/* D-BEAM Calculator — modern, responsive, engineer-aesthetic styles */

:root {
  --c-primary: #1a3a5c;
  --c-primary-light: #2d5a8a;
  --c-accent: #c47c2c;
  --c-bg: #f5f6f8;
  --c-surface: #ffffff;
  --c-border: #d8dce3;
  --c-text: #1a1a1a;
  --c-muted: #5a6172;
  --c-success: #1d5731;
  --c-success-bg: #e6f4ea;
  --c-error: #8b0000;
  --c-error-bg: #fde8e8;
  --c-warning: #b8860b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--c-text); background: var(--c-bg); line-height: 1.5; }

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.container { max-width: 1280px; margin: 0 auto; padding: 24px; }
.container--narrow { max-width: 520px; }

/* Top bar */
.topbar { background: var(--c-primary); color: white; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; box-shadow: var(--shadow-sm); }
.topbar .brand { color: white; font-size: 18px; font-weight: 600; text-decoration: none; }
.topbar .brand:hover { opacity: 0.9; text-decoration: none; }
.topnav { display: flex; gap: 8px; align-items: center; }
.topnav a, .topnav button { color: white; padding: 6px 14px; border-radius: 4px; font-size: 14px; background: transparent; border: 1px solid transparent; cursor: pointer; font-family: inherit; }
.topnav a:hover, .topnav button:hover { background: rgba(255,255,255,0.1); text-decoration: none; }

/* Footer */
.footer { color: var(--c-muted); font-size: 12px; padding: 20px 24px; text-align: center; border-top: 1px solid var(--c-border); margin-top: 40px; }

/* Surfaces */
.card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 8px; padding: 24px; box-shadow: var(--shadow-sm); margin-bottom: 16px; }
.card h2 { margin-top: 0; color: var(--c-primary); font-size: 18px; }
.card h3 { color: var(--c-primary); font-size: 14px; text-transform: uppercase; letter-spacing: 0.5px; margin: 18px 0 8px 0; }

/* Forms */
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--c-muted); margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--c-border); border-radius: 6px; font-size: 14px; font-family: inherit; background: white;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(26,58,92,0.1); }
.form-group .hint { font-size: 11px; color: var(--c-muted); margin-top: 4px; }
.form-group--checkbox { display: flex; align-items: flex-start; gap: 8px; }
.form-group--checkbox input { width: auto; margin-top: 3px; }
.form-group--checkbox label { font-size: 13px; color: var(--c-text); margin: 0; }

/* Buttons */
.btn { display: inline-block; padding: 10px 18px; border-radius: 6px; font-size: 14px; font-weight: 500; cursor: pointer; border: 1px solid transparent; text-align: center; font-family: inherit; transition: background 0.15s, transform 0.05s; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--c-primary); color: white; }
.btn--primary:hover { background: var(--c-primary-light); text-decoration: none; }
.btn--secondary { background: white; color: var(--c-primary); border-color: var(--c-border); }
.btn--secondary:hover { background: var(--c-bg); }
.btn--block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Two-column layout (calculator) */
.cols { display: grid; grid-template-columns: 380px 1fr; gap: 20px; }
@media (max-width: 900px) { .cols { grid-template-columns: 1fr; } }

/* Status badges */
.badge { display: inline-block; padding: 3px 10px; border-radius: 4px; font-size: 12px; font-weight: 600; }
.badge-OK { background: var(--c-success-bg); color: var(--c-success); }
.badge-NG { background: var(--c-error-bg); color: var(--c-error); }
.badge-NA { background: #eef0f3; color: var(--c-muted); }

/* Results table */
.checks-list { display: flex; flex-direction: column; gap: 6px; }
.check-row { display: grid; grid-template-columns: 1fr 110px 110px 70px 60px; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 5px; background: var(--c-bg); font-size: 13px; }
.check-row.OK { border-left: 3px solid var(--c-success); }
.check-row.NG { border-left: 3px solid var(--c-error); }
.check-row.NA { border-left: 3px solid #ccc; }
.check-row .check-name { font-weight: 500; }
.check-row .check-value { color: var(--c-muted); text-align: right; font-variant-numeric: tabular-nums; }

/* Summary tiles */
.summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 16px; }
@media (max-width: 600px) { .summary { grid-template-columns: 1fr; } }
.summary-tile { background: var(--c-primary); color: white; padding: 14px 18px; border-radius: 8px; }
.summary-tile .label { font-size: 11px; opacity: 0.85; text-transform: uppercase; letter-spacing: 0.5px; }
.summary-tile .value { font-size: 22px; font-weight: 600; margin-top: 4px; font-variant-numeric: tabular-nums; }

/* Flash/error messages */
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 14px; }
.flash--error { background: var(--c-error-bg); color: var(--c-error); border-left: 3px solid var(--c-error); }
.flash--success { background: var(--c-success-bg); color: var(--c-success); border-left: 3px solid var(--c-success); }
.flash--info { background: #e8f0fe; color: var(--c-primary); border-left: 3px solid var(--c-primary); }

/* Loading */
.loading { text-align: center; padding: 30px; color: var(--c-muted); }
.loading::after { content: ''; display: inline-block; width: 20px; height: 20px; border: 2px solid var(--c-border); border-top-color: var(--c-primary); border-radius: 50%; animation: spin 0.8s linear infinite; margin-left: 8px; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Section sketch SVG container */
.section-sketch { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 6px; padding: 16px; }
.section-sketch svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }

/* EULA box */
.eula-box { max-height: 200px; overflow-y: auto; border: 1px solid var(--c-border); padding: 12px; border-radius: 6px; background: var(--c-bg); font-size: 12px; line-height: 1.5; color: var(--c-muted); margin-bottom: 8px; }