/* ==========================================================
   Alta Cloud TCO Calculator · Alta Internal Tools Theme
   Scope: visual/theme only. Business logic lives in tco-*.js.
   Default: DARK mode, per Internal Alta Theme. Light mode remains available.
   ========================================================== */

:root,
[data-theme="dark"] {
  color-scheme: dark;
  --alta-bg-main: #0A0F1F;
  --alta-bg-surface: #121A33;
  --alta-bg-elevated: #1A233A;
  --alta-bg-inset: #070C18;
  --alta-text-primary: #E0E0E0;
  --alta-text-secondary: #8F9BB3;
  --alta-accent-primary: #2962FF;
  --alta-accent-glow: #00FFFF;
  --alta-accent-readable: #00FFFF;
  --alta-border-subtle: #2A3141;
  --alta-border-strong: #3B455F;

  --bg: var(--alta-bg-main);
  --panel: var(--alta-bg-surface);
  --panel-alt: var(--alta-bg-elevated);
  --ink: var(--alta-text-primary);
  --muted: var(--alta-text-secondary);
  --line: var(--alta-border-subtle);
  --input-bg: var(--alta-bg-inset);
  --focus-bg: var(--alta-bg-inset);
  --panel-bg: rgba(18, 26, 51, .96);
  --topbar-bg: rgba(18, 26, 51, .94);
  --hero-bg: rgba(18, 26, 51, .78);
  --onprem: #8F9BB3;
  --cloud: #00FFFF;
  --hybrid: #F5A524;
  --danger: #FF4D4F;
  --success: #18C964;
  --info: #00B8FF;
  --warning: #F5A524;
  --shadow-soft: 0 18px 50px rgba(0, 0, 0, .32);
  --shadow-glow: 0 0 0 1px rgba(0, 255, 255, .18), 0 0 24px rgba(0, 255, 255, .16);
}

[data-theme="light"] {
  color-scheme: light;
  --alta-bg-main: #F4F5F7;
  --alta-bg-surface: #FFFFFF;
  --alta-bg-elevated: #FAFAFA;
  --alta-bg-inset: #F0F3F8;
  --alta-text-primary: #333333;
  --alta-text-secondary: #6B7280;
  --alta-accent-primary: #2962FF;
  --alta-accent-glow: #00FFCC;
  --alta-accent-readable: #2962FF;
  --alta-border-subtle: #E5E7EB;
  --alta-border-strong: #CBD5E1;

  --bg: var(--alta-bg-main);
  --panel: var(--alta-bg-surface);
  --panel-alt: var(--alta-bg-elevated);
  --ink: var(--alta-text-primary);
  --muted: var(--alta-text-secondary);
  --line: var(--alta-border-subtle);
  --input-bg: #F7F8FB;
  --focus-bg: #FFFFFF;
  --panel-bg: rgba(255, 255, 255, .95);
  --topbar-bg: rgba(255, 255, 255, .92);
  --hero-bg: rgba(255, 255, 255, .78);
  --onprem: #64748B;
  --cloud: var(--alta-accent-primary);
  --hybrid: #F59E0B;
  --danger: #D92D20;
  --success: #16A34A;
  --info: #0077B6;
  --warning: #B45309;
  --shadow-soft: 0 16px 40px rgba(17, 24, 39, .10);
  --shadow-glow: 0 0 0 1px rgba(0, 255, 204, .35), 0 0 18px rgba(0, 255, 204, .16);
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top right, color-mix(in srgb, var(--alta-accent-primary) 24%, transparent), transparent 34rem),
    radial-gradient(circle at 12% 6%, color-mix(in srgb, var(--alta-accent-glow) 12%, transparent), transparent 30rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .18;
  background-image:
    linear-gradient(color-mix(in srgb, var(--alta-accent-glow) 16%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--alta-accent-primary) 12%, transparent) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(circle at 58% 14%, black, transparent 70%);
}
body > * { position: relative; z-index: 1; }
a { color: var(--alta-accent-readable); }

.topbar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 26px;
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(17, 24, 39, .06);
  backdrop-filter: blur(14px);
}
.brand-link { text-decoration: none; color: inherit; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--alta-accent-primary), var(--alta-accent-glow));
  box-shadow: var(--shadow-glow);
}
.brand-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
}
.brand-sub {
  display: block;
  margin-top: 1px;
  color: var(--muted);
  font-size: 12px;
}
.spacer { flex: 1; }
.nav-link,
.theme-toggle,
.internal-ribbon {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  background: var(--panel);
  cursor: pointer;
}
.nav-link:hover,
.theme-toggle:hover { border-color: var(--alta-accent-glow); color: var(--ink); box-shadow: var(--shadow-glow); }
.internal-ribbon { cursor: default; color: var(--muted); background: color-mix(in srgb, var(--panel-alt) 86%, transparent); }

.shell {
  width: 100%;
  max-width: none;
  min-height: calc(100vh - 75px);
  margin: 0;
  padding: 0;
}
.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 26px 28px;
  background: var(--hero-bg);
  border-bottom: 1px solid var(--line);
}
.hero::after { content: none; }
.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--alta-accent-readable);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.hero h1 {
  margin: 0;
  font-size: 34px;
  line-height: 1.06;
  letter-spacing: -.03em;
  font-weight: 700;
}
.hero p {
  display: block;
  max-width: 760px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.hero-stat {
  display: flex;
  gap: 10px;
  min-width: 0;
}
.hero-stat div {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 13px;
  min-width: unset;
  background: var(--panel);
}
.hero-stat span,
.hero-stat strong {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  text-transform: uppercase;
  font-weight: 700;
}
.hero-stat span { display: none; }

.grid {
  display: grid;
  grid-template-columns: 390px 1fr;
  gap: 18px;
  align-items: start;
  min-height: calc(100vh - 188px);
  padding: 18px 24px 0 0;
}
.panel {
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-soft);
}
aside.panel {
  position: sticky;
  top: 0;
  border-radius: 0 12px 12px 0;
  border-width: 1px 1px 1px 0;
  padding: 22px 24px 28px;
  min-height: calc(100vh - 188px);
}
.panel h2,
.panel h3 {
  margin: 0 0 12px;
  font-weight: 700;
  letter-spacing: -.01em;
}
aside.panel h2 { display: block; font-size: 20px; }
.form-intro {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.55;
}
.form-intro b { color: var(--ink); font-weight: 700; }
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 176px;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.25;
}
label.wide { grid-column: auto; }
label small {
  grid-column: 2;
  margin-top: -7px;
  color: var(--muted);
  font-size: 10.5px;
}
input,
select {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--ink);
  padding: 7px 10px;
  font: inherit;
  outline: none;
  text-align: right;
}
select { text-align: left; }
input:focus,
select:focus {
  border-color: var(--alta-accent-glow);
  box-shadow: var(--shadow-glow);
  background: var(--focus-bg);
}
select option { background: var(--panel); color: var(--ink); }
.check {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.check input { width: 18px; min-height: 18px; accent-color: var(--alta-accent-primary); }

details {
  margin: 0;
  border: 0;
  padding: 0;
}
summary {
  list-style: none;
  cursor: pointer;
  margin: 18px 0 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--alta-accent-readable);
  text-transform: uppercase;
}
summary::-webkit-details-marker { display: none; }
.actions { display: flex; gap: 10px; margin-top: 18px; }
.btn {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 16px;
  font-weight: 700;
  cursor: pointer;
  background: var(--panel-alt);
  color: var(--ink);
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--alta-accent-glow); box-shadow: var(--shadow-glow); }
.btn.primary {
  background: var(--alta-accent-primary);
  color: #FFFFFF;
  border-color: var(--alta-accent-primary);
}
.btn.secondary { background: transparent; color: var(--ink); }

#results {
  padding: 0 4px 28px 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
#results[hidden] { display: none; }
#answer { order: 2; }
.scenario-grid { order: 1; }
.chart-card { order: 3; }
.subgrid { order: 4; }
#results > .panel:not(.chart-card):not(.table-panel) { order: 5; }
.table-panel { order: 6; }

.answer-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border: 2px solid var(--alta-accent-glow);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow-glow), var(--shadow-soft);
}
.answer-card h2 { margin: 0; font-size: 28px; font-weight: 700; }
.answer-card p { margin: 6px 0 0; color: var(--muted); font-size: 12.5px; line-height: 1.45; }
.answer-total {
  flex: none;
  text-align: right;
  font-size: 30px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.02em;
}
.answer-total span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}
.scenario-card {
  position: relative;
  overflow: hidden;
  min-height: 112px;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--onprem);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}
.scenario-card::before { content: none; }
.scenario-card:nth-child(1) { border-top-color: var(--onprem); }
.scenario-card:nth-child(2) { border-top-color: var(--cloud); }
.scenario-card:nth-child(3) { border-top-color: var(--hybrid); }
.scenario-card.winner { border-color: var(--alta-accent-glow); box-shadow: var(--shadow-glow), var(--shadow-soft); }
.scenario-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
}
.scenario-top h3 {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.25;
}
.scenario-top span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
}
.tco-metric { margin-top: 4px; }
.tco-metric span { display: none; }
.tco-metric strong {
  display: block;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.02em;
}
.scenario-card:nth-child(1) .tco-metric:nth-of-type(2) strong { color: var(--onprem); }
.scenario-card:nth-child(2) .tco-metric:nth-of-type(2) strong { color: var(--cloud); }
.scenario-card:nth-child(3) .tco-metric:nth-of-type(2) strong { color: var(--hybrid); }
.scenario-card .tco-metric:nth-of-type(n+3),
.tco-metric em,
.scenario-card p { display: none; }

.chart-card {
  margin: 0;
  padding: 18px 18px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.chart-card h3 {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.chart svg { width: 100%; height: auto; filter: none; }
.chart path { stroke-width: 2.5; }
.chart line { stroke: var(--line); }
.chart text { fill: var(--muted); font-size: 11px; }
.chart-legend { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 8px; }
.chart-legend span { display: flex; gap: 7px; align-items: center; color: var(--muted); font-size: 11px; }
.chart-legend i { width: 9px; height: 9px; border-radius: 3px; }

.subgrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 0;
}
.warnings { margin: 0; padding-left: 18px; color: var(--warning); }
.bucket-card {
  display: grid;
  gap: 7px;
  padding: 13px;
  border-radius: 12px;
  background: var(--panel-alt);
  border: 1px solid var(--line);
  margin-bottom: 10px;
}
.bucket-card h4 { margin: 0; font-size: 14px; }
.bucket-card span { color: var(--muted); font-size: 12px; line-height: 1.4; }
.bucket-card b { color: var(--ink); }
.table-panel { margin: 0; }
.export-row { display: flex; gap: 10px; justify-content: flex-end; margin-bottom: 12px; }
.table-wrap { overflow: auto; margin-bottom: 20px; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; min-width: 760px; background: var(--panel); }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; font-size: 12px; }
th { color: var(--muted); background: var(--panel-alt); font-weight: 700; }
td { color: var(--ink); }
.footer {
  display: flex;
  justify-content: space-between;
  padding: 18px 26px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
}

@media (max-width: 1020px) {
  .shell { width: 100%; }
  .grid, .subgrid { grid-template-columns: 1fr; padding-right: 0; }
  aside.panel { position: static; border-right: 0; border-bottom: 1px solid var(--line); border-radius: 0; min-height: auto; }
  #results { padding: 18px 16px 28px; }
  .scenario-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .topbar, .hero, #results, aside.panel, .footer { padding-left: 16px; padding-right: 16px; }
  .hero { display: block; }
  .hero-stat { margin-top: 12px; flex-wrap: wrap; }
  label { grid-template-columns: 1fr; }
  label small { grid-column: 1; margin-top: 0; }
  .answer-card { display: block; }
  .answer-total { text-align: left; margin-top: 12px; }
  .actions, .export-row { flex-wrap: wrap; }
  .btn { flex: 1; }
}


@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}