/* ============================================================
   Think Fast – News Aggregator  |  styles.css
   Dark-first design, mobile-responsive, smooth animations
   ============================================================ */

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

:root {
  --bg:         #0c0e14;
  --bg2:        #13161f;
  --bg3:        #1a1e2a;
  --border:     #1e2535;
  --fg:         #e2e8f0;
  --fg-muted:   #64748b;
  --fg-dim:     #94a3b8;
  --accent:     #3b82f6;
  --accent-glow:#3b82f625;

  --breaking:   #ef4444;
  --high:       #f97316;
  --medium:     #eab308;
  --normal:     #22c55e;

  --radius:     10px;
  --radius-sm:  6px;
  --shadow:     0 2px 12px #00000055;
  --transition: 200ms ease;

  --header-h:   58px;
  --filter-h:   48px;
}

html { font-size: 15px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }


/* ══════════════════════════════════════════════════════════════
   HEADER
   ══════════════════════════════════════════════════════════════ */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.25rem;
  box-shadow: var(--shadow);
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  flex-shrink: 0;
}

.logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--accent);
}

.tagline {
  font-size: .7rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
}

.header-center {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.header-right {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-shrink: 0;
}

/* ── Ticker tape ──────────────────────────────────────────────── */
.ticker-wrap {
  display: flex;
  align-items: center;
  background: #0a0c12;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  height: 32px;
}

.ticker-label {
  flex-shrink: 0;
  background: var(--breaking);
  color: #fff;
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .1em;
  padding: 0 .6rem;
  height: 100%;
  display: flex;
  align-items: center;
}

.ticker-track {
  flex: 1;
  overflow: hidden;
  white-space: nowrap;
}

@keyframes ticker-scroll {
  0%   { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

.ticker-track .ticker-item {
  display: inline-block;
  padding: 0 2rem;
  font-size: .8rem;
  color: var(--fg-dim);
  animation: ticker-scroll 30s linear infinite;
}

/* ── Refresh controls ─────────────────────────────────────────── */
.status-badge {
  font-size: .7rem;
  color: var(--normal);
  display: flex;
  align-items: center;
  gap: .3rem;
}
.status-badge.orange { color: var(--high); }

.refresh-timer {
  font-size: .75rem;
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  gap: .25rem;
}

.btn-refresh {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: .35rem .75rem;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
}
.btn-refresh:hover { opacity: .85; }
.btn-refresh:disabled { opacity: .4; cursor: not-allowed; }
.btn-refresh.spinning { animation: spin .9s linear infinite; }

@keyframes spin { to { transform: rotate(360deg); } }


/* ══════════════════════════════════════════════════════════════
   FILTER BAR
   ══════════════════════════════════════════════════════════════ */
#filter-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 90;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  height: var(--filter-h);
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 0 1.25rem;
}

.filter-scroll {
  display: flex;
  gap: .4rem;
  overflow-x: auto;
  flex: 1;
  scrollbar-width: none;
}
.filter-scroll::-webkit-scrollbar { display: none; }

.filter-btn {
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  border-radius: 999px;
  padding: .25rem .75rem;
  font-size: .75rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition);
  white-space: nowrap;
}
.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.search-wrap { flex-shrink: 0; }

#search-input {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  font-size: .8rem;
  padding: .3rem .65rem;
  width: 180px;
  outline: none;
  transition: border-color var(--transition);
}
#search-input:focus { border-color: var(--accent); }
#search-input::placeholder { color: var(--fg-muted); }


/* ══════════════════════════════════════════════════════════════
   MAIN FEED
   ══════════════════════════════════════════════════════════════ */
#news-feed {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem 1rem 4rem;
}

/* ── Skeleton loader ──────────────────────────────────────────── */
.skeleton-list { display: flex; flex-direction: column; gap: .6rem; }
.skeleton-card {
  background: var(--bg2);
  border-radius: var(--radius);
  height: 62px;
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .5; }
}

/* ── News list ────────────────────────────────────────────────── */
#news-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

/* ── News card ────────────────────────────────────────────────── */
.news-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .75rem 1rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition),
              transform var(--transition);
  outline: none;
  position: relative;
}
.news-card:hover,
.news-card:focus-visible {
  border-color: var(--accent);
  background: var(--bg3);
  transform: translateY(-1px);
}

/* Priority left-border accent */
.news-card[data-priority="breaking"] { border-left: 3px solid var(--breaking); }
.news-card[data-priority="high"]     { border-left: 3px solid var(--high); }
.news-card[data-priority="medium"]   { border-left: 3px solid var(--medium); }
.news-card[data-priority="normal"]   { border-left: 3px solid var(--normal); }

.news-card.is-read { opacity: .55; }

/* ── Summary row (always visible) ────────────────────────────── */
.card-summary-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .35rem;
}

.priority-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
[data-priority="breaking"] .priority-dot { background: var(--breaking); box-shadow: 0 0 6px var(--breaking); }
[data-priority="high"]     .priority-dot { background: var(--high); }
[data-priority="medium"]   .priority-dot { background: var(--medium); }
[data-priority="normal"]   .priority-dot { background: var(--normal); }

.card-source {
  font-size: .7rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .04em;
  flex-shrink: 0;
}

.card-age {
  font-size: .68rem;
  color: var(--fg-muted);
  margin-left: auto;
}

.card-expand-btn {
  background: none;
  border: none;
  color: var(--fg-muted);
  cursor: pointer;
  font-size: .9rem;
  padding: 0 .15rem;
  transition: transform var(--transition), color var(--transition);
  flex-shrink: 0;
}
.card-expand-btn:hover { color: var(--fg); }
.card-expand-btn[aria-expanded="true"] { transform: rotate(90deg); color: var(--accent); }

/* ── Headline (one-liner) ─────────────────────────────────────── */
.card-headline {
  font-size: .92rem;
  font-weight: 500;
  color: var(--fg);
  line-height: 1.45;
}

/* ── Expanded detail ──────────────────────────────────────────── */
.card-detail {
  margin-top: .75rem;
  padding-top: .75rem;
  border-top: 1px solid var(--border);
  animation: fade-in .15s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card-brief {
  font-size: .85rem;
  color: var(--fg-dim);
  line-height: 1.65;
  margin-bottom: .75rem;
}

.card-actions {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
}

.btn-link {
  font-size: .75rem;
  font-weight: 600;
  padding: .3rem .7rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: opacity var(--transition);
}
.btn-link:hover { opacity: .8; }

.btn-original {
  background: #1d4ed820;
  color: var(--accent);
  border: 1px solid #3b82f640;
}
.btn-local {
  background: #16a34a20;
  color: var(--normal);
  border: 1px solid #22c55e40;
}

/* ── Load-more & empty ────────────────────────────────────────── */
#load-more-wrap { text-align: center; margin-top: 1.5rem; }

.btn-load-more {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  padding: .5rem 1.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .85rem;
  transition: border-color var(--transition), color var(--transition);
}
.btn-load-more:hover { border-color: var(--accent); color: var(--accent); }

.empty-msg {
  text-align: center;
  color: var(--fg-muted);
  padding: 4rem 0;
  font-size: .95rem;
}


/* ══════════════════════════════════════════════════════════════
   TOAST NOTIFICATIONS
   ══════════════════════════════════════════════════════════════ */
#toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: .65rem 1.1rem;
  border-radius: var(--radius);
  font-size: .82rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity .25s ease;
  pointer-events: none;
  max-width: 320px;
  z-index: 200;
}
#toast.visible { opacity: 1; }


/* ══════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
  .tagline    { display: none; }
  .status-badge,
  .refresh-timer { display: none; }
  .header-center { display: none; }
  #search-input { width: 130px; }
}

@media (max-width: 400px) {
  #filter-bar { gap: .5rem; padding: 0 .75rem; }
  #news-feed  { padding: 1rem .75rem 3rem; }
}