/* ══════════════════════════════════════════════
   BASE CSS — Splice Closure System Design System
   ══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Color Palette */
  --bg-base:      #b0b6be;
  --bg-surface:   #f9fafb;
  --bg-elevated:  #f3f4f6;
  --bg-card:      #ffffff;
  --bg-hover:     #e5e7eb;

  --border:       #d1d5db;
  --border-light: #9ca3af;

  --text-primary:   #111827;
  --text-secondary: #4b5563;
  --text-muted:     #6b7280;

  --accent:         #38BDF8;
  --accent-hover:   #0EA5E9;
  --accent-glow:    rgba(56, 189, 248, 0.15);

  --success:  #22C55E;
  --warning:  #F59E0B;
  --danger:   #EF4444;

  /* Fiber Colors (CSS variables for DOM usage) */
  --fiber-red:        #FF3333;
  --fiber-green:      #33CC33;
  --fiber-blue:       #3366FF;
  --fiber-yellow:     #FFD700;
  --fiber-white:      #F5F5F5;
  --fiber-grey:       #808080;
  --fiber-brown:      #8B4513;
  --fiber-violet:     #8B5CF6;
  --fiber-turquoise:  #00CED1;
  --fiber-black:      #222222;
  --fiber-orange:     #FF7F00;
  --fiber-pink:       #FF69B4;

  /* Left / Right side accent */
  --left-accent:  var(--accent);
  --right-accent: #34D399;

  /* Spacing */
  --radius:    8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow:    0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.15);
}

/* ── Reset ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Typography ────────────────────────────── */
h1, h2, h3, h4, h5 { font-weight: 600; line-height: 1.3; }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }
p { color: var(--text-secondary); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Scrollbar ─────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-surface); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }

/* ── Buttons ───────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: none;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}
.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--border-light);
}
.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.2);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.btn-sm { padding: 5px 10px; font-size: 0.8rem; }
.btn-lg { padding: 12px 24px; font-size: 1rem; }
.btn-icon { padding: 8px; border-radius: var(--radius); }

/* ── Cards ─────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.card:hover {
  border-color: var(--border-light);
  box-shadow: var(--shadow);
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.card-body { padding: 20px; }

/* ── Form elements ─────────────────────────── */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-control::placeholder { color: var(--text-muted); }
select.form-control { cursor: pointer; }

/* ── Input group ───────────────────────────── */
.input-group {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}
.input-group .form-group { flex: 1; margin-bottom: 0; }

/* ── Modal ─────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal-backdrop.show {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  transform: translateY(12px);
  transition: transform var(--transition);
}
.modal-backdrop.show .modal { transform: translateY(0); }
.modal-header {
  padding: 20px 24px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 1.1rem; }
.modal-body { padding: 24px; }
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* ── Nav / Header ──────────────────────────── */
.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-header .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  text-decoration: none;
}
.app-header .logo svg { color: var(--accent); }
.nav-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--text-muted);
  flex: 1;
}
.nav-breadcrumb a { color: var(--text-secondary); }
.nav-breadcrumb a:hover { color: var(--text-primary); }
.nav-breadcrumb .sep { color: var(--text-muted); }

/* ── Badge ─────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}
.badge-accent { background: var(--accent-glow); color: var(--accent); }
.badge-success { background: rgba(34,197,94,0.12); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.12); color: var(--warning); }

/* ── Toast / Alert ─────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 2000;
}
.toast {
  padding: 12px 18px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.2s ease;
  max-width: 320px;
}
.toast-success { background: #15532E; color: #86EFAC; }
.toast-error   { background: #7F1D1D; color: #FCA5A5; }
.toast-info    { background: #0C2340; color: #7DD3FC; }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ── Spinner ───────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Empty state ───────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.5; }
.empty-state h3 { color: var(--text-secondary); margin-bottom: 8px; }

/* ── Utility ───────────────────────────────── */
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.ml-auto { margin-left: auto; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.fw-600 { font-weight: 600; }
.mono { font-family: 'JetBrains Mono', monospace; }
.hidden { display: none !important; }