/* ── Reset & base ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }

/* ── Design tokens ──────────────────────────────── */
:root {
  --blue:    #60a5fa; --blue-bg:  rgba(37,99,235,0.15); --blue-bd:  rgba(96,165,250,0.30);
  --amber:   #fbbf24; --amber-bg: rgba(180,83,9,0.15);  --amber-bd: rgba(251,191,36,0.30);
  --red:     #f87171; --red-bg:   rgba(185,28,28,0.15); --red-bd:   rgba(248,113,113,0.30);
  --green:   #4ade80; --green-bg: rgba(21,128,61,0.15); --green-bd: rgba(74,222,128,0.30);

  --bg:      #0f172a;
  --surface: #1e293b;
  --border:  #334155;
  --text:    #f1f5f9;
  --muted:   #94a3b8;
  --subtle:  #475569;

  --radius:   12px;
  --shadow:   0 1px 3px rgba(0,0,0,.2), 0 1px 2px rgba(0,0,0,.15);
  --shadow-hover: 0 4px 12px rgba(0,0,0,.35);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;

  --header-h: 56px;
  --sidebar-w: 192px;
}

/* ── Base ─────────────────────────────────────────── */
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

body.sidebar-lock { overflow: hidden; }

/* ── Header ──────────────────────────────────────── */
header {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 1rem;
  box-shadow: var(--shadow);
  height: var(--header-h);
}
.header-inner {
  max-width: 1120px; margin: 0 auto;
  display: flex; align-items: center; gap: .75rem;
  height: 100%;
}
.logo {
  display: flex; align-items: center; gap: .5rem;
  font-weight: 700; font-size: 1.05rem; color: var(--text);
  text-decoration: none; white-space: nowrap; flex-shrink: 0;
}
.logo .logo-icon { color: var(--blue); font-size: 1.3rem; }

/* Search in header */
.header-search {
  flex: 1; min-width: 0; max-width: 520px; position: relative;
}
.header-search .ti {
  position: absolute; left: .7rem; top: 50%; transform: translateY(-50%);
  color: var(--subtle); font-size: .95rem; pointer-events: none;
}
#searchInput {
  width: 100%; padding: .42rem .75rem .42rem 2.1rem;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: .88rem;
  outline: none; transition: border-color .15s, box-shadow .15s;
}
#searchInput:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
#searchInput::placeholder { color: var(--subtle); }

/* Filter toggle button — mobile only */
.filter-toggle {
  display: none;
  align-items: center; justify-content: center;
  position: relative;
  background: none;
  border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; color: var(--muted);
  padding: .4rem .55rem; font-size: 1.05rem; flex-shrink: 0;
  transition: background .15s, color .15s, border-color .15s;
}
.filter-toggle:hover { background: var(--border); color: var(--text); }

.filter-badge {
  position: absolute; top: -5px; right: -5px;
  background: var(--blue); color: #fff;
  font-size: .6rem; font-weight: 700;
  min-width: 17px; height: 17px;
  border-radius: 99px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 3px; line-height: 1;
  border: 2px solid var(--surface);
}
.filter-badge.hidden { display: none; }

/* ── Page layout ─────────────────────────────────── */
.layout {
  display: flex;
  align-items: flex-start;
  max-width: 1120px;
  margin: 0 auto;
}

/* ── Sidebar ─────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

.sidebar-inner {
  padding: 1.2rem .85rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Mobile-only sidebar header */
.sidebar-head { display: none; }

/* ── Filter sections ─────────────────────────────── */
.filter-section {
  display: flex;
  flex-direction: column;
  gap: .2rem;
}

.filter-label {
  font-size: .67rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--subtle);
  padding: 0 .5rem;
  margin-bottom: .25rem;
}

/* Sidebar pill → full-width option buttons */
.sidebar .filter-group {
  display: flex;
  flex-direction: column;
  gap: .05rem;
}

.sidebar .pill {
  display: flex; align-items: center;
  border: none; border-radius: 6px;
  background: none; width: 100%; text-align: left;
  padding: .38rem .55rem;
  font-size: .86rem; font-weight: 500;
  color: var(--muted); cursor: pointer;
  transition: background .15s, color .15s;
  user-select: none;
}
.sidebar .pill:hover { background: var(--border); color: var(--text); }
.sidebar .pill.active { background: var(--blue-bg); color: var(--blue); font-weight: 600; }

/* Section-specific active colours */
.sidebar .pill.active.sec-models   { background: var(--blue-bg);  color: var(--blue); }
.sidebar .pill.active.sec-industry { background: var(--amber-bg); color: var(--amber); }
.sidebar .pill.active.sec-semafor  { background: var(--red-bg);   color: var(--red); }
.sidebar .pill.active.sec-tips     { background: var(--green-bg); color: var(--green); }
/* Period always blue */
.sidebar .filter-group.period .pill.active { background: var(--blue-bg); color: var(--blue); }

/* ── Date nav (inside sidebar TIME section) ──────── */
.date-nav {
  display: flex; align-items: center; gap: .2rem;
  margin-top: .4rem;
  padding: .25rem .3rem;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
}
.date-nav.hidden { display: none; }

.date-btn {
  background: none; border: none; cursor: pointer;
  color: var(--muted); padding: .28rem .35rem; border-radius: 5px;
  display: flex; align-items: center; font-size: .9rem; flex-shrink: 0;
  transition: background .15s, color .15s;
}
.date-btn:hover { background: var(--border); color: var(--text); }
.date-btn:disabled { opacity: .35; cursor: default; }

.date-label {
  font-size: .79rem; font-weight: 600; color: var(--text);
  flex: 1; text-align: center; cursor: pointer;
  padding: .2rem .25rem; border-radius: 5px;
  transition: background .15s;
}
.date-label:hover { background: var(--border); }

/* ── Read-state footer ───────────────────────────── */
.read-footer { margin-top: auto; padding-top: .5rem; border-top: 1px solid var(--border); }

.clear-read-btn {
  display: flex; align-items: center; gap: .45rem;
  width: 100%; padding: .38rem .55rem;
  border: none; border-radius: 6px; background: none;
  cursor: pointer; font-size: .83rem; color: var(--muted);
  transition: background .15s, color .15s; text-align: left;
}
.clear-read-btn:hover { background: var(--border); color: var(--text); }
.clear-read-btn:disabled { opacity: .4; cursor: default; }

/* ── Mobile overlay ──────────────────────────────── */
.sidebar-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.45); z-index: 199;
}
.sidebar-overlay.visible { display: block; }

/* ── Main content ────────────────────────────────── */
.main-content { flex: 1; min-width: 0; padding-bottom: 4rem; }

/* ── Result bar ──────────────────────────────────── */
.result-bar {
  padding: .55rem 1rem .35rem;
  font-size: .8rem; color: var(--muted);
  display: flex; align-items: center; gap: .5rem;
}

/* ── Date group headers ──────────────────────────── */
.date-group-header {
  grid-column: 1 / -1;
  display: flex; align-items: center; gap: .5rem;
  padding: .75rem 0 .4rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: .1rem;
}
.date-group-header:first-child { padding-top: .1rem; }

.date-group-center {
  flex: 1;
  display: flex; align-items: baseline; gap: .65rem;
}
.date-group-label { font-size: .92rem; font-weight: 700; color: var(--text); }
.date-group-count { font-size: .76rem; color: var(--muted); }

.dg-nav-btn {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; flex-shrink: 0;
  background: none; border: 1px solid var(--border); border-radius: 6px;
  color: var(--muted); cursor: pointer; font-size: .85rem;
  transition: background .15s, color .15s, border-color .15s;
}
.dg-nav-btn:hover:not(:disabled) { background: var(--border); color: var(--text); border-color: var(--subtle); }
.dg-nav-btn:disabled { opacity: .25; cursor: default; }

/* ── Cards grid ──────────────────────────────────── */
#cardGrid {
  padding: 0 1rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

/* ── Card ────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex; overflow: hidden;
  transition: box-shadow .2s, transform .2s, opacity .3s;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }

.card.card-read { opacity: .5; }
.card.card-read:hover { opacity: .85; }

/* accent strip */
.card-accent { width: 4px; flex-shrink: 0; }
.ca-m { background: var(--blue); }
.ca-i { background: var(--amber); }
.ca-s { background: var(--red); }
.ca-t { background: var(--green); }

.card-body {
  flex: 1; padding: 1rem;
  display: flex; flex-direction: column; gap: .55rem;
}

/* section badge */
.card-badge {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .72rem; font-weight: 600; letter-spacing: .03em;
  text-transform: uppercase; padding: .2rem .5rem;
  border-radius: 4px; align-self: flex-start;
}
.badge-m { color: var(--blue);  background: var(--blue-bg); }
.badge-i { color: var(--amber); background: var(--amber-bg); }
.badge-s { color: var(--red);   background: var(--red-bg); }
.badge-t { color: var(--green); background: var(--green-bg); }

.card-headline { font-size: 1rem; font-weight: 700; line-height: 1.35; color: var(--text); }
.card-summary  { font-size: .88rem; line-height: 1.55; color: var(--muted); }

/* for you */
.card-foryou {
  display: flex; gap: .45rem; align-items: flex-start;
  background: var(--blue-bg); border: 1px solid var(--blue-bd);
  border-radius: 8px; padding: .55rem .7rem;
  font-size: .84rem; line-height: 1.5; color: var(--text);
}
.ca-t + .card-body .card-foryou { background: var(--green-bg); border-color: var(--green-bd); }
.foryou-label {
  font-size: .72rem; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; color: var(--blue);
  white-space: nowrap; margin-top: .1rem;
}
.ca-t + .card-body .foryou-label { color: var(--green); }

/* specs */
details.specs {
  border: 1px solid var(--border); border-radius: 8px;
  font-size: .84rem; overflow: hidden;
}
details.specs summary {
  display: flex; align-items: center; gap: .4rem;
  padding: .5rem .7rem; cursor: pointer; list-style: none;
  color: var(--muted); user-select: none; transition: background .15s;
}
details.specs summary::-webkit-details-marker { display: none; }
details.specs summary:hover { background: var(--border); }
details.specs summary .ti-chevron-down { margin-left: auto; transition: transform .2s; }
details.specs[open] summary .ti-chevron-down { transform: rotate(180deg); }
.specs-grid { padding: .5rem .7rem .65rem; display: grid; gap: .3rem; }
.spec-row {
  display: flex; justify-content: space-between; gap: 1rem;
  font-size: .82rem; padding: .2rem 0;
  border-bottom: 1px solid var(--border);
}
.spec-row:last-child { border-bottom: none; }
.spec-label { color: var(--muted); }
.spec-value { font-weight: 600; color: var(--text); text-align: right; }
.spec-value em { font-style: normal; color: var(--blue); }

/* card footer */
.card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: auto; padding-top: .4rem;
  border-top: 1px solid var(--border);
}
.src-tag {
  font-size: .76rem; color: var(--subtle);
  display: flex; align-items: center; gap: .4rem; flex-wrap: wrap;
}
.source-pill {
  display: inline-flex; align-items: center; gap: .2rem;
  font-size: .7rem; font-weight: 600; letter-spacing: .03em;
  padding: .15rem .45rem; border-radius: 99px;
  border: 1px solid; white-space: nowrap;
}
.source-pill.src-tldr    { color: #38bdf8; background: rgba(3,105,161,.18);  border-color: rgba(56,189,248,.30); }
.source-pill.src-semafor { color: #a78bfa; background: rgba(124,58,237,.18); border-color: rgba(167,139,250,.30); }
.source-pill.src-web     { color: #9ca3af; background: rgba(55,65,81,.25);   border-color: rgba(156,163,175,.25); }
.card-link {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .8rem; font-weight: 600; color: var(--blue);
  text-decoration: none; padding: .3rem .6rem;
  border-radius: 6px; transition: background .15s;
}
.card-link:hover { background: var(--blue-bg); }

/* ── Load more ───────────────────────────────────── */
.load-more-wrap {
  grid-column: 1 / -1;
  display: flex; justify-content: center;
  padding: 1.5rem 0 .5rem;
}
.load-more-btn {
  display: inline-flex; align-items: center; gap: .6rem;
  padding: .65rem 1.4rem;
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 8px; cursor: pointer;
  font-size: .88rem; font-weight: 600; color: var(--text);
  transition: border-color .15s, background .15s, box-shadow .15s;
}
.load-more-btn:hover {
  border-color: var(--blue); background: var(--blue-bg);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.load-more-count { font-size: .78rem; font-weight: 500; color: var(--muted); }

/* ── Empty / loading states ──────────────────────── */
.state-msg {
  grid-column: 1 / -1;
  text-align: center; padding: 4rem 1rem; color: var(--muted);
}
.state-msg .ti { font-size: 2.5rem; display: block; margin-bottom: .75rem; color: var(--subtle); }
.state-msg strong { display: block; font-size: 1.05rem; margin-bottom: .35rem; color: var(--text); }
.state-msg p { font-size: .9rem; }

.spinner {
  width: 36px; height: 36px; margin: 0 auto 1rem;
  border: 3px solid var(--border); border-top-color: var(--blue);
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Search highlight ────────────────────────────── */
mark {
  background: rgba(96,165,250,.25);
  color: inherit; border-radius: 2px; padding: 0 .1em;
}

/* ── Responsive — mobile (<768px) ────────────────── */
@media (max-width: 767px) {
  /* Show filter toggle button */
  .filter-toggle { display: flex; }

  /* Hide logo text */
  .logo span { display: none; }

  /* Search takes remaining width */
  .header-search { max-width: none; }

  /* Stack layout */
  .layout { display: block; }

  .main-content { padding-bottom: 2rem; }

  /* Sidebar → bottom sheet */
  .sidebar {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    width: 100%; height: auto; max-height: 82vh;
    border-right: none;
    border-top: 1px solid var(--border);
    border-radius: 16px 16px 0 0;
    transform: translateY(105%);
    transition: transform .3s cubic-bezier(.32,.72,0,1);
    z-index: 200;
    box-shadow: 0 -4px 32px rgba(0,0,0,.15);
    top: auto; /* override sticky top */
  }

  .sidebar.open { transform: translateY(0); }

  /* Show mobile header inside sheet */
  .sidebar-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: .85rem 1rem .7rem;
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 1;
    background: var(--surface);
  }
  .sidebar-title { font-size: .95rem; font-weight: 700; color: var(--text); }
  .sidebar-close {
    background: none; border: none; cursor: pointer; color: var(--muted);
    padding: .3rem; border-radius: 6px; display: flex; align-items: center;
    font-size: 1.1rem; transition: background .15s, color .15s;
  }
  .sidebar-close:hover { background: var(--border); color: var(--text); }

  .sidebar-inner { padding: .8rem 1rem 1.75rem; gap: 1.2rem; }

  /* On mobile: filter groups are horizontal pills */
  .sidebar .filter-group {
    flex-direction: row;
    flex-wrap: wrap;
    gap: .3rem;
  }
  .sidebar .pill {
    width: auto;
    border: 1px solid var(--border); border-radius: 99px;
    background: var(--surface); color: var(--muted);
    padding: .3rem .75rem; font-size: .82rem;
  }
  .sidebar .pill:hover { background: var(--surface); border-color: var(--blue); color: var(--blue); }
  .sidebar .pill.active                       { background: var(--blue);  border-color: var(--blue);  color: var(--bg); }
  .sidebar .pill.active.sec-models            { background: var(--blue);  border-color: var(--blue);  color: var(--bg); }
  .sidebar .pill.active.sec-industry          { background: var(--amber); border-color: var(--amber); color: var(--bg); }
  .sidebar .pill.active.sec-tips              { background: var(--green); border-color: var(--green); color: var(--bg); }
  .sidebar .filter-group.period .pill.active  { background: var(--blue);  border-color: var(--blue);  color: var(--bg); }

  /* Date nav on mobile sheet */
  .date-nav { margin-top: .4rem; }

  /* Card grid: 1 column */
  #cardGrid { grid-template-columns: 1fr; }
}

/* ── Responsive — narrow desktop (768–1000px) ─────── */
@media (min-width: 768px) and (max-width: 1000px) {
  #cardGrid { grid-template-columns: 1fr; }
}