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

/* ===== Light Theme (default) ===== */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --accent: #e74c3c;
  --accent-hover: #c0392b;
  --accent-glow: rgba(231, 76, 60, 0.35);
  --success: #27ae60;
  --success-hover: #219a52;
  --success-glow: rgba(39, 174, 96, 0.35);
  --error: #e74c3c;
  --error-bg: #fdecea;
  --success-bg: #eafaf1;
  --border: #e0e0e0;
  --shadow: rgba(0,0,0,0.08);
  --progress-bg: #e0e0e0;
  --progress-fill: #e74c3c;
  --btn-text: #ffffff;
  --tab-bg: transparent;
  --tab-active-bg: var(--accent);
  --tab-active-text: #ffffff;
  --tab-inactive-text: var(--text-muted);
  --tab-hover-bg: rgba(231, 76, 60, 0.1);
  --toggle-bg: transparent;
  --toggle-border: #d0d0d0;
  --toggle-color: #6b7280;
}

/* ===== Dark Theme (cold blue) ===== */
:root[data-theme="dark"] {
  --bg: #0c0e16;
  --surface: #141824;
  --text: #e2e8f0;
  --text-muted: #8b95a8;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-glow: rgba(96, 165, 250, 0.25);
  --success: #34d399;
  --success-hover: #6ee7b7;
  --success-glow: rgba(52, 211, 153, 0.25);
  --error: #f87171;
  --error-bg: #1e1418;
  --success-bg: #0f1e18;
  --border: #1e293b;
  --shadow: rgba(0,0,0,0.4);
  --progress-bg: #1e293b;
  --progress-fill: #60a5fa;
  --btn-text: #0f172a;
  --tab-bg: transparent;
  --tab-active-bg: var(--accent);
  --tab-active-text: #0f172a;
  --tab-inactive-text: var(--text-muted);
  --tab-hover-bg: rgba(96, 165, 250, 0.12);
  --toggle-bg: transparent;
  --toggle-border: #334155;
  --toggle-color: #94a3b8;
}

/* ===== Layout ===== */
html {
  font-size: 16px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color 0.3s, color 0.3s;
}

.container {
  text-align: center;
  width: 100%;
  max-width: 560px;
  padding: 2rem 1.5rem;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--toggle-border);
  background: var(--toggle-bg);
  color: var(--toggle-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s;
  z-index: 100;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-icon {
  width: 20px;
  height: 20px;
}

/* ===== Typography ===== */
h1 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

/* ===== Card ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 2rem;
  box-shadow: 0 4px 24px var(--shadow);
  min-height: 280px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15), 0 4px 24px var(--shadow);
}

/* ===== Mode description ===== */
.mode-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
  line-height: 1.5;
  min-height: 2.7em;
}

.mode-desc strong {
  color: var(--text);
  font-weight: 600;
}

/* ===== Tooltip ===== */
/* ===== Input Toggle ===== */
.input-toggle {
  display: flex;
  gap: 0;
  justify-content: center;
  margin-bottom: 1.2rem;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  overflow: hidden;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.toggle-btn {
  padding: 0.4rem 1.2rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn.active {
  background: var(--accent);
  color: var(--btn-text);
}

.toggle-btn:not(.active):hover {
  background: var(--tab-hover-bg);
  color: var(--accent);
}

/* ===== URL Input ===== */
.url-area {
  margin-bottom: 1rem;
}

.url-input {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  outline: none;
  transition: border-color 0.2s;
}

.url-input:focus {
  border-color: var(--accent);
}

.url-input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.url-hint {
  margin: 0.45rem 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  opacity: 0.75;
  text-align: center;
}

/* ===== Upload Area ===== */
.action-area {
  text-align: center;
  margin-bottom: 0.5rem;
}

.upload-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* ===== Button ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-width: 240px;
  padding: 0.9rem 2.2rem;
  border: none;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.25s, transform 0.15s, box-shadow 0.25s;
  color: var(--btn-text);
}

.btn:active {
  transform: scale(0.97);
}

.btn-upload {
  background: var(--accent);
}

.btn-upload:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-download {
  background: var(--success);
}

.btn-download:hover {
  background: var(--success-hover);
  box-shadow: 0 4px 16px var(--success-glow);
}

.btn-icon {
  width: 22px;
  height: 22px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ===== File name ===== */
.file-name {
  color: var(--text-muted);
  font-size: 0.9rem;
  min-height: 1.3em;
  word-break: break-all;
}

/* ===== Choose Another ===== */
.choose-another-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}

.choose-another-btn:hover {
  color: var(--accent);
}

/* ===== Progress Bar ===== */
.progress-container {
  margin-top: 1.5rem;
}

.progress-label {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.progress-bar-bg {
  width: 100%;
  height: 10px;
  background: var(--progress-bg);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--progress-fill);
  border-radius: 10px;
  transition: width 0.3s ease;
}

/* ===== Queue Info ===== */
.queue-info {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.3px;
}

/* ===== Cancel Button ===== */
.cancel-btn {
  margin-top: 0.8rem;
  padding: 0.4rem 1.2rem;
  background: none;
  border: 1.5px solid var(--error);
  border-radius: 50px;
  color: var(--error);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.cancel-btn:hover {
  background: var(--error);
  color: var(--btn-text);
}

/* ===== Sanitization Report ===== */
.report-container {
  margin-top: 1rem;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  text-align: left;
}

.report-title {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text);
  margin-bottom: 0.6rem;
}

.report-list {
  list-style: none;
  padding: 0;
  margin: 0 0 0.6rem 0;
}

.report-list li {
  padding: 0.35rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  line-height: 1.5;
}

.report-list li:last-child {
  border-bottom: none;
}

.report-list .report-icon {
  margin-right: 0.4rem;
}

/* ===== Expandable Metadata Details ===== */
.meta-toggle {
  display: inline-block;
  margin-top: 0.35rem;
  padding: 0;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}

.meta-toggle:hover {
  color: var(--accent-hover);
}

.meta-details {
  margin-top: 0.5rem;
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

.meta-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

.meta-table tr {
  border-bottom: 1px solid var(--border);
}

.meta-table tr:last-child {
  border-bottom: none;
}

.meta-key {
  padding: 0.3rem 0.6rem;
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
  vertical-align: top;
  width: 1%;
}

.meta-value {
  padding: 0.3rem 0.6rem;
  color: var(--text-muted);
  word-break: break-all;
}

@media (max-width: 500px) {
  .meta-table {
    font-size: 0.72rem;
  }

  .meta-key {
    white-space: normal;
    width: 35%;
    word-break: break-word;
  }

  .meta-key,
  .meta-value {
    padding: 0.25rem 0.4rem;
  }

  .meta-details {
    max-height: 220px;
  }
}

.report-summary {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.3rem;
}

.report-clean {
  color: var(--success);
}

/* ===== Metadata Export ===== */
.export-area {
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
}

.btn-export {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1.4rem;
  border: 1.5px solid var(--accent);
  border-radius: 50px;
  background: transparent;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-export:hover {
  background: var(--accent);
  color: var(--btn-text);
}

.btn-icon-sm {
  width: 16px;
  height: 16px;
}

.export-json-link {
  color: var(--text-muted);
  font-size: 0.78rem;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  transition: color 0.2s;
}

.export-json-link:hover {
  color: var(--accent);
}

/* ===== Messages ===== */
.error-msg {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: var(--error-bg);
  color: var(--error);
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
}

.success-msg {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: var(--success-bg);
  color: var(--success);
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
}

/* ===== Reset ===== */
.reset-btn {
  margin-top: 1.2rem;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.reset-btn:hover {
  color: var(--accent-hover);
}

/* ===== Footer ===== */
footer {
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer p + p {
  margin-top: 0.3rem;
}

/* ===== Privacy Link ===== */
.privacy-link {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}

.privacy-link:hover {
  color: var(--accent);
}

/* ===== SEO Content Section ===== */
.seo-content {
  margin-top: 2.5rem;
  text-align: left;
  padding: 0 0.5rem;
}

.formats-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  font-weight: 600;
}

.formats-link:hover {
  color: var(--accent-hover);
}

.formats-grid {
  padding: 0 1.2rem 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem 1.5rem;
}

.format-group strong {
  display: block;
  font-size: 0.82rem;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.format-group span {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
  word-break: break-word;
}

@media (max-width: 500px) {
  .formats-grid {
    grid-template-columns: 1fr;
  }
}

.info-panel {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 0.6rem;
  overflow: hidden;
  transition: border-color 0.2s;
}

.info-panel:hover {
  border-color: var(--accent);
}

.info-panel summary {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.85rem 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.info-panel summary::-webkit-details-marker {
  display: none;
}

.info-panel summary::after {
  content: "›";
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--text-muted);
  transition: transform 0.2s;
  margin-left: 0.5rem;
}

.info-panel[open] summary::after {
  transform: rotate(90deg);
}

.info-panel p,
.info-panel ul {
  padding: 0 1.2rem 1rem;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
}

.info-panel ul {
  list-style: none;
  padding-left: 1.2rem;
  padding-right: 1.2rem;
  padding-bottom: 1rem;
}

.info-panel li {
  padding: 0.2rem 0;
  padding-left: 1.2rem;
  position: relative;
}

.info-panel li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

/* ===== Screen Reader Only (accessibility) ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Utility ===== */
.hidden {
  display: none !important;
}