14, 111, 96, 0.2);
  white-space: nowrap;
}

.btn-convert:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(14, 111, 96, 0.28);
}

.btn-convert:active:not(:disabled) {
  transform: translateY(0);
}

.btn-convert:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-arrow {
  font-size: 1.1rem;
  transition: transform 0.2s ease;
}

.btn-convert:hover:not(:disabled) .btn-arrow {
  transform: translateX(3px);
}

/* ─── Progress ──────────────────────────────────────────────────────────── */

.progress-wrap {
  width: 100%;
}

.progress-track {
  height: 8px;
  border-radius: 99px;
  background: #efe6da;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 99px;
  transition: width 180ms ease;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

/* ─── Result banner ─────────────────────────────────────────────────────── */

.result-banner {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.5;
}

.result-banner.success {
  background: rgba(14, 111, 96, 0.08);
  border: 1px solid rgba(14, 111, 96, 0.2);
  color: var(--accent-dark);
}

.result-banner.error {
  background: #fff4f4;
  border: 1px solid #f1c7c7;
  color: #7b1e1e;
}

/* ─── Features ──────────────────────────────────────────────────────────── */

.features {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (max-width: 600px) {
  .features {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.2s, box-shadow 0.2s;
  backdrop-filter: blur(8px);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(31, 29, 27, 0.06);
}

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 12px;
  display: block;
}

.feature-card h3 {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--ink);
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ─── Format reference ──────────────────────────────────────────────────── */

.formats-section {
  margin-top: 48px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
  border-left: 4px solid var(--accent);
  backdrop-filter: blur(8px);
}

.section-title {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--ink);
}

.formats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 32px;
}

@media (max-width: 600px) {
  .formats-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

.format-group h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.format-group p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ─── Footer ────────────────────────────────────────────────────────────── */

.site-footer {
  margin-top: 64px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--subtle);
  padding-bottom: 32px;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* ─── Responsive ────────────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .page {
    padding: 32px 16px 64px;
  }
  .site-header {
    margin-bottom: 32px;
  }
  .step {
    padding: 24px 20px;
  }
  .step-action {
    padding: 24px 20px;
  }
}