/*
 * styles.css — Transport e_td Calculator (slim brand stylesheet)
 * Mined from the old build's design system (champagne gold #c5a059 on dark).
 * Strictly transport-only — no full-chain UI, no mode switcher, no chain panel.
 */

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

:root {
  --gold:        #c5a059;
  --gold-light:  #d4b47a;
  --gold-dim:    rgba(197,160,89,.15);
  --gold-border: rgba(197,160,89,.25);
  --bg:          #0d0f13;
  --bg-card:     #151820;
  --bg-block:    #1a1e28;
  --bg-hover:    #1e2330;
  --border:      rgba(255,255,255,.07);
  --border-light:rgba(255,255,255,.12);
  --text:        #e8eaf0;
  --text-muted:  #6b7280;
  --text-dim:    #9ca3af;
  --red:         #f87171;
  --green:       #4ade80;
  --blue:        #60a5fa;
  --yellow:      #fbbf24;
  --orange-cell: #f6c177;
  --green-cell:  #6ad29a;

  --radius:      8px;
  --radius-lg:   12px;
  --shadow:      0 2px 12px rgba(0,0,0,.4);
  --shadow-lg:   0 4px 24px rgba(0,0,0,.6);
}

html { font-size: 14px; }
body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh; line-height: 1.5;
}
a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-light); }

h1,h2,h3,h4 { font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }

small, .muted { font-size: .82rem; color: var(--text-dim); }

/* ── Login screen ──────────────────────────────────────────────────────── */
.login-wrap {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 24px;
  background: radial-gradient(ellipse at 30% 20%, rgba(197,160,89,.06) 0%, transparent 60%);
}
.login-card {
  background: var(--bg-card); border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg); padding: 36px 32px;
  width: 100%; max-width: 440px; box-shadow: var(--shadow-lg);
}
.login-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.ga-logo-img {
  display: block;
  object-fit: contain;
  border-radius: 8px;
  background: rgba(197,160,89,0.05);
  padding: 4px;
  border: 1px solid rgba(197,160,89,0.2);
  flex-shrink: 0;
}
.login-logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.login-logo-text .brand { color: var(--gold); font-size: .82rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }
.login-logo-text .tool  { color: var(--text-muted); font-size: .72rem; }
.login-title { color: var(--text); margin-bottom: 6px; font-size: 1.4rem; }
.login-sub   { color: var(--text-muted); font-size: .85rem; margin-bottom: 18px; }
.scope-box {
  background: var(--bg-block); border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius); padding: 12px 14px; margin-bottom: 18px;
  font-size: .82rem; color: var(--text-dim);
}
.scope-box .scope-title { color: var(--text); font-weight: 600; margin-bottom: 6px; }
.scope-box ul { list-style: none; padding-left: 0; }
.scope-box li { margin: 4px 0; padding-left: 14px; position: relative; }
.scope-box li::before { content: "—"; position: absolute; left: 0; color: var(--gold); }
.login-error { background: rgba(248,113,113,.12); border: 1px solid rgba(248,113,113,.3);
  color: var(--red); padding: 8px 12px; border-radius: var(--radius); margin-bottom: 12px; font-size: .85rem; }
.login-form label { display: block; font-size: .82rem; color: var(--text-muted); margin-bottom: 6px; }
.login-form input[type="password"] {
  width: 100%; padding: 10px 12px; border-radius: var(--radius);
  border: 1px solid var(--border-light); background: var(--bg-block);
  color: var(--text); font-family: inherit; margin-bottom: 12px;
}
.login-form input[type="password"]:focus { outline: 1px solid var(--gold); border-color: var(--gold); }
.btn-login {
  width: 100%; padding: 10px 14px; border: 0; border-radius: var(--radius);
  background: var(--gold); color: #0d0f13; font-weight: 600; cursor: pointer;
}
.btn-login:hover { background: var(--gold-light); }

/* ── App shell ─────────────────────────────────────────────────────────── */
.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 22px; background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}
.header-brand { display: flex; align-items: center; gap: 10px; }
.header-brand-name { color: var(--gold); font-weight: 600; font-size: .9rem; letter-spacing: .03em; }
.header-brand-tool { color: var(--text-muted); font-size: .78rem; }
.header-actions { display: flex; gap: 8px; }
.header-btn {
  background: var(--bg-block); color: var(--text); border: 1px solid var(--border-light);
  padding: 6px 12px; border-radius: var(--radius); font-size: .82rem; cursor: pointer;
}
.header-btn:hover { background: var(--bg-hover); }

/* ── Scope banner ──────────────────────────────────────────────────────── */
.scope-banner {
  background: rgba(197,160,89,.08); border-bottom: 1px solid var(--gold-border);
  padding: 10px 22px; font-size: .82rem; color: var(--text-dim);
}
.scope-banner strong { color: var(--gold); }

/* ── Main grid ─────────────────────────────────────────────────────────── */
.app-body {
  display: grid; grid-template-columns: 1fr 360px; gap: 18px;
  padding: 18px 22px; min-height: calc(100vh - 110px);
}
.calc-panel, .results-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 16px 18px;
}
.section-title {
  font-size: .92rem; color: var(--gold); text-transform: uppercase; letter-spacing: .06em;
  margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border);
}

/* ── Leg table ─────────────────────────────────────────────────────────── */
.leg-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.leg-table { width: 100%; border-collapse: collapse; font-size: .82rem; min-width: 1400px; }
.leg-table th, .leg-table td {
  padding: 6px 8px; border-bottom: 1px solid var(--border);
  text-align: left; vertical-align: top; white-space: nowrap;
}
.leg-table th {
  background: var(--bg-block); color: var(--text-muted); font-weight: 600;
  font-size: .72rem; text-transform: uppercase; letter-spacing: .04em;
  position: sticky; top: 0; z-index: 1;
}
.leg-table tr:hover td { background: rgba(197,160,89,.04); }
.leg-table input, .leg-table select {
  background: transparent; color: var(--text); border: 1px solid transparent;
  border-radius: 4px; padding: 3px 5px; font-size: .82rem; width: 100%;
  font-family: inherit;
}
.leg-table input:focus, .leg-table select:focus { outline: 1px solid var(--gold); border-color: var(--gold); background: var(--bg-block); }

/* Orange = user input, green = formula (mirrors Excel cell coding) */
.leg-table .orange-cell input, .leg-table .orange-cell select {
  background: rgba(246,193,119,.10); border-color: rgba(246,193,119,.35);
}
.leg-table .green-cell { color: var(--green-cell); background: rgba(106,210,154,.06); font-variant-numeric: tabular-nums; }
.leg-table .green-cell-strong { color: var(--green-cell); background: rgba(106,210,154,.12); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ── Conditional input visibility per method ───────────────────────────── */
.leg-table .when-m1, .leg-table .when-m2, .leg-table .when-m3,
.leg-table .when-m4, .leg-table .when-m5 { display: none; }
.leg-row[data-method="M1"] .when-m1 { display: table-cell; }
.leg-row[data-method="M2"] .when-m2 { display: table-cell; }
.leg-row[data-method="M3"] .when-m3 { display: table-cell; }
.leg-row[data-method="M4"] .when-m4 { display: table-cell; }
.leg-row[data-method="M5"] .when-m5 { display: table-cell; }

/* ── Badges ────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: .68rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em;
  white-space: nowrap;
}
.badge-ok    { background: rgba(74,222,128,.15);  color: var(--green);  border: 1px solid rgba(74,222,128,.3); }
.badge-warn  { background: rgba(251,191,36,.15);  color: var(--yellow); border: 1px solid rgba(251,191,36,.3); }
.badge-err   { background: rgba(248,113,113,.15); color: var(--red);    border: 1px solid rgba(248,113,113,.3); }
.badge-muted { background: rgba(255,255,255,.06); color: var(--text-dim); border: 1px solid var(--border); }

/* ── Add-on block ──────────────────────────────────────────────────────── */
.addon-card {
  background: var(--bg-block); border: 1px solid var(--border-light);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius); padding: 14px 16px; margin-top: 18px;
}
.addon-card .addon-warning {
  background: rgba(251,191,36,.08); border: 1px solid rgba(251,191,36,.25);
  color: var(--yellow); border-radius: var(--radius); padding: 8px 10px;
  font-size: .78rem; margin-bottom: 10px;
}
.addon-grid {
  display: grid; grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 10px 14px; margin-top: 10px;
}
.addon-grid label { display: flex; flex-direction: column; font-size: .76rem; color: var(--text-muted); gap: 4px; }
.addon-grid input, .addon-grid select {
  padding: 5px 8px; border-radius: var(--radius); border: 1px solid var(--border-light);
  background: rgba(246,193,119,.10); color: var(--text); font-family: inherit;
}
.addon-grid input:focus, .addon-grid select:focus { outline: 1px solid var(--gold); border-color: var(--gold); }
.addon-results {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
  margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border);
}
.addon-results .addon-stat {
  background: rgba(106,210,154,.06); border: 1px solid rgba(106,210,154,.18);
  border-radius: var(--radius); padding: 8px 10px;
}
.addon-results .addon-stat .label { font-size: .72rem; color: var(--text-muted); }
.addon-results .addon-stat .value { font-size: 1rem; color: var(--green-cell); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ── Final distribution stage sub-blocks (A / B / C) ─────────────────── */
.dist-subblock {
  margin-top: 14px;
  padding: 12px 14px;
  background: rgba(255,255,255,.02);
  border: 1px solid var(--border);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
}
.dist-subblock.dist-combined { border-left-color: var(--gold); }
.dist-sub-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.dist-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px; height: 24px;
  background: var(--blue);
  color: #0d0f13;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
}
.dist-combined .dist-letter { background: var(--gold); }
.dist-sub-body { padding-left: 30px; }
.dist-sub-body p { color: var(--text-dim); }
.dist-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  padding: 6px 0;
}
.dist-toggle input { width: 18px; height: 18px; cursor: pointer; accent-color: var(--gold); }
.dist-formula {
  background: rgba(0,0,0,.3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 11.5px;
  color: var(--gold-light);
  margin: 6px 0;
  overflow-x: auto;
}

/* ── Totals panel (right side) ─────────────────────────────────────────── */
.results-panel .totals-stat {
  background: var(--bg-block); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px 12px; margin-bottom: 8px;
}
.results-panel .totals-stat .label { font-size: .76rem; color: var(--text-muted); }
.results-panel .totals-stat .value { font-size: 1.4rem; color: var(--gold); font-weight: 600; font-variant-numeric: tabular-nums; }
.results-panel .totals-stat .sub   { font-size: .72rem; color: var(--text-dim); }

.evidence-list { font-size: .76rem; color: var(--text-dim); margin-top: 12px; }
.evidence-list li { margin: 4px 0; padding-left: 12px; position: relative; }
.evidence-list li::before { content: "·"; position: absolute; left: 0; color: var(--gold); }

/* ── Buttons ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 12px; border-radius: var(--radius); font-size: .82rem;
  border: 1px solid var(--border-light); background: var(--bg-block);
  color: var(--text); cursor: pointer; font-family: inherit;
}
.btn:hover { background: var(--bg-hover); }
.btn-primary { background: var(--gold); color: #0d0f13; border-color: var(--gold); }
.btn-primary:hover { background: var(--gold-light); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }

/* ── Methods guide accordion ───────────────────────────────────────────── */
.guide details {
  background: var(--bg-block); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 8px 12px; margin-bottom: 6px;
}
.guide summary { cursor: pointer; font-size: .85rem; color: var(--text); list-style: none; }
.guide summary::-webkit-details-marker { display: none; }
.guide details[open] summary { color: var(--gold); }
.guide details p { font-size: .8rem; color: var(--text-dim); margin: 8px 0; }

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .app-body { grid-template-columns: 1fr; }
  .results-panel { position: static; }
}