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

:root {
  --font-body:  'DM Sans', -apple-system, sans-serif;
  --font-mono:  'JetBrains Mono', monospace;

  --bg:         #f7f7f5;
  --bg-card:    #ffffff;
  --bg-nav:     #1a1a2e;
  --text:       #1e1e2e;
  --text-dim:   #6b7280;
  --accent:     #3b82f6;
  --accent-dim: #dbeafe;
  --border:     #e5e7eb;
  --success:    #10b981;
  --danger:     #ef4444;
  --warning:    #f59e0b;

  --radius:     8px;
  --shadow-sm:  0 1px 2px rgba(0,0,0,.05);
  --shadow:     0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --max-w:      1120px;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Top nav ──────────────────────────────────────────── */
.topnav {
  background: var(--bg-nav);
  color: #fff;
  padding: .75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.topnav .brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
  text-decoration: none;
  letter-spacing: -.02em;
}
.topnav .nav-menu { display: contents; }  /* transparent wrapper on desktop */
.topnav .nav-links { display: flex; gap: .25rem; flex: 1; }
.topnav .nav-links a {
  color: rgba(255,255,255,.7);
  padding: .35rem .75rem;
  border-radius: var(--radius);
  font-size: .875rem;
  font-weight: 500;
  transition: background .15s, color .15s;
}
.topnav .nav-links a:hover,
.topnav .nav-links a.active {
  background: rgba(255,255,255,.12);
  color: #fff;
  text-decoration: none;
}
.topnav .user-area {
  font-size: .8rem;
  color: rgba(255,255,255,.6);
  display: flex;
  align-items: center;
  gap: .75rem;
}
.topnav .user-area a { color: rgba(255,255,255,.7); font-size: .8rem; }
.nav-logout-btn {
  background: none;
  border: none;
  color: rgba(255,255,255,.7);
  font-size: .8rem;
  font-family: var(--font-body);
  cursor: pointer;
  padding: 0;
}
.nav-logout-btn:hover { color: #fff; text-decoration: underline; }

/* ── Container ────────────────────────────────────────── */
.container { max-width: var(--max-w); width: 100%; margin: 0 auto; padding: 1.75rem 1.5rem 3rem; flex: 1; }

/* ── Cards ────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

/* ── Headings ─────────────────────────────────────────── */
h1 { font-size: 1.75rem; font-weight: 700; letter-spacing: -.03em; margin-bottom: .5rem; }
h2 { font-size: 1.25rem; font-weight: 600; letter-spacing: -.02em; margin-bottom: .5rem; }
h3 { font-size: 1rem; font-weight: 600; margin-bottom: .35rem; }

.subtitle { color: var(--text-dim); font-size: .875rem; margin-bottom: 1.25rem; }

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 500;
  padding: .5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--bg); text-decoration: none; }
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; filter: brightness(0.85); }
.btn-danger {
  background: #fff;
  color: var(--danger);
  border-color: var(--danger);
}
.btn-danger:hover { background: #fef2f2; }
.btn-sm { padding: .3rem .65rem; font-size: .8rem; }

/* ── Forms ────────────────────────────────────────────── */
.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: .3rem;
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: .55rem .75rem;
  font-family: var(--font-body);
  font-size: .9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  transition: border-color .15s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-group input[type="range"] {
  display: block;
  width: 100%;
  margin: .35rem 0;
  padding: 0;
  border: none;
  background: transparent;
}
.form-help { font-size: .78rem; color: var(--text-dim); margin-top: .2rem; }

/* ── Messages / alerts ────────────────────────────────── */
.alert {
  padding: .65rem 1rem;
  border-radius: var(--radius);
  font-size: .875rem;
  margin-bottom: 1rem;
}
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-warning { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }
.alert-info    { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }

/* ── Stat boxes ───────────────────────────────────────── */
.stats { display: flex; gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.stat-box {
  flex: 1;
  min-width: 140px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}
.stat-box .stat-value { font-size: 1.75rem; font-weight: 700; letter-spacing: -.04em; }
.stat-box .stat-label { font-size: .78rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .04em; }

/* ── Score badge ──────────────────────────────────────── */
.score-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 500;
  padding: .15rem .55rem;
  border-radius: 4px;
  background: var(--accent-dim);
  color: var(--accent);
}

/* ── Tag pills ────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-size: .75rem;
  padding: .15rem .5rem;
  border-radius: 9999px;
  background: #f3f4f6;
  color: var(--text-dim);
  margin: .1rem .15rem;
}
.tag-toggle {
  display: inline-block;
  font-size: .78rem;
  padding: .25rem .7rem;
  border-radius: 9999px;
  background: #f3f4f6;
  color: var(--text-dim);
  border: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  transition: background .15s, color .15s, border-color .15s;
  margin: .1rem .15rem;
}
.tag-toggle:hover { border-color: var(--accent); }
.tag-toggle.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── Grid helpers ─────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
.flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: .5rem; }

/* ── Hamburger toggle (hidden on desktop) ────────────── */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  margin: 5px 0;
  border-radius: 1px;
  transition: transform .2s, opacity .2s;
}

/* ── Responsive: tablet (≤ 768px) ────────────────────── */
@media (max-width: 768px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }

  .container { padding: 1.25rem 1rem 2rem; }

  .card { padding: 1rem 1.15rem; }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.1rem; }

  /* Nav: show hamburger, dropdown overlay */
  .nav-toggle { display: block; }

  .topnav {
    padding: .65rem 1rem;
    gap: .75rem;
    position: sticky;
    top: 0;
  }
  .topnav .brand { flex: 1; }

  .topnav .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    flex-direction: column;
    padding: .5rem 1rem 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,.25);
    z-index: 99;
  }
  .topnav.open .nav-menu {
    display: flex;
  }
  .topnav .nav-links {
    display: flex;
    flex-direction: column;
    gap: .15rem;
  }
  .topnav .nav-links a {
    padding: .5rem .75rem;
  }
  .topnav .user-area {
    padding-top: .5rem;
    border-top: 1px solid rgba(255,255,255,.1);
    margin-top: .5rem;
    flex-direction: row;
    flex-wrap: wrap;
  }

  /* Stats: 2 per row */
  .stats { gap: .75rem; }
  .stat-box { min-width: calc(50% - .75rem); }
}

/* ── Responsive: phone (≤ 480px) ─────────────────────── */
@media (max-width: 480px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }

  .container { padding: 1rem .75rem 2rem; }

  .card { padding: .85rem 1rem; }

  h1 { font-size: 1.3rem; }

  /* Stats: stack vertically */
  .stats { flex-direction: column; }
  .stat-box { min-width: 100%; }

  /* Flex-between: stack on tiny screens */
  .flex-between { flex-direction: column; align-items: flex-start; }

  /* Buttons: full width */
  .btn { width: 100%; justify-content: center; }
  .btn-sm { width: auto; }

  /* Auth wrapper: less margin */
  .auth-wrapper { margin: 1.5rem auto; padding: 0 .5rem; }
  .auth-wrapper .card { padding: 1.25rem; }

  /* Score badge: below title instead of beside it */
  .score-badge { margin-top: .35rem; }

  /* Pagination: tighter */
  .pagination { gap: .2rem; }
  .pagination a, .pagination span { padding: .3rem .5rem; font-size: .75rem; }
}

/* ── Pagination ───────────────────────────────────────── */
.pagination { display: flex; justify-content: center; gap: .35rem; margin: 1.5rem 0; flex-wrap: wrap; }
.pagination a, .pagination span {
  padding: .35rem .7rem;
  font-size: .8rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.pagination a { color: var(--text); }
.pagination a:hover { background: var(--bg); text-decoration: none; }
.pagination .current { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ── Auth layout ──────────────────────────────────────── */
.auth-wrapper {
  max-width: 420px;
  margin: 4rem auto;
}
.auth-wrapper .card { padding: 2rem; }

/* ── Date group header ────────────────────────────────── */
.date-header {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dim);
  padding: .5rem 0;
  border-bottom: 2px solid var(--border);
  margin: 1.5rem 0 .75rem;
}
.date-header:first-child { margin-top: 0; }

/* ── Tabs (paper management) ──────────────────────────── */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1rem;
}
.tab-btn {
  background: none;
  border: none;
  padding: .5rem 1rem;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-dim);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;          /* overlap the bar border */
  transition: color .15s, border-color .15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Search results scroll ────────────────────────────── */
.search-results-scroll {
  max-height: 31rem;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 .75rem;
  margin-top: .5rem;
}

/* ── Spinner ─────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
  margin-right: .4rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Beta banner ──────────────────────────────────────────── */
.beta-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  background: var(--accent-dim);
  color: var(--text);
  font-size: .82rem;
  padding: .4rem 1rem;
  text-align: center;
}
.beta-banner a { font-weight: 600; }
.banner-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-dim);
  padding: 0 .25rem;
  line-height: 1;
}
.banner-close:hover { color: var(--text); }

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  margin-top: 2rem;
  font-size: .8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}
.site-footer a { color: var(--text-dim); text-decoration: underline; }
.site-footer a:hover { color: var(--text); }
.footer-sep { margin: 0 .35rem; opacity: .5; }

/* ── Misc ─────────────────────────────────────────────── */
.text-dim { color: var(--text-dim); }
.text-sm  { font-size: .8rem; }
.text-mono { font-family: var(--font-mono); }
.mt-1 { margin-top: .5rem; }
.mb-1 { margin-bottom: .5rem; }
.mb-2 { margin-bottom: 1rem; }
hr { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }