:root {
  --bg: #241611;
  --bg-soft: #2c1c15;
  --surface: #1a100c;
  --surface-2: #150c09;
  --border: #4a3226;
  --text: #f1e6dd;
  --text-dim: #baa08e;
  --accent: #e8875a;
  --accent-2: #d96b3c;
  --danger: #e0665a;
  --shadow: rgba(0, 0, 0, 0.45);
  --radius-lg: 16px;
  --radius-md: 10px;
  --font-size: 17px;

  --c-sc: #c1503a;
  --c-lc: #4f7a3d;
  --c-uc: #2f7fb0;
  --c-cc: #8a4fbf;
  --c-ac: #b8862f;
  --c-tc: #2f9e7d;
  --c-ic: #b03f7e;
}

:root[data-theme="light"] {
  --bg: #f4ece4;
  --bg-soft: #ffffff;
  --surface: #fffaf5;
  --surface-2: #ffffff;
  --border: #e0cdb9;
  --text: #2c1c15;
  --text-dim: #7a6252;
  --accent: #c1622f;
  --accent-2: #a94f21;
  --shadow: rgba(90, 60, 30, 0.15);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, var(--bg-soft), var(--bg) 70%);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, "Inter", Roboto, Helvetica, Arial, sans-serif;
  padding: 32px 16px 0;
  transition: background 0.3s ease, color 0.3s ease;
}

.app {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0;
  color: var(--text);
}

.app-header h1 a {
  color: inherit;
  text-decoration: none;
}

.app-header h1 a:hover {
  color: var(--accent);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease, border-color 0.2s ease;
}

.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.icon-btn:active {
  transform: translateY(0);
}

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

.icon-moon { display: block; }
.icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: block; }

.editor-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px var(--shadow);
  overflow: hidden;
}

#text-input {
  width: 100%;
  min-height: 320px;
  resize: vertical;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: var(--font-size);
  line-height: 1.6;
  padding: 24px;
  caret-color: var(--accent);
}

#text-input::placeholder {
  color: var(--text-dim);
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.toolbar-left {
  display: flex;
  gap: 8px;
}

.stats {
  display: flex;
  gap: 16px;
  color: var(--text-dim);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

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

.case-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.case-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
}

.case-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.case-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a0f0a;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 20px;
  padding: 0 4px;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
}

.case-btn[data-case="sentence"] .badge { background: var(--c-sc); }
.case-btn[data-case="lower"] .badge { background: var(--c-lc); }
.case-btn[data-case="upper"] .badge { background: var(--c-uc); }
.case-btn[data-case="capitalized"] .badge { background: var(--c-cc); }
.case-btn[data-case="alternating"] .badge { background: var(--c-ac); }
.case-btn[data-case="title"] .badge { background: var(--c-tc); }
.case-btn[data-case="inverse"] .badge { background: var(--c-ic); }

.settings-panel {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.settings-panel[hidden] {
  display: none;
}

.settings-panel-inner {
  width: min(360px, 90vw);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 20px 50px var(--shadow);
}

.settings-panel-inner h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  color: var(--text);
  font-size: 0.95rem;
}

.settings-row input[type="range"] {
  accent-color: var(--accent);
}

.settings-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.settings-close-btn {
  width: 100%;
  margin-top: 12px;
  padding: 10px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--accent);
  color: #1a0f0a;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}

.settings-close-btn:hover {
  background: var(--accent-2);
}

.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%, 20px);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 999px;
  box-shadow: 0 10px 25px var(--shadow);
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.content-wrapper {
  width: 100%;
  max-width: 800px;
  margin: 56px auto 0;
  padding: 0 16px;
  color: var(--text);
  line-height: 1.7;
}

.content-wrapper section {
  margin-bottom: 40px;
}

.content-wrapper h2 {
  font-size: 1.5rem;
  margin: 0 0 16px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.content-wrapper h3 {
  font-size: 1.1rem;
  margin: 20px 0 8px;
  color: var(--accent);
}

.content-wrapper p {
  margin: 0 0 14px;
  color: var(--text-dim);
}

.content-wrapper strong {
  color: var(--text);
}

.content-wrapper ul,
.content-wrapper ol {
  margin: 0 0 14px;
  padding-left: 22px;
  color: var(--text-dim);
}

.content-wrapper li {
  margin-bottom: 10px;
}

.content-wrapper li strong {
  color: var(--text);
}

#faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 10px;
}

#faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  list-style: none;
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::before {
  content: '+ ';
  color: var(--accent);
  font-weight: 700;
}

#faq details[open] summary::before {
  content: '- ';
}

#faq details p {
  margin: 10px 0 0;
}

.site-footer {
  margin-top: 56px;
  border-top: 1px solid var(--border);
  padding: 28px 16px 40px;
}

.site-footer-inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-copy {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.legal-page main {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px;
}

.legal-page .back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.legal-page .back-link:hover {
  text-decoration: underline;
}

.legal-page h1 {
  font-size: 1.8rem;
  margin: 0 0 8px;
}

.legal-page .updated {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin: 0 0 32px;
}

.legal-page h2 {
  font-size: 1.2rem;
  margin: 28px 0 10px;
  color: var(--text);
}

.legal-page p,
.legal-page li {
  color: var(--text-dim);
  line-height: 1.7;
}

.legal-page ul {
  padding-left: 22px;
}

.legal-page li {
  margin-bottom: 8px;
}

.legal-page strong {
  color: var(--text);
}

@media (max-width: 600px) {
  .app-header h1 {
    font-size: 1.25rem;
  }
  #text-input {
    min-height: 220px;
    padding: 16px;
  }
  .toolbar {
    justify-content: flex-start;
  }
  .case-btn {
    padding: 8px 12px;
    font-size: 0.85rem;
  }
  .content-wrapper {
    margin-top: 40px;
  }
  .content-wrapper h2 {
    font-size: 1.3rem;
  }
  .legal-page h1 {
    font-size: 1.5rem;
  }
}