/* OnceHesap theme — electric indigo/blue, geometric sans, sharper corners. */
:root {
  --color-bg: #ffffff;
  --color-surface: #f4f7ff;
  --color-text: #0b1220;
  --color-text-muted: #4a5878;
  --color-border: #dde6f5;
  --color-primary: #1e6bff;
  --color-primary-dark: #1e40af;
  --color-primary-soft: #e0e9ff;
  --color-accent: #06b6d4;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --shadow-sm: 0 1px 2px rgba(30, 64, 175, .08);
  --shadow-md: 0 4px 16px rgba(30, 64, 175, .12);
  --shadow-lg: 0 12px 40px rgba(30, 64, 175, .18);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --font-display: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

.brand-name { font-family: var(--font-display); font-weight: 800; letter-spacing: -.025em; text-transform: lowercase; }
.hero h1 { font-family: var(--font-display); font-weight: 800; letter-spacing: -.03em; }
.calc-grid-section h2,
.calc-header h1,
.calc-result h2 { font-family: var(--font-display); font-weight: 700; letter-spacing: -.02em; }
.calc-icon-lg { background: linear-gradient(135deg, #e0e9ff 0%, #c7d6ff 100%); }
.calc-card { background: linear-gradient(180deg, #ffffff 0%, #f9fbff 100%); }
.btn-primary { background: linear-gradient(135deg, #1e6bff 0%, #1e40af 100%); }
.btn-primary:hover { background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%); }