/* Fender Generator — minimal marine-flavoured styling */
:root {
  --bg: #0b1f33;
  --panel: #14304d;
  --panel-2: #1b3e5f;
  --accent: #4cc9f0;
  --accent-2: #f4a261;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --success: #2dd4bf;
  --error: #ef4444;
  --border: #2c4a6b;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: var(--panel-2); padding: 0.1em 0.3em; border-radius: 3px; font-size: 0.92em; }

/* Topbar */
.topbar { background: var(--panel); border-bottom: 1px solid var(--border);
  padding: 0.8rem 1.5rem; display: flex; align-items: center; gap: 2rem; }
.topbar h1 { font-size: 1.2rem; margin: 0; }
.topbar nav { display: flex; align-items: center; gap: 1.2rem; margin-left: auto; }
.topbar nav a { color: var(--text); padding: 0.3rem 0.6rem; border-radius: 4px; }
.topbar nav a:hover { background: var(--panel-2); text-decoration: none; }
.topbar nav a.active { background: var(--panel-2); }
.topbar .user { color: var(--muted); font-size: 0.9em; }
.topbar .logout { color: var(--accent-2); }

/* Container */
.container { max-width: 960px; margin: 2rem auto; padding: 0 1.5rem; }

/* Login */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 8px;
  padding: 2rem; width: 100%; max-width: 380px; box-shadow: 0 4px 24px rgba(0,0,0,0.4); }
.login-card h1 { margin-top: 0; }
.login-card .subtitle { color: var(--muted); margin-top: -0.5rem; }
.login-card label { display: block; margin-top: 1rem; font-size: 0.9em; color: var(--muted); }
.login-card input { width: 100%; padding: 0.6rem; background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px; margin-top: 0.3rem; }
.login-card input:focus { outline: none; border-color: var(--accent); }
.login-card .footnote { color: var(--muted); font-size: 0.8em; margin-top: 1.5rem; text-align: center; }

/* Form */
.form-card, .result-card { background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 1.5rem; margin-bottom: 1.5rem; }
.form-card h2, .result-card h2 { margin-top: 0; color: var(--accent); }
fieldset { border: 1px solid var(--border); border-radius: 6px; padding: 1rem; margin-bottom: 1rem; }
legend { color: var(--accent-2); padding: 0 0.5rem; font-size: 0.9em; font-weight: 600; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 640px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

label { display: flex; flex-direction: column; font-size: 0.85em; color: var(--muted); }
label.check { flex-direction: row; align-items: center; gap: 0.5rem; color: var(--text); }
input, select { padding: 0.5rem; background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px; margin-top: 0.3rem; font: inherit; }
input:focus, select:focus { outline: none; border-color: var(--accent); }
select { cursor: pointer; }

/* Buttons */
button, .btn-primary, .btn-secondary, .btn-small { cursor: pointer;
  border: none; padding: 0.6rem 1.2rem; border-radius: 4px; font: inherit;
  display: inline-block; text-align: center; }
.btn-primary { background: var(--accent); color: var(--bg); font-weight: 600; }
.btn-primary:hover { background: #6dd5f5; text-decoration: none; }
.btn-secondary { background: var(--panel-2); color: var(--text); }
.btn-secondary:hover { background: #2a5078; text-decoration: none; }
.btn-small { padding: 0.3rem 0.7rem; font-size: 0.85em; background: var(--panel-2); color: var(--text); margin-right: 0.3rem; }
button[type=submit] { min-width: 160px; }

.actions { display: flex; gap: 1rem; align-items: center; margin-top: 1rem; flex-wrap: wrap; }

/* Status */
.status { color: var(--muted); font-size: 0.9em; }
.status.working { color: var(--accent-2); }
.status.ok { color: var(--success); }
.status.error { color: var(--error); }

/* Result */
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
@media (max-width: 640px) { .result-grid { grid-template-columns: 1fr; } }
.preview { background: var(--bg); border-radius: 6px; display: flex; align-items: center; justify-content: center; min-height: 280px; }
.preview img { max-width: 100%; max-height: 360px; }
.metrics dl { display: grid; grid-template-columns: 1fr auto; gap: 0.4rem 1rem; margin: 0.5rem 0; }
.metrics dt { color: var(--muted); }
.metrics dd { margin: 0; font-variant-numeric: tabular-nums; }
.metrics h3 { margin-bottom: 0.3rem; color: var(--muted); font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.05em; }

/* History */
.history { width: 100%; border-collapse: collapse; background: var(--panel); border-radius: 8px; overflow: hidden; }
.history th, .history td { padding: 0.7rem; text-align: left; border-bottom: 1px solid var(--border); }
.history th { background: var(--panel-2); color: var(--accent); font-size: 0.85em; }
.history td { font-variant-numeric: tabular-nums; font-size: 0.92em; }
.actions-cell { white-space: nowrap; }
.empty { color: var(--muted); padding: 2rem; text-align: center; }

/* Assumptions */
.assumptions { background: var(--panel-2); padding: 1rem 1.5rem; border-radius: 6px;
  font-size: 0.85em; color: var(--muted); }
.assumptions h3 { margin-top: 0; color: var(--muted); font-size: 0.85em; text-transform: uppercase; }
.assumptions ul { margin: 0; padding-left: 1.5rem; }

/* Alert */
.alert { padding: 0.7rem 1rem; border-radius: 4px; margin-bottom: 1rem; }
.alert-error { background: rgba(239, 68, 68, 0.15); color: #fca5a5; border: 1px solid var(--error); }