/* ============================================================
   ravennacalc.com — Bandwidth Calculator Styles
   ============================================================ */

/* ----- CSS Variables ----- */
:root {
  --bg:           #f0ece0;   /* warm parchment */
  --surface:      #ffffff;
  --border:       #d8d2c2;
  --border-inner: #ebe6d8;
  --header-bg:    #2c1a08;   /* dark chocolate brown — logo text colour */
  --footer-bg:    #2c1a08;

  --primary:      #7a8c20;   /* olive green — logo arc colour */
  --primary-hover:#5e6c18;
  --primary-light:#edf0d6;   /* pale olive tint */

  --text:         #261608;   /* very dark warm brown */
  --text-muted:   #6b5838;
  --text-faint:   #9a8a6a;

  --shadow:       0 1px 3px rgba(44,26,8,0.07), 0 6px 24px rgba(44,26,8,0.08);
  --radius:       12px;
  --radius-sm:    8px;
  --radius-xs:    6px;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

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

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ----- Layout Container ----- */
.container {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  background: var(--header-bg);
  padding: 22px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.brand {
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand-logo {
  height: 52px;
  width: auto;
  display: block;
  border-radius: 4px;
}

.brand-tagline {
  font-size: 20px;
  color: #ffffff;
  font-weight: 700;
  letter-spacing: -0.2px;
}

/* ============================================================
   Main
   ============================================================ */
.main-content {
  flex: 1;
  padding: 36px 0 52px;
}

/* ============================================================
   Intro
   ============================================================ */
.intro {
  font-size: 16px;
  color: var(--text);
  font-weight: 400;
  line-height: 1.8;
  margin-bottom: 28px;
}

/* ============================================================
   Quick Presets
   ============================================================ */
.presets-section {
  margin-bottom: 28px;
}

.presets-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}

.presets-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.presets-subtitle {
  font-size: 11px;
  color: var(--text-faint);
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-btn {
  padding: 7px 20px;
  border-radius: var(--radius-xs);
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.14s, color 0.14s, background 0.14s, box-shadow 0.14s;
  letter-spacing: 0.01em;
  user-select: none;
}

.preset-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.preset-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(122,140,32,0.35);
}

/* ============================================================
   Calculator Layout
   ============================================================ */
.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: stretch;
}

@media (max-width: 800px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   Card
   ============================================================ */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 26px 28px;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-inner);
}

.card-title svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* ============================================================
   Config Card — Form Elements
   ============================================================ */
.form-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
  margin-bottom: 16px;
}

.form-field {
  margin-bottom: 0;
}

.form-field--full {
  grid-column: 1 / -1;
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}

.form-input,
.form-select {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 14.5px;
  color: var(--text);
  background: #faf8f3;
  outline: none;
  transition: border-color 0.14s, box-shadow 0.14s, background 0.14s;
  -webkit-appearance: none;
  appearance: none;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(122,140,32,0.12);
}

/* Custom select arrow */
.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

/* Config note */
.config-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 6px;
  padding: 9px 12px;
  background: #f5f0e4;
  border: 1px solid var(--border-inner);
  border-radius: var(--radius-xs);
  font-size: 11.5px;
  color: var(--text-faint);
  font-family: 'SFMono-Regular', 'Menlo', 'Consolas', monospace;
  line-height: 1.4;
}

.config-note svg {
  flex-shrink: 0;
  color: var(--text-faint);
  margin-top: 1px;
}

/* ============================================================
   Results Card
   ============================================================ */

/* Primary result blocks: Per Stream / Total */
.result-primary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 16px;
}

.result-block {
  padding: 18px 20px;
}

.result-block:first-child {
  border-right: 1px solid var(--border);
}

.result-block--highlight {
  background: var(--primary-light);
}

.result-block-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-faint);
  margin-bottom: 8px;
}

.result-block--highlight .result-block-label {
  color: #8a9e30;
}

.result-block-value {
  font-size: 27px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -0.5px;
}

.result-value-total {
  color: var(--primary);
}

.bw-val {
  font-variant-numeric: tabular-nums;
}

.bw-unit {
  font-size: 14px;
  font-weight: 500;
  opacity: 0.6;
}

.result-block-sub {
  font-size: 12px;
  color: var(--text-faint);
  margin-top: 5px;
  min-height: 18px;
  font-variant-numeric: tabular-nums;
}

/* Stats 2×2 grid */
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.result-stat {
  padding: 13px 16px;
  background: var(--surface);
}

.result-stat:nth-child(1),
.result-stat:nth-child(2) {
  border-bottom: 1px solid var(--border-inner);
}

.result-stat:nth-child(1),
.result-stat:nth-child(3) {
  border-right: 1px solid var(--border-inner);
}

.result-stat-label {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-faint);
  margin-bottom: 5px;
}

.result-stat-value {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   Multicast Note
   ============================================================ */
.multicast-note {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-top: 20px;
  padding: 16px 20px;
  background: var(--primary-light);
  border: 1px solid #c8d47a;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.7;
}

.multicast-note svg {
  flex-shrink: 0;
  color: var(--primary);
  margin-top: 4px;
}

.multicast-note strong {
  color: var(--text);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--footer-bg);
  padding: 16px 0;
  margin-top: auto;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.site-footer p {
  font-size: 12px;
  color: #c8b898;
  text-align: center;
  line-height: 1.8;
}

.footer-copy {
  font-size: 11px;
  color: #8a7858;
}

.footer-disclaimer {
  font-size: 11px;
  color: #5a4a38;
  line-height: 1.7;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.footer-link {
  color: #8a7858;
  text-decoration: none;
  transition: color 0.15s;
}

.footer-link:hover {
  color: #ffffff;
}

.footer-link--icon {
  display: inline-flex;
  align-items: center;
}

.footer-icons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }

  .main-content {
    padding: 24px 0 40px;
  }

  .card {
    padding: 20px;
  }

  .preset-btn {
    padding: 6px 14px;
    font-size: 13px;
  }

  .result-primary {
    grid-template-columns: 1fr;
  }

  .result-block:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .result-block-value {
    font-size: 24px;
  }
}