:root {
  --bg: #08090d;
  --bg2: #0f1118;
  --surface: #13151f;
  --surface2: #191c29;
  --border: #242838;
  --border2: #2e3348;
  --accent: #f0a500;
  --accent2: #e05c2a;
  --accentb: rgba(240, 165, 0, 0.15);
  --blue: #4d8fff;
  --teal: #2dcba0;
  --purple: #9d6ef5;
  --pink: #f06292;
  --text: #e4e6f0;
  --text2: #8a90aa;
  --text3: #50566e;
  --success: #2dcba0;
  --error: #ff5f6d;
  --r: 12px;
  --rs: 8px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}

body {
  font-family: "Instrument Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── Noise texture overlay ── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.025;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ── Layout ── */
.app {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 3.5rem 1rem 2.5rem;
  position: relative;
}
.hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(
    ellipse,
    rgba(240, 165, 0, 0.08) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1.5rem;
}
.logo-mark {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-name {
  font-family: "Syne", sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.logo-name span {
  color: var(--accent);
}

h1 {
  font-family: "Syne", sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
h1 em {
  font-style: normal;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  color: var(--text2);
  font-size: 1.05rem;
  font-weight: 300;
  max-width: 480px;
  margin: 0 auto 1.75rem;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 13px;
  border-radius: 100px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text2);
  font-weight: 500;
}
.trust-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 6px var(--teal);
}

/* ── Category Tabs ── */
.tabs {
  display: flex;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 6px;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  flex: 1;
  min-width: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 0.75rem 0.5rem;
  border-radius: var(--rs);
  border: none;
  background: transparent;
  color: var(--text2);
  font-family: "Instrument Sans", sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.18s;
  white-space: nowrap;
}
.tab-btn:hover {
  color: var(--text);
  background: var(--surface2);
}
.tab-btn.active {
  background: var(--bg);
  color: var(--accent);
  border: 1px solid var(--border2);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}
.tab-btn .tab-icon {
  font-size: 1.3rem;
  line-height: 1;
}
.tab-btn .tab-count {
  font-size: 0.7rem;
  color: var(--text3);
}
.tab-btn.active .tab-count {
  color: var(--text2);
}

/* ── Converter Grid ── */
.panel {
  display: none;
}
.panel.active {
  display: block;
}

.converter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

/* ── Converter Card ── */
.conv-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}
.conv-card:hover {
  border-color: var(--border2);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.conv-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 1rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
.conv-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.conv-title {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.2;
}
.conv-badge {
  font-size: 0.68rem;
  color: var(--text3);
  margin-top: 2px;
}

.conv-body {
  padding: 1rem 1.25rem 1.25rem;
}

/* ── Drop Zone ── */
.drop-zone {
  border: 2px dashed var(--border2);
  border-radius: var(--rs);
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition:
    border-color 0.2s,
    background 0.2s;
  position: relative;
}
.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(240, 165, 0, 0.04);
}
.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.dz-label {
  font-size: 0.82rem;
  color: var(--text2);
}
.dz-label strong {
  color: var(--accent);
  font-weight: 600;
}
.dz-hint {
  font-size: 0.72rem;
  color: var(--text3);
  margin-top: 3px;
}

/* ── File chip ── */
.file-chip {
  display: none;
  align-items: center;
  gap: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--rs);
  padding: 7px 10px;
  margin-top: 8px;
  font-size: 0.8rem;
}
.file-chip.show {
  display: flex;
}
.file-chip-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}
.file-chip-size {
  color: var(--text3);
  flex-shrink: 0;
}
.file-chip-rm {
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 2px;
}
.file-chip-rm:hover {
  color: var(--error);
}

/* ── Options row ── */
.options-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}
.opt-select,
.opt-input {
  flex: 1;
  min-width: 80px;
  padding: 7px 10px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--rs);
  color: var(--text);
  font-family: "Instrument Sans", sans-serif;
  font-size: 0.8rem;
  appearance: none;
  cursor: pointer;
}
.opt-select:focus,
.opt-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Multi-file list (merge) ── */
.multi-list {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 120px;
  overflow-y: auto;
}
.multi-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text2);
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 5px 8px;
  border-radius: 6px;
}
.multi-item span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Trim sliders ── */
.trim-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  align-items: center;
}
.trim-row label {
  font-size: 0.75rem;
  color: var(--text3);
  white-space: nowrap;
}
.trim-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}
.trim-val {
  font-size: 0.75rem;
  color: var(--text2);
  min-width: 32px;
  text-align: right;
}

/* ── Progress ── */
.progress-wrap {
  margin-top: 10px;
  display: none;
}
.progress-wrap.show {
  display: block;
}
.progress-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 5px;
  font-size: 0.75rem;
}
.progress-lbl {
  color: var(--text2);
}
.progress-pct {
  color: var(--accent);
  font-weight: 600;
}
.progress-track {
  height: 5px;
  background: var(--surface2);
  border-radius: 100px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 100px;
  transition: width 0.2s;
}

/* ── Action button ── */
.conv-btn {
  width: 100%;
  margin-top: 10px;
  padding: 0.75rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
  border-radius: var(--rs);
  font-family: "Syne", sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    opacity 0.2s,
    transform 0.1s,
    box-shadow 0.2s;
  box-shadow: 0 3px 16px rgba(240, 165, 0, 0.25);
  letter-spacing: 0.01em;
}
.conv-btn:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 5px 20px rgba(240, 165, 0, 0.35);
}
.conv-btn:active:not(:disabled) {
  transform: none;
}
.conv-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

/* ── Download / output area ── */
.output-area {
  margin-top: 10px;
}
.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 0.7rem;
  background: linear-gradient(135deg, var(--teal), #18a07a);
  color: #fff;
  border: none;
  border-radius: var(--rs);
  font-family: "Syne", sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  animation: fadeUp 0.3s ease both;
  box-shadow: 0 3px 16px rgba(45, 203, 160, 0.25);
}
.download-btn:hover {
  opacity: 0.9;
}

/* ── Image preview ── */
.img-preview {
  max-width: 100%;
  max-height: 160px;
  border-radius: var(--rs);
  margin-bottom: 8px;
  object-fit: contain;
  background: var(--bg2);
  display: block;
}

/* ── PDF preview ── */
.pdf-pages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 6px;
  margin-bottom: 8px;
}
.pdf-page-thumb {
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg2);
}
.pdf-page-thumb canvas {
  width: 100%;
  display: block;
}

/* ── Status msg ── */
.status-msg {
  font-size: 0.78rem;
  padding: 6px 10px;
  border-radius: var(--rs);
  margin-top: 8px;
  display: none;
}
.status-msg.show {
  display: block;
}
.status-msg.error {
  background: rgba(255, 95, 109, 0.1);
  color: var(--error);
  border: 1px solid rgba(255, 95, 109, 0.2);
}
.status-msg.info {
  background: rgba(77, 143, 255, 0.1);
  color: var(--blue);
  border: 1px solid rgba(77, 143, 255, 0.2);
}
.status-msg.ok {
  background: rgba(45, 203, 160, 0.1);
  color: var(--teal);
  border: 1px solid rgba(45, 203, 160, 0.2);
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 2.5rem 1rem 1rem;
  color: var(--text3);
  font-size: 0.78rem;
  line-height: 1.7;
}
footer strong {
  color: var(--text2);
}

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

/* ── Section label ── */
.section-label {
  font-family: "Syne", sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 0.75rem;
  padding-left: 2px;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .tabs {
    gap: 4px;
    padding: 4px;
  }
  .tab-btn {
    min-width: 80px;
    font-size: 0.75rem;
    padding: 0.6rem 0.4rem;
  }
  .converter-grid {
    grid-template-columns: 1fr;
  }
}