/*
 * styles.css
 * RED/ISCC Supply Chain GHG Calculator — Design System
 * iscctd.ga-advice.com
 *
 * Visual identity: dark background, champagne gold (#c5a059)
 * Matches ga-advice.com brand style
 */

/* ── Reset & base ──────────────────────────────────────────────────────────── */

*, *::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;
  --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); }

/* ── Typography ────────────────────────────────────────────────────────────── */

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; }

small { font-size: 0.82rem; 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: 40px 36px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.login-logo-text {
  display: flex;
  flex-direction: column;
}

.login-logo-text .brand {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gold);
}

.login-logo-text .tool {
  font-size: 11px;
  color: var(--text-muted);
}

.login-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.login-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.scope-box {
  background: var(--gold-dim);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 24px;
}

.scope-box .scope-title {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: .12em;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 8px;
}

.scope-box ul {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.7;
  padding-left: 16px;
}

.scope-box li strong { color: var(--red); }

.login-form label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.login-form input[type="password"],
.login-form input[type="text"] {
  width: 100%;
  background: var(--bg-block);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 10px 14px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color .2s;
  margin-bottom: 16px;
}

.login-form input:focus {
  border-color: var(--gold);
}

.btn-login {
  width: 100%;
  background: var(--gold);
  color: #0d0f13;
  border: none;
  border-radius: var(--radius);
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background .2s, transform .1s;
}

.btn-login:hover { background: var(--gold-light); }
.btn-login:active { transform: scale(.98); }

.login-error {
  background: rgba(248,113,113,.1);
  border: 1px solid rgba(248,113,113,.3);
  border-radius: var(--radius);
  padding: 10px 14px;
  color: var(--red);
  font-size: 12px;
  margin-bottom: 16px;
}

/* ── App layout ────────────────────────────────────────────────────────────── */

.app-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.header-brand-name {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gold);
}

.header-brand-tool {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  padding-left: 14px;
  border-left: 1px solid var(--border-light);
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.header-btn {
  background: none;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 5px 12px;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}

.header-btn:hover { border-color: var(--gold); color: var(--gold); }

.app-body {
  display: grid;
  grid-template-columns: 1fr 360px;
  grid-template-rows: auto 1fr;
  height: calc(100vh - 56px);
  overflow: hidden;
}

/* ── Mode bar ──────────────────────────────────────────────────────────────── */

.mode-bar {
  grid-column: 1 / -1;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mode-bar-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-muted);
}

#mode-selector {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-block);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 12px;
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color .2s, color .2s, background .2s;
  white-space: nowrap;
}

.mode-btn:hover {
  border-color: var(--gold-border);
  color: var(--text);
  background: var(--bg-hover);
}

.mode-btn.active {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--gold-dim);
}

.mode-btn .mode-icon { font-size: 14px; }
.mode-btn .mode-label { font-size: 11.5px; }

#mode-description {
  font-size: 11px;
  color: var(--text-muted);
  padding-top: 2px;
}

/* ── Chain builder (left panel) ────────────────────────────────────────────── */

.chain-panel {
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-right: 1px solid var(--border);
}

/* ── Chain blocks ──────────────────────────────────────────────────────────── */

.chain-block {
  background: var(--bg-block);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: border-color .2s;
}

.chain-block:hover { border-color: var(--border-light); }

.origin-block   { border-left: 3px solid #4ade80; }
.sd-block       { border-left: 3px solid #60a5fa; }
.leg-block      { border-left: 3px solid #54d4e0; }
.interface-block{ border-left: 3px solid #c5a059; }
.final-block    { border-left: 3px solid #c554e0; }

.block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(0,0,0,.2);
  border-bottom: 1px solid var(--border);
}

.block-icon { font-size: 15px; }

.block-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
}

.block-tag {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 7px;
}

.block-actions {
  display: flex;
  gap: 4px;
  margin-left: 6px;
}

.block-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Form elements ─────────────────────────────────────────────────────────── */

.form-row { display: flex; flex-direction: column; gap: 4px; }

.form-row label,
.form-row-2col label,
.form-grid-3 label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
}

.form-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.form-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

select, input[type="number"], input[type="text"] {
  background: rgba(0,0,0,.3);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 7px 10px;
  color: var(--text);
  font-size: 13px;
  outline: none;
  width: 100%;
  transition: border-color .2s;
}

select:focus, input:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 2px rgba(197,160,89,.15);
}

.input-sm { padding: 5px 8px; font-size: 12px; }

.field-unit {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
  display: block;
}

.value-display {
  background: rgba(0,0,0,.3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--gold-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.value-display.small { font-size: 11px; padding: 5px 8px; }
.value-display small { color: var(--text-muted); font-size: 11px; }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-dim);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 400;
}

.checkbox-label input[type="checkbox"] {
  width: auto;
  accent-color: var(--gold);
}

/* ── Info boxes ────────────────────────────────────────────────────────────── */

.info-box {
  background: rgba(96,165,250,.07);
  border: 1px solid rgba(96,165,250,.2);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.5;
}

.info-box.warning {
  background: rgba(251,191,36,.07);
  border-color: rgba(251,191,36,.25);
  color: var(--yellow);
}

.block-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Tables ────────────────────────────────────────────────────────────────── */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

th {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-muted);
  font-weight: 600;
  padding: 5px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 5px 8px;
  vertical-align: middle;
  border-bottom: 1px solid rgba(255,255,255,.03);
}

.ep-table td, .product-table td, .blend-table td { padding: 4px 6px; }

/* ── Buttons ───────────────────────────────────────────────────────────────── */

.btn-secondary {
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 6px 12px;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}

.btn-secondary:hover { border-color: var(--gold); color: var(--gold); }
.btn-secondary.small { padding: 4px 9px; font-size: 11px; }

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 7px;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}

.btn-icon:hover { border-color: var(--border-light); color: var(--text); }
.btn-icon.danger:hover { border-color: rgba(248,113,113,.4); color: var(--red); }

/* ── Add-step bar ──────────────────────────────────────────────────────────── */

.add-step-bar {
  display: flex;
  gap: 10px;
}

.btn-add-leg, .btn-add-interface {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: var(--bg-block);
  border: 1px dashed var(--border-light);
  border-radius: var(--radius);
  padding: 12px;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}

.btn-add-leg:hover { border-color: #54d4e0; background: rgba(84,212,224,.05); }
.btn-add-interface:hover { border-color: var(--gold); background: var(--gold-dim); }

.btn-add-leg span, .btn-add-interface span {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.btn-add-leg:hover span { color: #54d4e0; }
.btn-add-interface:hover span { color: var(--gold); }

.btn-add-leg small, .btn-add-interface small {
  font-size: 10.5px;
  color: var(--text-muted);
  text-align: center;
}

/* ── Subsections within blocks ─────────────────────────────────────────────── */

.subsection-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .1em;
  font-weight: 700;
  color: var(--gold);
  padding-top: 6px;
  border-top: 1px solid var(--border);
}

.subsection-hint {
  font-size: 10.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Results panel (right) ─────────────────────────────────────────────────── */

.results-panel {
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.result-empty-icon { font-size: 36px; display: block; margin-bottom: 16px; }
.result-empty p { font-size: 13px; line-height: 1.6; }
.result-empty .hint { font-size: 11px; color: var(--text-muted); margin-top: 8px; }

.result-error {
  background: rgba(248,113,113,.08);
  border: 1px solid rgba(248,113,113,.25);
  border-radius: var(--radius);
  padding: 12px;
  color: var(--red);
  font-size: 12px;
  line-height: 1.5;
}

.results-card {
  background: var(--bg-block);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.result-main {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-bottom: 1px solid var(--border);
}

.result-main.result-pass { border-top: 3px solid var(--green); }
.result-main.result-fail { border-top: 3px solid var(--red); }

.result-eb { display: flex; align-items: baseline; gap: 8px; }
.result-eb-label { font-size: 12px; color: var(--text-muted); }
.result-eb-value { font-size: 1.8rem; font-weight: 700; color: var(--text); }

.result-saving {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.saving-pct {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
}

.result-badge {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  width: fit-content;
}

.result-badge.result-pass { background: rgba(74,222,128,.1); color: var(--green); }
.result-badge.result-fail { background: rgba(248,113,113,.1); color: var(--red); }

.result-threshold { font-size: 11px; color: var(--text-muted); }

/* ── Component bar ─────────────────────────────────────────────────────────── */

.result-bar { padding: 12px 14px; border-bottom: 1px solid var(--border); }

.bar-track {
  display: flex;
  border-radius: 4px;
  overflow: hidden;
  height: 24px;
  background: rgba(0,0,0,.3);
}

.bar-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: rgba(0,0,0,.7);
  transition: opacity .2s;
  cursor: default;
}

.bar-segment:hover { opacity: .85; }

/* ── Component table ───────────────────────────────────────────────────────── */

.component-table { font-size: 12px; }
.component-table td { padding: 5px 14px; }
.component-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.component-table .component-total td {
  border-top: 1px solid var(--border-light);
  font-weight: 700;
  color: var(--text);
}

.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

.saving { color: var(--green); margin-right: 2px; }

.result-meta {
  padding: 8px 14px;
  font-size: 10.5px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ── Audit trail ───────────────────────────────────────────────────────────── */

.audit-section {
  background: var(--bg-block);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.audit-toggle {
  width: 100%;
  background: none;
  border: none;
  padding: 10px 14px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color .2s;
}

.audit-toggle:hover { color: var(--text); }

.audit-content {
  border-top: 1px solid var(--border);
  max-height: 320px;
  overflow-y: auto;
}

.audit-entry {
  padding: 8px 14px;
  border-bottom: 1px solid rgba(255,255,255,.03);
  font-size: 11px;
  display: flex;
  gap: 8px;
  align-items: flex-start;
  line-height: 1.5;
}

.audit-num {
  font-size: 9px;
  color: var(--gold);
  font-weight: 700;
  min-width: 18px;
  text-align: right;
  padding-top: 1px;
}

.audit-step { color: var(--text); font-weight: 500; }
.audit-detail { color: var(--text-muted); font-size: 10.5px; margin-top: 2px; }
.audit-values { color: var(--text-dim); font-size: 10.5px; margin-top: 3px; display: flex; flex-wrap: wrap; gap: 6px; }

.audit-empty { padding: 12px 14px; color: var(--text-muted); font-size: 11px; }

/* ── Export button ─────────────────────────────────────────────────────────── */

.export-section { display: flex; justify-content: flex-end; }

.btn-export {
  background: var(--gold-dim);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius);
  padding: 8px 16px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, color .2s;
}

.btn-export:hover { background: var(--gold); color: #0d0f13; }

/* ── AI panel toggle ───────────────────────────────────────────────────────── */

.ai-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--gold);
  color: #0d0f13;
  border: none;
  border-radius: 50px;
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(197,160,89,.4);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 200;
  transition: transform .2s, box-shadow .2s;
}

.ai-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(197,160,89,.5);
}

/* ── AI Panel overlay ──────────────────────────────────────────────────────── */

.ai-panel-overlay {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: 420px;
  background: var(--bg-card);
  border-left: 1px solid var(--gold-border);
  z-index: 300;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0,0,0,.5);
  transform: translateX(100%);
  transition: transform .3s cubic-bezier(.4,0,.2,1);
}

.ai-panel-overlay.open { transform: translateX(0); }

/* ── Scrollbars ────────────────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.2); }

/* ── Responsive ────────────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  .app-body {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }
  .results-panel {
    display: none;
  }
  .ai-panel-overlay {
    width: 100%;
  }
}

/* ── Utility ───────────────────────────────────────────────────────────────── */

.hidden { display: none !important; }
.flex { display: flex; }
.gap-8 { gap: 8px; }
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }