/* ================================================================
   ISL Quarterly Report — Editorial design system
   Shared between /index.html (Social Media) and /web/index.html (Website).
   ================================================================ */

:root {
  /* Editorial palette */
  --paper: #ffffff;
  --paper-2: #f5f5f3;
  --ink: #14110d;
  --ink-2: #2a2622;
  --ink-3: #6a655d;
  --ink-4: #a39d92;
  --rule: rgba(20, 17, 13, 0.14);
  --rule-soft: rgba(20, 17, 13, 0.08);

  --isl-blue: #0a4d8c;
  --up: #1a6a3c;
  --down: #9a2820;
  --flat: #6a655d;

  /* type */
  --serif: "Instrument Serif", "Newsreader", "Times New Roman", Georgia, serif;
  --sans: "Inter Tight", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;

  /* rhythm */
  --col: 1180px;
  --gap: 28px;
  --pad-y: 88px;
}

body[data-density="airy"]     { --pad-y: 120px; --gap: 36px; }
body[data-density="balanced"] { --pad-y: 88px;  --gap: 28px; }
body[data-density="tight"]    { --pad-y: 56px;  --gap: 20px; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--paper); color: var(--ink); }
body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }

.serif { font-family: var(--serif); font-weight: 400; letter-spacing: -0.005em; }
.ital  { font-style: italic; }
.num   { font-variant-numeric: tabular-nums lining-nums; }
.upper { text-transform: uppercase; letter-spacing: 0.14em; font-size: 11px; font-weight: 500; color: var(--ink-3); }

.wrap { max-width: var(--col); margin: 0 auto; padding: 0 32px; }

/* ============= MASTHEAD ============= */
.masthead {
  border-top: 4px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-top: 16px;
  padding-bottom: 14px;
  background: var(--paper);
}
.masthead-row { display: flex; align-items: baseline; justify-content: space-between; gap: 32px; }
.masthead-left { display: flex; align-items: baseline; gap: 18px; min-width: 0; }
.masthead-mark { font-family: var(--serif); font-size: 28px; line-height: 1; letter-spacing: -0.02em; }
.masthead-mark em { font-style: italic; color: var(--isl-blue); }
.masthead-sub {
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3);
  border-left: 1px solid var(--rule); padding-left: 18px;
}
.masthead-right { display: flex; align-items: baseline; gap: 22px; font-size: 12px; color: var(--ink-3); }
.masthead-right .issue { color: var(--ink); font-family: var(--serif); font-size: 16px; }

.masthead-nav {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(8px);
}
.masthead-nav-row {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 12px 0;
  font-size: 13px;
}
.nav-tabs { display: flex; gap: 28px; }
.nav-tabs a {
  color: var(--ink-3); position: relative; padding: 4px 0;
  transition: color .15s ease;
}
.nav-tabs a:hover { color: var(--ink); }
.nav-tabs a.is-active { color: var(--ink); }
.nav-tabs a.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -13px; height: 2px; background: var(--ink);
}
.nav-meta { display: flex; gap: 18px; align-items: center; color: var(--ink-3); }
.qchooser {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--ink); cursor: pointer;
  border: 1px solid var(--rule); padding: 6px 12px; border-radius: 2px;
  background: var(--paper);
  transition: border-color .15s ease;
}
.qchooser:hover { border-color: var(--ink); }
.qchooser .caret { font-size: 10px; opacity: .6; }

/* ============= HERO ============= */
.hero { padding: var(--pad-y) 0 64px; border-bottom: 1px solid var(--rule); }
.hero-kicker { font-size: 12px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 28px; }
.hero-title {
  font-family: var(--serif);
  font-size: clamp(64px, 9vw, 132px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 36px;
  color: var(--ink);
}
.hero-title em { font-style: italic; color: var(--isl-blue); font-weight: 400; }

.hero-lede-row {
  display: grid; grid-template-columns: 1fr 2fr; gap: var(--gap);
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}
.hero-lede-meta { display: flex; flex-direction: column; gap: 14px; }
.meta-pair { display: flex; flex-direction: column; gap: 4px; }
.meta-pair .label { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-4); }
.meta-pair .value { font-family: var(--serif); font-size: 19px; }

.hero-lede {
  font-family: var(--serif);
  font-size: 24px;
  line-height: 1.4;
  color: var(--ink-2);
  text-wrap: pretty;
}
.hero-lede em { color: var(--isl-blue); font-style: italic; }

/* ============= SECTION CHROME ============= */
.section { padding: var(--pad-y) 0; border-bottom: 1px solid var(--rule); }
.section:last-child { border-bottom: 0; }

.section-head { display: block; margin-bottom: 40px; }
.section-eyebrow { display: none; }
.section-desc { display: none; }
.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.section-title em { font-style: italic; color: var(--isl-blue); }

/* ============= KPI BLOCK ============= */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: 36px;
  row-gap: 56px;
}
body[data-layout="apple"]    .kpi-grid { grid-template-columns: repeat(2, 1fr); column-gap: 80px; row-gap: 80px; }
body[data-layout="document"] .kpi-grid { grid-template-columns: repeat(4, 1fr); column-gap: 24px; row-gap: 36px; }

.kpi {
  display: flex; flex-direction: column; gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--ink);
  position: relative;
}
.kpi-label { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.kpi-value {
  font-family: var(--serif);
  font-size: clamp(42px, 4.6vw, 64px);
  line-height: 1;
  letter-spacing: -0.025em;
  color: var(--ink);
  font-variant-numeric: tabular-nums lining-nums;
}
body[data-layout="apple"] .kpi-value { font-size: clamp(72px, 8vw, 110px); }
.kpi-value .sm { font-size: 0.6em; color: var(--ink-3); margin-left: 4px; }
.kpi-foot { display: flex; align-items: baseline; gap: 10px; font-size: 13px; color: var(--ink-3); }
.delta { display: inline-flex; align-items: baseline; gap: 6px; font-weight: 500; font-variant-numeric: tabular-nums; }
.delta .arrow { font-family: var(--serif); font-style: italic; font-size: 1.1em; line-height: 1; }
.delta.up   { color: var(--up); }
.delta.down { color: var(--down); }
.delta.flat { color: var(--flat); }
.delta-note { color: var(--ink-4); font-size: 12px; }

/* ============= TREND CHART ============= */
.trend-body { display: grid; grid-template-columns: 1fr; gap: 24px; }
.trend-chart { width: 100%; height: 320px; display: block; }
.trend-legend {
  display: flex; gap: 28px; align-items: baseline;
  padding-top: 16px; border-top: 1px solid var(--rule);
  font-size: 13px;
}
.legend-item { display: flex; align-items: baseline; gap: 8px; color: var(--ink-3); cursor: pointer; }
.legend-item .swatch { width: 18px; height: 2px; display: inline-block; transform: translateY(-3px); }
.legend-item.is-off { opacity: 0.35; }
.legend-item .v { font-family: var(--serif); font-size: 18px; color: var(--ink); margin-left: 4px; }

/* ============= CHANNELS / PLATFORMS / PAGES (shared row layout) ============= */
.channels { display: grid; gap: 0; }
.channel-row {
  display: grid;
  grid-template-columns: 0.4fr 1.4fr repeat(5, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 32px 0;
  border-top: 1px solid var(--rule);
}
.channel-row:last-child { border-bottom: 1px solid var(--rule); }
body[data-density="tight"] .channel-row { padding: 18px 0; }

.channel-row.is-head { padding: 12px 0; border-top: 0; border-bottom: 1px solid var(--ink); }
.channel-row.is-head > div { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.channel-row.is-head .col-num { text-align: right; }

.channel-idx { font-family: var(--serif); font-style: italic; font-size: 22px; color: var(--isl-blue); }
.channel-name { font-family: var(--serif); font-size: 22px; line-height: 1.2; color: var(--ink); }
.channel-note { font-size: 12px; color: var(--ink-3); margin-top: 4px; font-style: italic; max-width: 36ch; line-height: 1.4; font-family: var(--serif); }
.col-num { text-align: right; font-variant-numeric: tabular-nums lining-nums; }
.col-num .big { font-family: var(--serif); font-size: 22px; color: var(--ink); display: block; }
.col-num .sub { font-size: 11px; color: var(--ink-4); }

/* 4-col variant for website channels (Channel · Sessions · Engagement rate · Trend) */
.channel-row.cols-4 { grid-template-columns: 0.4fr 1.4fr repeat(3, 1fr); }

/* ============= TOP POSTS / PAGES TABLE ============= */
.table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.table thead th {
  text-align: left;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); font-weight: 500;
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--ink);
  white-space: nowrap;
}
.table thead th.r { text-align: right; padding-right: 0; }
.table tbody td {
  padding: 24px 16px 24px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: baseline;
  font-size: 14px;
}
body[data-density="tight"] .table tbody td { padding: 14px 16px 14px 0; }
.table tbody td.r { text-align: right; padding-right: 0; font-family: var(--serif); font-size: 19px; color: var(--ink); }
.table tbody td.r .sub { font-size: 11px; color: var(--ink-4); font-family: var(--sans); display: block; margin-top: 2px; }
.table .campaign-name { font-family: var(--serif); font-size: 20px; color: var(--ink); line-height: 1.25; }
.table .campaign-chan { font-size: 12px; color: var(--ink-3); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.12em; }
.flag {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: transparent;
  margin-right: 10px; vertical-align: middle;
}
.flag.best { background: var(--up); }
.flag.weak { background: var(--down); }

/* ============= NOTES (insights) ============= */
.notes { display: grid; grid-template-columns: 1fr 1fr; gap: 64px 80px; }
body[data-layout="document"] .notes { grid-template-columns: repeat(4, 1fr); gap: 32px; }
.note h4 {
  font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-3); font-weight: 500;
  margin-bottom: 22px;
  display: flex; align-items: baseline; gap: 12px;
}
.note h4 em { font-family: var(--serif); font-style: italic; font-size: 16px; color: var(--isl-blue); letter-spacing: 0; text-transform: none; }
.note ul { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.note li {
  font-family: var(--serif);
  font-size: 18px; line-height: 1.45;
  color: var(--ink-2);
  padding-left: 20px;
  position: relative;
  text-wrap: pretty;
}
.note li::before {
  content: "—";
  position: absolute; left: 0; top: 0;
  color: var(--ink-4);
  font-family: var(--serif);
}
.note.working li::before { color: var(--up); }
.note.notworking li::before { color: var(--down); }

/* ============= APPLE LAYOUT ============= */
body[data-layout="apple"] .hero-title { font-size: clamp(80px, 12vw, 180px); text-align: center; }
body[data-layout="apple"] .hero-kicker { text-align: center; }
body[data-layout="apple"] .hero-lede-row { grid-template-columns: 1fr; text-align: center; }
body[data-layout="apple"] .hero-lede-meta { flex-direction: row; justify-content: center; gap: 56px; }
body[data-layout="apple"] .hero-lede { font-size: 28px; max-width: 60ch; margin: 0 auto; }
body[data-layout="apple"] .section-head { grid-template-columns: 1fr; text-align: center; }
body[data-layout="apple"] .section-eyebrow { justify-content: center; }
body[data-layout="apple"] .section-desc { margin: 14px auto 0; }
body[data-layout="apple"] .section-title { font-size: clamp(48px, 6vw, 88px); }
body[data-layout="apple"] .channel-row { grid-template-columns: 0.3fr 2fr repeat(3, 1fr); }
body[data-layout="apple"] .channel-row .col-num.hide-apple { display: none; }

/* ============= DOCUMENT LAYOUT ============= */
body[data-layout="document"] .hero { padding: 56px 0 40px; }
body[data-layout="document"] .hero-title { font-size: clamp(48px, 6vw, 78px); }
body[data-layout="document"] .section { padding: 56px 0; }
body[data-layout="document"] .section-head { margin-bottom: 28px; }
body[data-layout="document"] .section-title { font-size: clamp(28px, 3vw, 38px); }
body[data-layout="document"] .kpi-value { font-size: clamp(32px, 3.4vw, 44px); }
body[data-layout="document"] .channel-row { padding: 18px 0; }
body[data-layout="document"] .channel-name { font-size: 17px; }
body[data-layout="document"] .col-num .big { font-size: 17px; }
body[data-layout="document"] .table .campaign-name { font-size: 16px; }
body[data-layout="document"] .table tbody td.r { font-size: 16px; }
body[data-layout="document"] .note li { font-size: 15px; line-height: 1.5; }

/* ============= COLOPHON ============= */
.colophon {
  padding: 80px 0 120px;
  color: var(--ink-3);
  font-size: 13px;
  display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: end;
  border-top: 4px solid var(--ink);
}
.colophon .left { font-family: var(--serif); font-size: 20px; line-height: 1.4; color: var(--ink); max-width: 50ch; }
.colophon .right { text-align: right; }

/* ============= NAV CHOOSER MENU ============= */
.menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--paper); border: 1px solid var(--ink);
  min-width: 220px; padding: 8px 0;
  opacity: 0; visibility: hidden; transform: translateY(-4px);
  transition: opacity .15s ease, transform .15s ease, visibility .15s ease;
  z-index: 100;
}
.menu.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
.menu .group { font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-4); padding: 10px 16px 4px; }
.menu a { display: block; padding: 8px 16px; font-size: 13px; color: var(--ink-2); }
.menu a:hover { background: var(--paper-2); color: var(--ink); }
.menu a.active { color: var(--isl-blue); font-weight: 500; }

/* Platform tabs (Top Posts) */
.platform-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--ink); margin-bottom: 0; }
.platform-tab {
  padding: 14px 28px 14px 0; margin-right: 28px;
  border: 0; background: transparent;
  font-family: var(--serif); font-size: 20px; color: var(--ink-4);
  cursor: pointer; position: relative;
  transition: color .15s ease;
}
.platform-tab:hover { color: var(--ink-2); }
.platform-tab.is-active { color: var(--ink); }
.platform-tab.is-active::after {
  content: ""; position: absolute; left: 0; right: 28px; bottom: -1px; height: 2px; background: var(--isl-blue);
}

/* responsive collapse */
@media (max-width: 880px) {
  .hero-lede-row, .section-head { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .channel-row, .channel-row.cols-4 { grid-template-columns: 1fr 1fr; row-gap: 12px; }
  .notes { grid-template-columns: 1fr; }
}