:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #e85d04;
  --accent-hover: #f77f00;
  --accent-dim: rgba(232, 93, 4, 0.15);
  --success: #3fb950;
  --success-dim: rgba(63, 185, 80, 0.15);
  --danger: #f85149;
  --danger-dim: rgba(248, 81, 73, 0.15);
  --warning: #d29922;
  --warning-dim: rgba(210, 153, 34, 0.15);
  --blue: #388bfd;
  --blue-dim: rgba(56, 139, 253, 0.15);
  --radius: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── NAVBAR ─── */
nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 0;
  height: 56px;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  text-decoration: none;
  margin-right: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-brand span { color: var(--text-primary); }
.nav-links {
  display: flex;
  gap: 0;
  list-style: none;
  flex: 1;
}
.nav-links a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}
.nav-links a.active { color: var(--accent); }

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  margin-left: auto;
}

/* ─── MAIN LAYOUT ─── */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ─── HERO ─── */
.hero {
  text-align: center;
  padding: 3.5rem 1rem 2.5rem;
}
.hero-badge {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 20px;
  padding: 0.3rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}
.hero h1 .accent { color: var(--accent); }
.hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 2rem;
}

/* ─── CARDS ─── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  display: block;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.card-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}
.card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.card p { color: var(--text-secondary); font-size: 0.9rem; }

/* ─── PAGE HEADER ─── */
.page-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
}
.page-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.page-header p { color: var(--text-secondary); margin-top: 0.3rem; }

/* ─── SECTIONS ─── */
.section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.section h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.8rem;
}

/* ─── FORMS ─── */
.form-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  min-width: 140px;
}
.form-group label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
}
input, select, textarea {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  padding: 0.55rem 0.75rem;
  font-size: 0.9rem;
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: inherit;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
select option { background: var(--bg-tertiary); }

/* ─── BUTTONS ─── */
button, .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.15s, transform 0.1s;
  text-decoration: none;
  white-space: nowrap;
  font-family: inherit;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger {
  background: var(--danger-dim);
  color: var(--danger);
  border: 1px solid transparent;
}
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8rem; }

/* ─── TABLES ─── */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  text-align: left;
  padding: 0.6rem 0.85rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
}
td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border);
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-tertiary); }

/* ─── BADGES ─── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-orange { background: var(--accent-dim); color: var(--accent); }
.badge-red    { background: var(--danger-dim); color: var(--danger); }
.badge-green  { background: var(--success-dim); color: var(--success); }
.badge-blue   { background: var(--blue-dim); color: var(--blue); }
.badge-gray   { background: var(--bg-tertiary); color: var(--text-secondary); }
.badge-yellow { background: var(--warning-dim); color: var(--warning); }

/* ─── ALERT BOXES ─── */
.alert {
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  border: 1px solid;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.alert-icon { font-size: 1.2rem; flex-shrink: 0; }
.alert-success { background: var(--success-dim); border-color: var(--success); color: var(--success); }
.alert-danger  { background: var(--danger-dim);  border-color: var(--danger);  color: var(--danger); }
.alert-warning { background: var(--warning-dim); border-color: var(--warning); color: var(--warning); }
.alert-info    { background: var(--blue-dim);    border-color: var(--blue);    color: var(--blue); }

/* ─── RESULT DISPLAY ─── */
.result-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin-top: 1.25rem;
}
.result-value {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  margin: 0.5rem 0;
}
.result-label { color: var(--text-secondary); font-size: 0.9rem; }

/* ─── TABS ─── */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem; }
.tab-btn {
  padding: 0.65rem 1.1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  font-weight: 500;
  transition: color 0.15s;
  margin-bottom: -1px;
  border-radius: 0;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ─── SEARCH ─── */
.search-wrap {
  position: relative;
  margin-bottom: 1.25rem;
}
.search-wrap input { padding-left: 2.5rem; font-size: 1rem; }
.search-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
}

/* ─── UN CLASS COLORS ─── */
.class-1  { background: #ff6b35; color: #fff; }
.class-2  { background: #339af0; color: #fff; }
.class-3  { background: #cc5de8; color: #fff; }
.class-4  { background: #f76707; color: #fff; }
.class-5  { background: #f59f00; color: #000; }
.class-6  { background: #51cf66; color: #000; }
.class-7  { background: #f03e3e; color: #fff; }
.class-8  { background: #20c997; color: #000; }
.class-9  { background: #74c0fc; color: #000; }

/* ─── EMPTY STATE ─── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}
.empty-state .empty-icon { font-size: 3rem; margin-bottom: 0.75rem; }

/* ─── FOOTER ─── */
footer {
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 3rem;
}
footer span { color: var(--accent); }

/* ─── RESPONSIVE ─── */
@media (max-width: 700px) {
  .nav-links { display: none; position: absolute; top: 56px; left: 0; right: 0; background: var(--bg-secondary); border-bottom: 1px solid var(--border); flex-direction: column; padding: 0.5rem; }
  .nav-links.open { display: flex; }
  .hamburger { display: block; }
  .form-row { flex-direction: column; }
  .form-group { min-width: 100%; }
  .card-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.8rem; }
}