/* ============================================
   FTTH Simulator — Design System
   Dark theme with teal/cyan accents
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Colors — Base */
  --bg-deep:          #060a14;
  --bg-primary:       #0a0e1a;
  --bg-surface:       #111627;
  --bg-elevated:      #181d30;
  --bg-hover:         #1e2440;
  --bg-active:        #252b4a;

  /* Colors — Borders */
  --border-subtle:    #1e2440;
  --border-default:   #2a3055;
  --border-strong:    #3a4070;

  /* Colors — Text */
  --text-primary:     #e8ecf4;
  --text-secondary:   #8892b0;
  --text-muted:       #5a6380;
  --text-inverse:     #0a0e1a;

  /* Colors — Accent */
  --accent-teal:      #00d4aa;
  --accent-teal-dim:  #00a886;
  --accent-teal-bg:   rgba(0, 212, 170, 0.08);
  --accent-teal-glow: rgba(0, 212, 170, 0.35);
  --accent-indigo:    #6366f1;
  --accent-indigo-dim:#4f46e5;
  --accent-indigo-bg: rgba(99, 102, 241, 0.08);
  --accent-cyan:      #22d3ee;
  --accent-blue:      #3b82f6;

  /* Colors — Semantic */
  --color-success:    #22c55e;
  --color-success-bg: rgba(34, 197, 94, 0.1);
  --color-warning:    #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.1);
  --color-danger:     #ef4444;
  --color-danger-bg:  rgba(239, 68, 68, 0.1);
  --color-info:       #3b82f6;
  --color-info-bg:    rgba(59, 130, 246, 0.1);

  /* Colors — Equipment Categories */
  --cat-active:       var(--accent-teal);
  --cat-active-bg:    var(--accent-teal-bg);
  --cat-passive:      var(--accent-indigo);
  --cat-passive-bg:   var(--accent-indigo-bg);

  /* Typography */
  --font-ui:          'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:        'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --text-xs:          0.6875rem;   /* 11px */
  --text-sm:          0.75rem;     /* 12px */
  --text-base:        0.8125rem;   /* 13px */
  --text-md:          0.875rem;    /* 14px */
  --text-lg:          1rem;        /* 16px */
  --text-xl:          1.25rem;     /* 20px */
  --text-2xl:         1.5rem;      /* 24px */
  --text-3xl:         2rem;        /* 32px */

  --leading-tight:    1.2;
  --leading-normal:   1.5;
  --leading-relaxed:  1.7;

  /* Spacing */
  --sp-1:  0.25rem;  /* 4px */
  --sp-2:  0.5rem;   /* 8px */
  --sp-3:  0.75rem;  /* 12px */
  --sp-4:  1rem;     /* 16px */
  --sp-5:  1.25rem;  /* 20px */
  --sp-6:  1.5rem;   /* 24px */
  --sp-8:  2rem;     /* 32px */
  --sp-10: 2.5rem;   /* 40px */
  --sp-12: 3rem;     /* 48px */

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:     0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg:     0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-xl:     0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-glow:   0 0 20px var(--accent-teal-glow);
  --shadow-glow-sm:0 0 10px var(--accent-teal-glow);

  /* Glassmorphism */
  --glass-bg:        rgba(17, 22, 39, 0.65);
  --glass-bg-strong: rgba(17, 22, 39, 0.85);
  --glass-blur:      12px;
  --glass-border:    rgba(255, 255, 255, 0.06);

  /* Transitions */
  --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:   120ms;
  --duration-normal: 200ms;
  --duration-slow:   350ms;

  /* Z-index */
  --z-canvas:    1;
  --z-node:      10;
  --z-node-drag: 50;
  --z-sidebar:   100;
  --z-tooltip:   500;
  --z-modal:     1000;
  --z-overlay:   900;

  /* Layout */
  --sidebar-width:     260px;
  --header-height:     56px;
  --statusbar-height:  52px;
}

/* ---------- Light Theme Overrides ---------- */
[data-theme="light"] {
  color-scheme: light;
  
  /* Colors — Base */
  --bg-deep:          #f1f5f9;
  --bg-primary:       #f8fafc;
  --bg-surface:       #ffffff;
  --bg-elevated:      #ffffff;
  --bg-hover:         #f1f5f9;
  --bg-active:        #e2e8f0;

  /* Colors — Borders */
  --border-subtle:    #f1f5f9;
  --border-default:   #cbd5e1;
  --border-strong:    #94a3b8;

  /* Colors — Text */
  --text-primary:     #0f172a;
  --text-secondary:   #475569;
  --text-muted:       #64748b;
  --text-inverse:     #ffffff;

  /* Glassmorphism overrides for Light Mode */
  --glass-bg:        rgba(255, 255, 255, 0.7);
  --glass-bg-strong: rgba(255, 255, 255, 0.95);
  --glass-border:    rgba(15, 23, 42, 0.08);
  
  /* Drop indicator for Light Mode */
  --accent-teal-bg:   rgba(0, 168, 134, 0.08);
}

[data-theme="light"] .canvas-container {
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
}


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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  color-scheme: dark;
}

body {
  font-family: var(--font-ui);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--bg-deep);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  outline: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--sp-2) var(--sp-3);
  outline: none;
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px var(--accent-teal-bg);
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238892b0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 28px;
  cursor: pointer;
}

select option {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

img, svg {
  display: block;
  max-width: 100%;
  shape-rendering: geometricPrecision;
  text-rendering: geometricPrecision;
}

ul, ol {
  list-style: none;
}

::selection {
  background: var(--accent-teal);
  color: var(--text-inverse);
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}


/* ---------- Utility Classes ---------- */
.font-mono { font-family: var(--font-mono); }
.text-xs   { font-size: var(--text-xs); }
.text-sm   { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md   { font-size: var(--text-md); }
.text-lg   { font-size: var(--text-lg); }
.text-xl   { font-size: var(--text-xl); }

.text-muted     { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent    { color: var(--accent-teal); }
.text-success   { color: var(--color-success); }
.text-warning   { color: var(--color-warning); }
.text-danger    { color: var(--color-danger); }

.fw-400 { font-weight: 400; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }


/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}

.glass-card-strong {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}


/* ---------- Button System ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  user-select: none;
}

.btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--accent-teal);
  color: var(--text-inverse);
}

.btn-primary:hover {
  background: var(--accent-teal-dim);
  box-shadow: var(--shadow-glow-sm);
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: var(--bg-active);
  border-color: var(--border-strong);
}

.btn-ghost {
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.btn-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
  padding: var(--sp-1) var(--sp-2);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-icon {
  padding: var(--sp-2);
  width: 32px;
  height: 32px;
}


/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 2px var(--sp-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
}

.badge-active {
  background: var(--cat-active-bg);
  color: var(--cat-active);
  border: 1px solid rgba(0, 212, 170, 0.15);
}

.badge-passive {
  background: var(--cat-passive-bg);
  color: var(--cat-passive);
  border: 1px solid rgba(99, 102, 241, 0.15);
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}


/* ---------- Status Indicator ---------- */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.success {
  background: var(--color-success);
  box-shadow: 0 0 6px var(--color-success);
}

.status-dot.warning {
  background: var(--color-warning);
  box-shadow: 0 0 6px var(--color-warning);
}

.status-dot.danger {
  background: var(--color-danger);
  box-shadow: 0 0 6px var(--color-danger);
}


/* ---------- Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInScale {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes bounceIn {
  0%   { opacity: 0; transform: scale(0.3); }
  50%  { opacity: 1; transform: scale(1.05); }
  70%  { transform: scale(0.97); }
  100% { transform: scale(1); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 4px var(--accent-teal-glow); }
  50%      { box-shadow: 0 0 12px var(--accent-teal-glow); }
}

@keyframes dashFlow {
  to { stroke-dashoffset: -20; }
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fade-in       { animation: fadeIn var(--duration-normal) var(--ease-out); }
.animate-fade-in-up    { animation: fadeInUp var(--duration-slow) var(--ease-out); }
.animate-fade-in-scale { animation: fadeInScale var(--duration-slow) var(--ease-spring); }
.animate-bounce-in     { animation: bounceIn 500ms var(--ease-spring); }