/* ============================================
   AutoAlg Tools — Shared Styles
   ============================================ */

:root {
  --bg: #f5f7fa;
  --bg-card: #ffffff;
  --bg-input: #f8f9fb;
  --text: #2c3e50;
  --text-secondary: #6b7c93;
  --border: #e2e8f0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-bg: #eff6ff;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.08);
  --radius: 10px;
  --radius-sm: 6px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, "Courier New", monospace;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --border: #334155;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-bg: #1e3a5f;
  --success: #34d399;
  --success-bg: #064e3b;
  --warning: #fbbf24;
  --warning-bg: #451a03;
  --danger: #f87171;
  --danger-bg: #450a0a;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.4);
}

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

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Top Nav ---- */
.topnav {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
  transition: background var(--transition), border-color var(--transition);
}

.topnav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}
.brand-logo { width: 24px; height: 24px; flex-shrink: 0; }

.topnav-brand:hover { text-decoration: none; }
.topnav-brand span { color: var(--accent); }

.topnav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  overflow-x: auto;
}

.topnav-links a {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all var(--transition);
}

.topnav-links a:hover,
.topnav-links a.active {
  background: var(--accent-bg);
  color: var(--accent);
  text-decoration: none;
}

.topnav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#themeToggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  line-height: 1;
}
#themeToggle:hover {
  background: var(--accent-bg);
  border-color: var(--accent);
  color: var(--accent);
}

.nav-lang {
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  background: none;
  text-decoration: none;
  transition: all var(--transition);
}
.nav-lang:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.nav-home {
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition);
}
.nav-home:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---- Main Content ---- */
.main-content {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.page-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* ---- Card ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: background var(--transition), border-color var(--transition);
}

.card + .card { margin-top: 1rem; }

.card-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
  line-height: 1.4;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.btn-success {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.btn-danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.btn-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* ---- Textarea & Input ---- */
.textarea, .input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  resize: vertical;
  transition: border-color var(--transition), background var(--transition);
  line-height: 1.6;
}
.textarea:focus, .input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
.textarea { min-height: 160px; }

.input-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.input-row label {
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
}

.input-row .input {
  flex: 1;
  min-width: 0;
}

select.input {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7c93' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

/* ---- Status Bar ---- */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  font-weight: 500;
}
.status-ok { background: var(--success-bg); color: var(--success); }
.status-err { background: var(--danger-bg); color: var(--danger); }
.status-warn { background: var(--warning-bg); color: var(--warning); }

/* ---- Tools Grid (homepage) ---- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: all var(--transition);
}
.tool-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.tool-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.tool-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.tool-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.tool-tags {
  margin-top: auto;
  padding-top: 0.75rem;
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  background: var(--accent-bg);
  color: var(--accent);
  font-weight: 500;
}

/* ---- Toast ---- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-size: 0.85rem;
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- Footer ---- */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  background: var(--bg-card);
  transition: all var(--transition);
}

.site-footer a {
  color: var(--text-secondary);
  margin: 0 0.5rem;
}
.site-footer a:hover { color: var(--accent); }

.beian {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3rem 1.2rem;
}

.gongan {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.gongan img { width: 14px; height: 14px; }

/* ---- Regex-specific ---- */
.match-highlight { background: #fef08a; color: #854d0e; padding: 1px 2px; border-radius: 2px; }
[data-theme="dark"] .match-highlight { background: #854d0e; color: #fef08a; }

.match-list {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.match-list li {
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--border);
}
.match-list li:last-child { border-bottom: none; }
.match-index {
  color: var(--text-secondary);
  font-size: 0.75rem;
  margin-right: 0.5rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .topnav { padding: 0 1rem; }
  .topnav-links { display: none; }
  .main-content { padding: 1.25rem 1rem; }
  .tools-grid { grid-template-columns: 1fr; }
}

/* ---- Hamburger Menu (mobile) ---- */
.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text);
  padding: 0.25rem;
}

@media (max-width: 768px) {
  .hamburger { display: block; }
  .topnav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.5rem;
    box-shadow: var(--shadow-lg);
  }
  .topnav-links.open { display: flex; }
  .topnav-links a { padding: 0.6rem 1rem; }
}

/* ---- Split Layout ---- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 768px) {
  .split { grid-template-columns: 1fr; }
}

/* ---- Flag Buttons (Regex) ---- */
.flag-group { gap: 0.35rem; }
.flag-btn {
  min-width: 36px;
  text-align: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
}
.flag-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---- Copy Button Feedback ---- */
.btn.copied {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
  pointer-events: none;
}
/* ---- Tab Buttons ---- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1rem;
}
.tab-btn {
  padding: 0.5rem 1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}