:root {
  --bg: #f4f6f9;
  --bg-top: #f6f7f9;
  --bg-bottom: #e9eef5;
  --ink: #1f2937;
  --muted: #5f6b7a;
  --panel: #ffffff;
  --border: #d6dee9;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-light: #e0f2f0;
  --new-tag: #0f766e;
  --new-bg: #d1fae5;
  --warn: #d97706;
  --warn-bg: #fef3c7;
  --shadow: 0 12px 30px rgba(21, 31, 52, 0.12);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-top: #0f172a;
    --bg-bottom: #101b33;
    --bg: #1e2d45;
    --ink: #e5e7eb;
    --muted: #9aa7bb;
    --panel: #182033;
    --border: #2c3950;
    --accent: #1ca094;
    --accent-strong: #2dd4bf;
    --accent-light: #0d3d38;
    --new-bg: #064e3b;
    --new-tag: #6ee7b7;
    --warn-bg: #422006;
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
  padding: 20px;
}

.page {
  width: min(960px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.page .hero {
  background: linear-gradient(125deg, var(--accent), var(--accent-strong));
  color: #fff;
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.page .hero h1 {
  margin: 0;
  font-size: 26px;
}

.page .hero p {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.92);
}

.nav {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  text-decoration: none;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 10px;
  padding: 7px 10px;
  font-weight: 700;
}

.nav a:hover {
  background: rgba(255, 255, 255, 0.14);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.panel h3 {
  margin: 16px 0 8px;
  font-size: 16px;
}

.panel p, .panel li {
  color: var(--muted);
  line-height: 1.55;
}

.panel ul {
  margin: 0;
  padding-left: 20px;
}

.note {
  background: rgba(15, 118, 110, 0.1);
  border: 1px solid rgba(15, 118, 110, 0.35);
  border-radius: 12px;
  padding: 10px 12px;
}

a[href^="mailto:"] {
  color: var(--accent-strong);
  font-weight: 700;
}

a[href^="mailto:"]:hover {
  color: var(--accent);
}

footer {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  padding: 8px;
}

/* ════════════════════════════════════
   Index page — How to Use
   ════════════════════════════════════ */

/* Landing page hero — index.html only */
.page .hero.hero-landing {
  padding: 48px 24px 40px;
  text-align: center;
}
.page .hero.hero-landing h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 8px;
}
.page .hero.hero-landing p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.88);
  max-width: 560px;
  margin: 0 auto;
}
.install-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
  padding: 13px 24px;
  background: #fff;
  color: #0f766e;
  font-size: 15px;
  font-weight: 800;
  border-radius: 50px;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(0,0,0,0.18);
  transition: transform 0.15s, box-shadow 0.15s;
}
.install-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.22);
}
.install-btn img { width: 22px; height: 22px; }

/* ── Layout ── */
.content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
}
.toc h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 12px; }
.toc ol  { padding-left: 18px; display: grid; gap: 6px; }
.toc a   { color: var(--accent); text-decoration: none; font-size: 14px; font-weight: 600; }
.toc a:hover { text-decoration: underline; }

/* ── Layout ── */
.content {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  gap: 36px;
}

/* ── Section card ── */
.section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.section-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--accent-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.section-header h2 { font-size: 20px; font-weight: 700; }
.section-header .tag-new {
  font-size: 10px; font-weight: 800;
  background: var(--new-bg); color: var(--new-tag);
  border-radius: 20px; padding: 2px 8px;
  text-transform: uppercase; letter-spacing: .06em;
}
.section-body { padding: 24px; }

/* ── Steps ── */
.steps { display: grid; gap: 16px; margin-top: 4px; }
.step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.step-num {
  width: 26px; height: 26px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 12px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-text strong { display: block; font-size: 15px; margin-bottom: 2px; }
.step-text p { font-size: 13px; color: var(--muted); }

/* ── Feature list ── */
.features { display: grid; gap: 10px; margin-top: 4px; }
.feature {
  display: flex;
  gap: 10px;
  padding: 12px 14px;
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.feature-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }
.feature-body strong { font-size: 14px; display: flex; align-items: center; gap: 6px; }
.feature-body p { font-size: 13px; color: var(--muted); margin-top: 2px; }
.tag-new-inline {
  font-size: 9px; font-weight: 800;
  background: var(--new-bg); color: var(--new-tag);
  border-radius: 20px; padding: 1px 6px;
  text-transform: uppercase;
}

/* ── Mockup: Popup ── */
.mockup-popup {
  width: 300px;
  border-radius: 14px;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  font-size: 12px;
  margin: 20px auto 0;
}
.mp-header {
  background: linear-gradient(130deg, #0f766e, #065f56);
  color: #fff;
  padding: 12px 14px 10px;
}
.mp-header h3 { font-size: 15px; font-weight: 700; }
.mp-header p  { font-size: 11px; opacity: .8; margin-top: 2px; }
.mp-panel {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
}
.mp-row {
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 5px 0;
  font-size: 12px; font-weight: 600;
}
.mp-row + .mp-row { border-top: 1px solid var(--border); }
.mp-toggle {
  width: 32px; height: 18px;
  background: #0f766e;
  border-radius: 18px;
  position: relative;
}
.mp-toggle::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  background: #fff;
  border-radius: 50%;
  top: 2px; right: 2px;
}
.mp-toggle.off { background: #cbd5e1; }
.mp-toggle.off::after { right: auto; left: 2px; }
.mp-configure {
  display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--border);
  padding: 8px 0 2px;
  margin-top: 4px;
}
.mp-configure span { font-size: 11px; color: var(--muted); }
.mp-configure button {
  font-size: 11px; font-weight: 700;
  background: var(--bg); color: var(--ink); border: 1px solid var(--border);
  border-radius: 8px; padding: 4px 8px; cursor: default;
}
.mp-group-list { display: grid; gap: 5px; }
.mp-group-item {
  display: flex; align-items: center; gap: 6px;
  background: linear-gradient(135deg, #39867f, #0d6b63);
  border-radius: 8px; padding: 6px 8px;
  color: #fff; font-weight: 700; font-size: 12px;
}
.swatch {
  width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0;
}
.mp-group-item button {
  margin-left: auto; font-size: 10px; font-weight: 700;
  background: rgba(255,255,255,.22); color: #fff;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 6px; padding: 2px 6px; cursor: default;
}

/* ── Mockup: Options ── */
.mockup-options {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 20px;
  font-size: 12px;
  box-shadow: 0 4px 18px rgba(0,0,0,.08);
}
.mo-hero {
  background: linear-gradient(130deg, #0f766e, #065f56);
  color: #fff;
  padding: 14px 16px;
}
.mo-hero h3 { font-size: 15px; font-weight: 700; }
.mo-panel {
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 14px 16px;
}
.mo-panel h4 { font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 10px; }
.mo-row {
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.mo-row:last-child { border-bottom: none; }
.mo-row select {
  font-size: 11px; padding: 3px 6px;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--border); border-radius: 6px;
}

/* ── Mockup: Custom Rules ── */
.mockup-rules {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 20px;
  font-size: 12px;
  box-shadow: 0 4px 18px rgba(0,0,0,.08);
}
.mr-header {
  background: linear-gradient(130deg, #0f766e, #065f56);
  color: #fff; padding: 12px 16px;
}
.mr-header h3 { font-size: 14px; font-weight: 700; }
.mr-body { background: var(--panel); padding: 14px 16px; }
.mr-rule {
  border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px;
  margin-bottom: 10px;
}
.mr-rule-head {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 8px;
}
.mr-rule-name {
  flex: 1; font-weight: 700; font-size: 13px;
  background: transparent; border: none; color: var(--ink);
}
.mr-group {
  border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px;
  margin-bottom: 6px; background: var(--bg);
}
.mr-group-meta {
  display: flex; align-items: center; gap: 6px; margin-bottom: 6px;
}
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--accent-light); border: 1px solid var(--accent);
  border-radius: 20px; padding: 2px 8px 2px 6px;
  font-size: 11px;
}
.chip .ct { font-size: 9px; font-weight: 800; color: var(--new-tag); text-transform: uppercase; }
.chip-and { font-size: 9px; font-weight: 700; color: var(--muted); text-transform: uppercase; padding: 0 2px; }
.mr-add-row {
  display: flex; gap: 6px; margin-top: 6px; align-items: center;
}
.mr-add-row select, .mr-add-row input {
  font-size: 11px; padding: 3px 6px;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--border); border-radius: 6px;
}
.mr-add-row input { flex: 1; }
.btn-plus {
  width: 22px; height: 22px;
  background: var(--accent-light); color: var(--new-tag);
  border: none; border-radius: 50%;
  font-size: 16px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  cursor: default; line-height: 1;
}

/* ── Tip box ── */
.tip {
  display: flex; gap: 10px;
  background: var(--warn-bg);
  border: 1px solid #fcd34d;
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 16px;
  font-size: 13px;
}
.tip-icon { font-size: 16px; flex-shrink: 0; }

/* ── Table ── */
table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 13px; }
th { text-align: left; padding: 8px 12px; background: var(--bg); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); border-bottom: 1px solid var(--border); }
td { padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
td:first-child { font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: none; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero h1 { font-size: 26px; }
  .mockup-popup { width: 100%; }
}

/* ── Dark mode: residual overrides (no variable equivalent) ── */
@media (prefers-color-scheme: dark) {
  .mp-toggle.off { background: #374357; }
  .tip { border-color: #854d0e; }
}