/* ═══════════════════════════════════════════════════════════
   SlotBook – Main Stylesheet
   Font: Syne (display) + DM Sans (body)
   6 Themes: slate · ocean · rose · emerald · lavender · amber
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 15px; }
body {
  font-family: 'DM Sans', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background .3s, color .3s;
  line-height: 1.6;
}

/* ══════════════════════════════════════
   THEMES
   ══════════════════════════════════════ */

/* Slate (default dark) */
.theme-slate {
  --bg:          #0f172a;
  --bg2:         #1e293b;
  --bg3:         #334155;
  --surface:     #1e293b;
  --surface2:    #253348;
  --border:      #334155;
  --text:        #e2e8f0;
  --text2:       #94a3b8;
  --text3:       #64748b;
  --accent:      #6366f1;
  --accent-h:    #818cf8;
  --accent-soft: rgba(99,102,241,.15);
  --danger:      #f87171;
  --success:     #4ade80;
  --warning:     #fbbf24;
  --info:        #38bdf8;
  --shadow:      0 4px 24px rgba(0,0,0,.4);
  --radius:      12px;
  --radius-sm:   8px;
}

/* Ocean */
.theme-ocean {
  --bg:          #0a1628;
  --bg2:         #0d2038;
  --bg3:         #163450;
  --surface:     #0d2038;
  --surface2:    #163450;
  --border:      #1e4a6e;
  --text:        #e0f2fe;
  --text2:       #7dd3fc;
  --text3:       #38bdf8;
  --accent:      #0ea5e9;
  --accent-h:    #38bdf8;
  --accent-soft: rgba(14,165,233,.15);
  --danger:      #fb7185;
  --success:     #34d399;
  --warning:     #fbbf24;
  --info:        #67e8f9;
  --shadow:      0 4px 24px rgba(0,0,0,.5);
  --radius:      12px;
  --radius-sm:   8px;
}

/* Rose */
.theme-rose {
  --bg:          #1a0a10;
  --bg2:         #2d1020;
  --bg3:         #3f1830;
  --surface:     #2d1020;
  --surface2:    #3f1830;
  --border:      #5e2040;
  --text:        #fce7f3;
  --text2:       #f9a8d4;
  --text3:       #f472b6;
  --accent:      #ec4899;
  --accent-h:    #f472b6;
  --accent-soft: rgba(236,72,153,.15);
  --danger:      #fb7185;
  --success:     #34d399;
  --warning:     #fbbf24;
  --info:        #67e8f9;
  --shadow:      0 4px 24px rgba(0,0,0,.5);
  --radius:      12px;
  --radius-sm:   8px;
}

/* Emerald */
.theme-emerald {
  --bg:          #021a0e;
  --bg2:         #042d18;
  --bg3:         #064e2a;
  --surface:     #042d18;
  --surface2:    #064e2a;
  --border:      #0d6e3a;
  --text:        #d1fae5;
  --text2:       #6ee7b7;
  --text3:       #34d399;
  --accent:      #10b981;
  --accent-h:    #34d399;
  --accent-soft: rgba(16,185,129,.15);
  --danger:      #fb7185;
  --success:     #4ade80;
  --warning:     #fbbf24;
  --info:        #67e8f9;
  --shadow:      0 4px 24px rgba(0,0,0,.5);
  --radius:      12px;
  --radius-sm:   8px;
}

/* Lavender */
.theme-lavender {
  --bg:          #110d1f;
  --bg2:         #1c1535;
  --bg3:         #2a1f4f;
  --surface:     #1c1535;
  --surface2:    #2a1f4f;
  --border:      #3d2c6e;
  --text:        #ede9fe;
  --text2:       #c4b5fd;
  --text3:       #a78bfa;
  --accent:      #a855f7;
  --accent-h:    #c084fc;
  --accent-soft: rgba(168,85,247,.15);
  --danger:      #fb7185;
  --success:     #4ade80;
  --warning:     #fbbf24;
  --info:        #67e8f9;
  --shadow:      0 4px 24px rgba(0,0,0,.5);
  --radius:      12px;
  --radius-sm:   8px;
}

/* Amber (light) */
.theme-amber {
  --bg:          #fefce8;
  --bg2:         #fef9c3;
  --bg3:         #fef08a;
  --surface:     #ffffff;
  --surface2:    #fef9c3;
  --border:      #fde68a;
  --text:        #1c1917;
  --text2:       #57534e;
  --text3:       #a8a29e;
  --accent:      #d97706;
  --accent-h:    #b45309;
  --accent-soft: rgba(217,119,6,.12);
  --danger:      #dc2626;
  --success:     #16a34a;
  --warning:     #d97706;
  --info:        #0891b2;
  --shadow:      0 4px 24px rgba(0,0,0,.1);
  --radius:      12px;
  --radius-sm:   8px;
}

/* ── Layout ── */
.app-shell { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: 260px;
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform .3s cubic-bezier(.4,0,.2,1);
}
.sidebar-brand {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-brand h1 {
  font-family: 'Syne', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -.5px;
}
.sidebar-brand small {
  font-size: .7rem;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: block;
  margin-top: 2px;
}
.sidebar-nav {
  flex: 1;
  padding: 1rem 0;
  overflow-y: auto;
}
.nav-section {
  padding: .25rem .75rem;
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text3);
  font-weight: 600;
  margin-top: .75rem;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .6rem 1.25rem;
  color: var(--text2);
  text-decoration: none;
  font-size: .875rem;
  border-radius: 0;
  transition: background .15s, color .15s;
  position: relative;
}
.nav-link:hover { background: var(--accent-soft); color: var(--text); }
.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
}
.nav-icon {
  width: 18px;
  height: 18px;
  opacity: .8;
  flex-shrink: 0;
}
.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}
.user-chip {
  display: flex;
  align-items: center;
  gap: .75rem;
}
.user-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 2px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: .875rem;
  color: var(--accent);
  flex-shrink: 0;
}
.user-info { flex: 1; min-width: 0; }
.user-name {
  font-weight: 600;
  font-size: .8125rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-role {
  font-size: .7rem;
  color: var(--text3);
  text-transform: capitalize;
}

/* Main content */
.main-content {
  flex: 1;
  margin-left: 260px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: .875rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-title {
  font-family: 'Syne', sans-serif;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  flex: 1;
}
.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: .25rem;
}
.page-body {
  padding: 1.5rem;
  flex: 1;
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.card-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}
.card-body { padding: 1.25rem; }

/* Stat cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.stat-label { font-size: .75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text3); font-weight: 600; }
.stat-value { font-family: 'Syne', sans-serif; font-size: 2rem; font-weight: 800; color: var(--text); line-height: 1; }
.stat-sub   { font-size: .8rem; color: var(--text2); }
.stat-icon  { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: var(--accent-soft); margin-bottom: .25rem; }
.stat-icon svg { width: 20px; height: 20px; color: var(--accent); }

/* ── Tables ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
thead th {
  text-align: left;
  padding: .75rem 1rem;
  background: var(--bg2);
  color: var(--text3);
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
tbody tr { border-bottom: 1px solid var(--border); transition: background .1s; }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--surface2); }
tbody td { padding: .8rem 1rem; color: var(--text); vertical-align: middle; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: .875rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all .15s;
  line-height: 1;
  white-space: nowrap;
}
.btn svg { width: 15px; height: 15px; flex-shrink: 0; }
.btn-primary  { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-h); transform: translateY(-1px); }
.btn-ghost    { background: transparent; color: var(--text2); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--surface2); color: var(--text); }
.btn-danger   { background: rgba(248,113,113,.12); color: var(--danger); border: 1px solid rgba(248,113,113,.3); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-success  { background: rgba(74,222,128,.12); color: var(--success); border: 1px solid rgba(74,222,128,.3); }
.btn-success:hover { background: var(--success); color: #000; }
.btn-warning  { background: rgba(251,191,36,.12); color: var(--warning); border: 1px solid rgba(251,191,36,.3); }
.btn-warning:hover { background: var(--warning); color: #000; }
.btn-sm { padding: .35rem .75rem; font-size: .8rem; }
.btn-xs { padding: .25rem .55rem; font-size: .75rem; }
.btn-lg { padding: .75rem 1.5rem; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }

/* ── Forms ── */
.form-group { margin-bottom: 1rem; }
.form-label { display: block; font-size: .8125rem; font-weight: 600; color: var(--text2); margin-bottom: .375rem; }
.form-control {
  width: 100%;
  padding: .6rem .875rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: .875rem;
  transition: border-color .15s, box-shadow .15s;
  outline: none;
}
.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-control::placeholder { color: var(--text3); }
select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; min-height: 80px; }
.form-hint { font-size: .75rem; color: var(--text3); margin-top: .3rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
.form-check { display: flex; align-items: center; gap: .5rem; }
.form-check input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }
.checkbox-group { display: flex; flex-wrap: wrap; gap: .5rem 1rem; }

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .2rem .6rem;
  border-radius: 20px;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.badge-accent   { background: var(--accent-soft);           color: var(--accent); }
.badge-success  { background: rgba(74,222,128,.12);         color: var(--success); }
.badge-danger   { background: rgba(248,113,113,.12);        color: var(--danger); }
.badge-warning  { background: rgba(251,191,36,.12);         color: var(--warning); }
.badge-info     { background: rgba(56,189,248,.12);         color: var(--info); }
.badge-neutral  { background: var(--surface2);              color: var(--text3); }
.badge-male     { background: rgba(56,189,248,.12);         color: var(--info); }
.badge-female   { background: rgba(236,72,153,.12);         color: #f472b6; }
.badge-mixed    { background: rgba(168,85,247,.12);         color: #c084fc; }

/* ── Alerts / Flash ── */
.alert {
  padding: .875rem 1.125rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
  gap: .75rem;
}
.alert svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; }
.alert-success { background: rgba(74,222,128,.12); border: 1px solid rgba(74,222,128,.3); color: var(--success); }
.alert-danger  { background: rgba(248,113,113,.12); border: 1px solid rgba(248,113,113,.3); color: var(--danger); }
.alert-info    { background: rgba(56,189,248,.12);  border: 1px solid rgba(56,189,248,.3);  color: var(--info); }
.alert-warning { background: rgba(251,191,36,.12);  border: 1px solid rgba(251,191,36,.3);  color: var(--warning); }

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
  opacity: 0; pointer-events: none;
  transition: opacity .2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: min(560px, calc(100vw - 2rem));
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(.97);
  transition: transform .25s cubic-bezier(.34,1.56,.64,1);
  box-shadow: var(--shadow);
}
.modal-overlay.open .modal { transform: none; }
.modal-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-title { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 1.1rem; color: var(--text); }
.modal-close { background: none; border: none; color: var(--text3); cursor: pointer; padding: .25rem; border-radius: 6px; }
.modal-close:hover { color: var(--text); background: var(--surface2); }
.modal-body { padding: 1.25rem; }
.modal-footer { padding: 1rem 1.25rem; border-top: 1px solid var(--border); display: flex; gap: .75rem; justify-content: flex-end; }

/* ── Slot grid ── */
.slots-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: .75rem; }
.slot-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .875rem;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
  background: var(--surface2);
  position: relative;
}
.slot-card:hover:not(.slot-full):not(.slot-past):not(.slot-booked) {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-soft);
}
.slot-time { font-family: 'Syne', sans-serif; font-weight: 700; font-size: .95rem; color: var(--text); }
.slot-sub  { font-size: .72rem; color: var(--text3); margin-top: .2rem; }
.slot-bar  { height: 4px; background: var(--border); border-radius: 4px; margin-top: .5rem; overflow: hidden; }
.slot-bar-fill { height: 100%; background: var(--accent); border-radius: 4px; transition: width .3s; }
.slot-full  { opacity: .45; cursor: not-allowed; }
.slot-past  { opacity: .35; cursor: not-allowed; }
.slot-booked { border-color: var(--success); background: rgba(74,222,128,.05); }
.slot-booked .slot-time { color: var(--success); }

/* ── Activity cards ── */
.activity-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; }
.activity-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .15s, box-shadow .15s;
}
.activity-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.activity-card-accent { height: 4px; }
.activity-card-body { padding: 1.25rem; }
.activity-card-name { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 1.1rem; color: var(--text); margin-bottom: .4rem; }
.activity-card-meta { display: flex; flex-wrap: wrap; gap: .375rem; margin-bottom: .75rem; }
.activity-card-desc { font-size: .85rem; color: var(--text2); margin-bottom: 1rem; line-height: 1.5; }

/* ── Week nav ── */
.week-nav { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.25rem; }
.week-nav h3 { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 1rem; flex: 1; text-align: center; }
.day-tabs { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.day-tab {
  padding: .45rem .9rem;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text3);
  cursor: pointer;
  transition: all .15s;
}
.day-tab:hover { border-color: var(--accent); color: var(--accent); }
.day-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── Avatar initials ── */
.avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Syne', sans-serif;
  font-size: .7rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ── Theme picker ── */
.theme-grid { display: flex; flex-wrap: wrap; gap: .75rem; }
.theme-dot {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: transform .15s, border-color .15s;
  position: relative;
}
.theme-dot:hover { transform: scale(1.1); }
.theme-dot.active { border-color: #fff; box-shadow: 0 0 0 2px var(--accent); }
.theme-dot[data-theme="theme-slate"]    { background: linear-gradient(135deg,#0f172a,#6366f1); }
.theme-dot[data-theme="theme-ocean"]    { background: linear-gradient(135deg,#0a1628,#0ea5e9); }
.theme-dot[data-theme="theme-rose"]     { background: linear-gradient(135deg,#1a0a10,#ec4899); }
.theme-dot[data-theme="theme-emerald"]  { background: linear-gradient(135deg,#021a0e,#10b981); }
.theme-dot[data-theme="theme-lavender"] { background: linear-gradient(135deg,#110d1f,#a855f7); }
.theme-dot[data-theme="theme-amber"]    { background: linear-gradient(135deg,#fef9c3,#d97706); }

/* ── Progress bar ── */
.progress { height: 6px; background: var(--border); border-radius: 4px; overflow: hidden; }
.progress-bar { height: 100%; border-radius: 4px; background: var(--accent); transition: width .5s; }
.progress-bar.full { background: var(--danger); }

/* ── Login page ── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 1rem;
}
.login-box {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.login-header {
  padding: 2rem 1.75rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.login-logo {
  font-family: 'Syne', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
  margin-bottom: .25rem;
}
.login-tagline { font-size: .8rem; color: var(--text3); }
.login-body { padding: 1.75rem; }

/* ── Utilities ── */
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: .25rem; }
.gap-2 { gap: .5rem; }
.gap-3 { gap: .75rem; }
.gap-4 { gap: 1rem; }
.mt-1 { margin-top: .25rem; }
.mt-2 { margin-top: .5rem; }
.mt-3 { margin-top: .75rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: .25rem; }
.mb-2 { margin-bottom: .5rem; }
.mb-3 { margin-bottom: .75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.text-sm { font-size: .875rem; }
.text-xs { font-size: .75rem; }
.text-muted { color: var(--text3); }
.text-success { color: var(--success); }
.text-danger  { color: var(--danger); }
.text-accent  { color: var(--accent); }
.font-bold { font-weight: 700; }
.font-syne { font-family: 'Syne', sans-serif; }
.text-center { text-align: center; }
.w-full { width: 100%; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.divider { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text3); }
.empty-state svg { width: 48px; height: 48px; opacity: .3; margin-bottom: 1rem; }
.empty-state p  { font-size: .9rem; }

/* ── Sidebar overlay (mobile) ── */
.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 99;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow);
  }
  .sidebar-overlay.open { display: block; }
  .main-content { margin-left: 0; }
  .hamburger { display: flex; }
  .page-body { padding: 1rem; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .slots-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .activity-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .modal { margin: 0 .5rem; }
  .day-tabs { overflow-x: auto; flex-wrap: nowrap; padding-bottom: .25rem; }
}

/* ── Animations ── */
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:none} }
.fade-in { animation: fadeIn .3s ease both; }
@keyframes spin { to { transform: rotate(360deg); } }
.spin { animation: spin 1s linear infinite; }