:root {
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #5b6270;
  --text-muted: #94a3b8;
  --accent: #4f46e5;
  --accent-light: #eef2ff;
  --accent-dark: #4338ca;
  --accent-glow: rgba(79, 70, 229, 0.25);
  --border: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 7px;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --font-mono: 'SF Mono','Cascadia Code','Consolas','Monaco',monospace;
  --font-sans: 'Inter','Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --danger-border: #fecaca;
  --success: #10b981;
  --success-light: #ecfdf5;
  --success-border: #a7f3d0;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --warning-border: #fde68a;
  --info: #3b82f6;
  --info-light: #eff6ff;
  --info-border: #bfdbfe;
  --safe-bottom: env(safe-area-inset-bottom, 16px);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  padding-bottom: var(--safe-bottom);
}

/* ---- Layout ---- */
.app-wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px 24px;
}

/* ---- Header ---- */
.app-header {
  text-align: center;
  padding: 28px 16px 10px;
}
.app-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 2px;
}
.logo-icon {
  width: 44px; height: 44px;
  background: var(--accent);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: #fff;
  box-shadow: 0 6px 20px var(--accent-glow);
}
.app-title {
  font-size: 1.6rem; font-weight: 700; letter-spacing: -0.6px;
  background: linear-gradient(135deg, #1a1a2e 0%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.app-subtitle {
  font-size: 0.82rem; color: var(--text-secondary); margin-top: 1px;
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  display: flex; gap: 6px; align-items: center; flex-wrap: wrap;
  padding: 8px 0; font-size: 0.78rem; color: var(--text-secondary);
}
.breadcrumb a {
  color: var(--accent); text-decoration: none; font-weight: 600;
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--text-muted); }

/* ---- Cards ---- */
.card {
  background: var(--card-bg); border-radius: var(--radius);
  padding: 24px 28px; box-shadow: var(--shadow-lg);
  border: 1px solid var(--border); margin-bottom: 18px;
}

/* ---- Buttons ---- */
.btn {
  padding: 9px 18px; border-radius: 20px; border: none;
  font-weight: 600; font-size: 0.82rem; cursor: pointer;
  transition: var(--transition); display: inline-flex;
  align-items: center; gap: 5px; justify-content: center;
  min-height: 40px; background: #f1f5f9; color: var(--text);
  border: 1px solid var(--border);
  font-family: inherit; outline: none;
}
.btn:hover { background: #e2e8f0; transform: translateY(-1px); }
.btn:active { transform: scale(0.96); }
.btn-primary {
  background: var(--accent); color: #fff; border: none;
  box-shadow: 0 4px 12px var(--accent-glow);
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-outline {
  background: #fff; color: var(--accent); border: 2px solid var(--accent);
}
.btn-outline:hover { background: var(--accent-light); }
.btn-sm { padding: 5px 13px; font-size: 0.76rem; min-height: 34px; border-radius: 16px; }
.btn-xs { padding: 3px 10px; font-size: 0.7rem; min-height: 28px; border-radius: 12px; }
.btn-danger { background: var(--danger); color: #fff; border: none; }
.btn-block { width: 100%; display: flex; }
.btn-back {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 14px; border-radius: 8px;
  font-size: 0.82rem; font-weight: 600; cursor: pointer;
  background: var(--card-bg); border: 1px solid var(--border);
  color: var(--text-secondary); transition: var(--transition);
}
.btn-back:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-light); }

/* ---- Forms ---- */
.form-group { margin-bottom: 14px; }
.form-label {
  display: block; font-weight: 600; font-size: 0.78rem;
  margin-bottom: 4px; color: var(--text); letter-spacing: -0.1px;
}
.form-input, .form-select {
  width: 100%; padding: 10px 14px;
  border: 2px solid var(--border); border-radius: var(--radius-xs);
  font-size: 0.95rem; font-family: inherit;
  transition: var(--transition); background: #fafbfc;
  color: var(--text); outline: none;
  -webkit-appearance: none; appearance: none;
}
.form-input:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(79,70,229,0.07);
  background: #fff;
}
.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23555' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
  padding-right: 36px;
}
.input-row {
  display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap;
}
.input-row .form-group { flex: 1; min-width: 100px; margin-bottom: 0; }
textarea.form-input { min-height: 120px; resize: vertical; font-family: var(--font-mono); line-height: 1.5; }

/* ---- Result Boxes ---- */
.result-box {
  margin-top: 16px; padding: 16px 20px;
  border-radius: var(--radius-sm); font-weight: 700;
  font-size: 1rem; text-align: center;
  transition: var(--transition); display: none;
  position: relative;
}
.result-box.show { display: block; animation: popIn 0.45s cubic-bezier(0.175,0.885,0.32,1.275); }
.result-big { font-size: 2rem; font-weight: 800; letter-spacing: -1px; }
.result-primary { background: var(--info-light); color: #1e40af; border: 1px solid var(--info-border); }
.result-success { background: var(--success-light); color: #065f46; border: 1px solid var(--success-border); }
.result-warning { background: var(--warning-light); color: #92400e; border: 1px solid var(--warning-border); }
.result-danger  { background: var(--danger-light); color: #991b1b; border: 1px solid var(--danger-border); }

.result-box .copy-btn, .result-box .export-btn {
  position: absolute; top: 6px; z-index: 2;
  background: #fff; border: 1px solid var(--border);
  border-radius: 12px; padding: 2px 10px; font-size: 0.7rem;
  cursor: pointer; opacity: 0; transition: 0.2s;
}
.result-box:hover .copy-btn, .result-box:hover .export-btn { opacity: 1; }
.result-box .copy-btn { right: 8px; }
.result-box .export-btn { right: 70px; }

/* ---- Toast ---- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: #1a1a2e; color: #fff; padding: 10px 20px;
  border-radius: 20px; font-size: 0.82rem; font-weight: 600;
  z-index: 9999; pointer-events: none; opacity: 0;
  box-shadow: 0 8px 28px rgba(0,0,0,0.3);
  transition: opacity 0.3s;
}
.toast.show { opacity: 1; }

/* ---- Animations ---- */
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes popIn {
  0%   { transform: scale(0.82); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

/* ---- Home: Box Entry Grid ---- */
.box-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px; margin-top: 16px;
}
.box-card {
  display: block; text-decoration: none;
  background: var(--card-bg); border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow);
  border: 2px solid var(--border); transition: var(--transition);
  text-align: center; color: var(--text);
  cursor: pointer; position: relative; overflow: hidden;
}
.box-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 30px var(--accent-glow);
  transform: translateY(-4px);
}
.box-card .box-icon {
  font-size: 3rem; margin-bottom: 12px; display: block;
}
.box-card .box-name {
  font-size: 1.3rem; font-weight: 700; margin-bottom: 6px;
}
.box-card .box-desc {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5;
}
.box-card .box-badge {
  display: inline-block; margin-top: 10px; padding: 3px 10px;
  border-radius: 12px; font-size: 0.7rem; font-weight: 600;
  background: var(--accent-light); color: var(--accent);
}
.box-card.disabled {
  opacity: 0.5; cursor: not-allowed; pointer-events: none;
}

/* ---- Tool List Grid ---- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px; margin-top: 16px;
}
.tool-card {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--text);
  background: var(--card-bg); border-radius: var(--radius-sm);
  padding: 16px 20px; border: 1px solid var(--border);
  box-shadow: var(--shadow-sm); transition: var(--transition);
}
.tool-card:hover {
  border-color: var(--accent); box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.tool-card .tool-icon { font-size: 1.5rem; flex-shrink: 0; }
.tool-card .tool-info { flex:1; min-width: 0; }
.tool-card .tool-name { font-weight: 700; font-size: 0.95rem; }
.tool-card .tool-desc { font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; }

/* ---- Ad Slots ---- */
.ad-unit {
  background: #f9fafb; border: 2px dashed #d1d5db;
  border-radius: 12px; text-align: center; padding: 12px;
  margin: 0 0 16px 0; color: #9ca3af;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.5px;
  display: flex; align-items: center; justify-content: center;
  min-height: 90px; transition: var(--transition);
}
.ad-leaderboard { min-height: 90px; margin-bottom: 20px; }
.ad-footer { margin-top: 24px; min-height: 90px; }

/* ---- Tool Panel (for individual tool pages) ---- */
.tool-panel { animation: fadeSlideIn 0.35s ease; }
.panel-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 3px; }
.panel-desc { color: var(--text-secondary); font-size: 0.84rem; margin-bottom: 18px; }

/* ---- Misc Shared ---- */
table.data-table {
  width: 100%; border-collapse: collapse; font-size: 0.85rem;
  border: 1px solid var(--border); border-radius: var(--radius-xs);
  overflow: hidden;
}
table.data-table th, table.data-table td {
  padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border);
}
table.data-table th {
  background: #f8fafd; font-weight: 700; font-size: 0.75rem;
  color: var(--text-secondary); text-transform: uppercase;
}
table.data-table tr:last-child td { border-bottom: none; }

.code-font { font-family: var(--font-mono); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .card { padding: 16px 14px; }
  .box-grid { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; }
  .input-row { flex-direction: column; }
}