/* ═══════════════════════════════════════════════════════
   FRaiNCalc — style.css
   Franchise Scenario Calculator
   Dark + Light theme with toggle
   ═══════════════════════════════════════════════════════ */

/* ── DARK THEME (default) ──────────────────────────────── */
:root,
[data-theme="dark"] {
  --bg-primary: #0a0e17;
  --bg-card: #131b2b;
  --bg-card-hover: #182234;
  --bg-input: #0d1320;
  --bg-header: rgba(10,14,23,0.92);
  --border: rgba(255,255,255,0.06);
  --border-focus: rgba(56,189,248,0.4);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --accent: #38bdf8;
  --accent-dim: rgba(56,189,248,0.1);
  --accent-glow: rgba(56,189,248,0.25);
  --green: #34d399;
  --green-dim: rgba(52,211,153,0.1);
  --red: #f87171;
  --red-dim: rgba(248,113,113,0.1);
  --yellow: #fbbf24;
  --orange: #fb923c;
  --slider-track: rgba(255,255,255,0.08);
  --slider-thumb-border: #131b2b;
  --bar-track: rgba(255,255,255,0.04);
  --hero-bg: linear-gradient(135deg, rgba(56,189,248,0.06), rgba(52,211,153,0.04));
  --hero-border: rgba(56,189,248,0.1);
  --mesh-a: rgba(56,189,248,0.04);
  --mesh-b: rgba(52,211,153,0.03);
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 180ms ease;
}

/* ── LIGHT THEME ───────────────────────────────────────── */
[data-theme="light"] {
  --bg-primary: #f5f7fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #f1f5f9;
  --bg-header: rgba(255,255,255,0.92);
  --border: rgba(0,0,0,0.08);
  --border-focus: rgba(14,116,144,0.4);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --accent: #0891b2;
  --accent-dim: rgba(8,145,178,0.08);
  --accent-glow: rgba(8,145,178,0.2);
  --green: #059669;
  --green-dim: rgba(5,150,105,0.08);
  --red: #dc2626;
  --red-dim: rgba(220,38,38,0.06);
  --yellow: #d97706;
  --orange: #ea580c;
  --slider-track: rgba(0,0,0,0.1);
  --slider-thumb-border: #ffffff;
  --bar-track: rgba(0,0,0,0.05);
  --hero-bg: linear-gradient(135deg, rgba(8,145,178,0.06), rgba(5,150,105,0.04));
  --hero-border: rgba(8,145,178,0.12);
  --mesh-a: rgba(8,145,178,0.03);
  --mesh-b: rgba(5,150,105,0.02);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

body::before {
  content: '';
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 70% 50% at 15% 25%, var(--mesh-a) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 75%, var(--mesh-b) 0%, transparent 60%);
  transition: background 0.3s ease;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* ── HEADER ────────────────────────────────────────────── */
.app-header {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: 60px;
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-brand { display: flex; align-items: center; gap: 14px; }

.header-logo {
  font-size: 20px; font-weight: 700; letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent), var(--green));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  cursor: default;
}

.header-sep { width: 1px; height: 22px; background: rgba(255,255,255,0.1); }
.header-sub { font-size: 12px; color: var(--text-tertiary); letter-spacing: 0.3px; }

.header-right { display: flex; align-items: center; gap: 10px; }

.header-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  font-size: 11px; font-weight: 500;
  background: var(--accent-dim); color: var(--accent);
  border: 1px solid var(--accent-glow);
  text-decoration: none; transition: all var(--transition);
}
.header-badge:hover { background: var(--accent-glow); border-color: var(--accent); }

/* ── THEME TOGGLE ──────────────────────────────────────── */
.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer; font-size: 16px;
  transition: all var(--transition);
  flex-shrink: 0; line-height: 1;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── LAYOUT ────────────────────────────────────────────── */
.app-container { max-width: 1200px; margin: 0 auto; padding: 24px 28px 80px; }

/* ── NAV TABS ──────────────────────────────────────────── */
.calc-nav {
  display: flex; gap: 6px; flex-wrap: wrap;
  margin-bottom: 24px; padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.calc-nav-btn {
  padding: 7px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: transparent;
  color: var(--text-secondary); cursor: pointer;
  font-size: 12px; font-weight: 500; font-family: var(--font);
  transition: all var(--transition); white-space: nowrap;
}
.calc-nav-btn:hover { border-color: var(--accent-glow); color: var(--text-primary); }
.calc-nav-btn.active {
  background: var(--accent-dim); border-color: var(--accent-glow); color: var(--accent);
}

/* ── CALCULATOR LAYOUT ─────────────────────────────────── */
.calc-title {
  font-size: 22px; font-weight: 700; letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.calc-desc {
  font-size: 13px; color: var(--text-tertiary); margin-bottom: 24px;
  max-width: 600px;
}

.calc-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 20px; align-items: start;
}

/* ── INPUT PANEL ───────────────────────────────────────── */
.input-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.panel-label {
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.7px;
  color: var(--text-tertiary); margin-bottom: 16px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
}

.input-group { margin-bottom: 18px; }

.input-label {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 6px;
}

.input-label-text { font-size: 13px; color: var(--text-secondary); }

.input-label-value {
  font-size: 14px; font-weight: 600; color: var(--accent);
  font-family: var(--mono); font-feature-settings: 'tnum';
}

.input-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 2px;
  background: var(--slider-track); outline: none;
  cursor: pointer;
}

.input-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--slider-thumb-border);
  box-shadow: 0 0 8px rgba(56,189,248,0.4);
  cursor: pointer; transition: transform 0.1s;
}
.input-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

.input-slider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--slider-thumb-border);
  box-shadow: 0 0 8px rgba(56,189,248,0.4);
  cursor: pointer;
}

.input-number {
  width: 100%; padding: 8px 12px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--mono); font-size: 14px; outline: none;
  transition: border-color var(--transition);
}
.input-number:focus { border-color: var(--border-focus); }

.input-select {
  width: 100%; padding: 8px 12px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font); font-size: 13px; outline: none;
  cursor: pointer; transition: border-color var(--transition);
}
.input-select:focus { border-color: var(--border-focus); }
.input-select option { background: var(--bg-card); color: var(--text-primary); }

.input-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}

/* ── OUTPUT PANEL ──────────────────────────────────────── */
.output-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.output-hero {
  text-align: center; padding: 24px 16px;
  margin-bottom: 20px;
  background: var(--hero-bg);
  border: 1px solid var(--hero-border);
  border-radius: var(--radius-sm);
}

.output-hero-label {
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--text-tertiary); margin-bottom: 6px;
}

.output-hero-value {
  font-size: 38px; font-weight: 800; letter-spacing: -2px;
  font-family: var(--mono); font-feature-settings: 'tnum';
}

.output-hero-sub {
  font-size: 12px; color: var(--text-tertiary); margin-top: 4px;
}

.output-positive { color: var(--green); }
.output-negative { color: var(--red); }
.output-neutral { color: var(--accent); }
.output-warn { color: var(--yellow); }

.output-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.output-row:last-child { border-bottom: none; }

.output-row-label { color: var(--text-secondary); }

.output-row-value {
  font-weight: 600; font-family: var(--mono);
  font-feature-settings: 'tnum'; font-size: 14px;
}

.output-divider {
  height: 1px; background: var(--border);
  margin: 16px 0;
}

.output-section-label {
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.6px;
  color: var(--text-tertiary); margin: 16px 0 8px;
}

/* ── BAR VISUALIZATION ─────────────────────────────────── */
.bar-compare {
  display: flex; flex-direction: column; gap: 8px;
  margin: 12px 0;
}

.bar-row { display: flex; align-items: center; gap: 10px; }
.bar-label { font-size: 11px; color: var(--text-tertiary); min-width: 60px; text-align: right; }

.bar-track {
  flex: 1; height: 8px; border-radius: 4px;
  background: var(--bar-track); overflow: hidden;
}

.bar-fill {
  height: 100%; border-radius: 4px;
  transition: width 0.4s ease;
}

.bar-value {
  font-size: 12px; font-weight: 600;
  font-family: var(--mono); min-width: 50px;
}

/* ── ALERT BOX ─────────────────────────────────────────── */
.calc-alert {
  padding: 10px 14px; border-radius: var(--radius-sm);
  font-size: 12px; margin-top: 12px;
  display: flex; align-items: center; gap: 8px;
}

.calc-alert-green { background: var(--green-dim); color: var(--green); border: 1px solid rgba(52,211,153,0.15); }
.calc-alert-red { background: var(--red-dim); color: var(--red); border: 1px solid rgba(248,113,113,0.15); }
.calc-alert-yellow { background: rgba(251,191,36,0.08); color: var(--yellow); border: 1px solid rgba(251,191,36,0.15); }

/* ── FOOTER ────────────────────────────────────────────── */
.app-footer {
  text-align: center; padding: 28px;
  font-size: 11px; color: var(--text-tertiary);
  border-top: 1px solid var(--border);
}

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

/* ── RESPONSIVE ────────────────────────────────────────── */
@media (max-width: 768px) {
  .app-header { padding: 0 16px; }
  .app-container { padding: 20px 16px 60px; }
  .calc-grid { grid-template-columns: 1fr; }
  .header-sub { display: none; }
  .calc-nav { gap: 4px; }
  .calc-nav-btn { padding: 6px 10px; font-size: 11px; }
  .output-hero-value { font-size: 28px; }
  .input-row { grid-template-columns: 1fr; }
}