/* =====================================================
   GymFlow Design System — Core CSS Variables & Base
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---- Color Tokens ---- */
:root {
  --gf-bg:          #080810;
  --gf-surface:     #0f0f1a;
  --gf-surface-2:   #16162a;
  --gf-surface-3:   #1e1e35;
  --gf-border:      rgba(255,255,255,0.08);
  --gf-border-act:  rgba(255,255,255,0.18);

  /* Accent — overridden by gym branding */
  --gf-accent:      #00f5d4;
  --gf-accent-dim:  rgba(0,245,212,0.15);
  --gf-accent-2:    #ff6b35;
  --gf-accent-2dim: rgba(255,107,53,0.15);

  /* State colors */
  --gf-work:        #00f5d4;
  --gf-rest:        #3d5afe;
  --gf-transition:  #ff9800;
  --gf-finished:    #4caf50;
  --gf-danger:      #ef4444;
  --gf-warning:     #f59e0b;

  /* Text */
  --gf-text:        #f0f0ff;
  --gf-text-muted:  #8888aa;
  --gf-text-dim:    #55558a;

  /* Typography */
  --font-display:   'Bebas Neue', serif;
  --font-body:      'Inter', sans-serif;

  /* Sizing */
  --radius-sm:      6px;
  --radius:         12px;
  --radius-lg:      20px;
  --radius-xl:      28px;

  /* Shadows */
  --shadow:         0 4px 24px rgba(0,0,0,0.4);
  --shadow-accent:  0 0 32px rgba(0,245,212,0.2);
  --shadow-glow:    0 0 60px rgba(0,245,212,0.12);

  /* Sidebar */
  --sidebar-w:      260px;
  --header-h:       64px;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--gf-bg);
  color: var(--gf-text);
  font-family: var(--font-body);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--gf-surface); }
::-webkit-scrollbar-thumb { background: var(--gf-surface-3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gf-accent); }

/* ---- Typography ---- */
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.2; }
.display { font-family: var(--font-display); letter-spacing: 0.04em; }

.text-accent  { color: var(--gf-accent); }
.text-accent2 { color: var(--gf-accent-2); }
.text-muted   { color: var(--gf-text-muted); }
.text-danger  { color: var(--gf-danger); }

/* ---- Gradient Text ---- */
.gradient-text {
  background: linear-gradient(135deg, var(--gf-accent), var(--gf-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.sidebar {
  width: var(--sidebar-w);
  background: var(--gf-surface);
  border-right: 1px solid var(--gf-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform 0.3s ease;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-header {
  height: var(--header-h);
  background: var(--gf-surface);
  border-bottom: 1px solid var(--gf-border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-body {
  padding: 28px;
  flex: 1;
}

/* ---- Sidebar ---- */
.sidebar-brand {
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
  border-bottom: 1px solid var(--gf-border);
}

.sidebar-logo {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.sidebar-brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--gf-accent);
  letter-spacing: 0.1em;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gf-text-dim);
  padding: 16px 8px 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--gf-text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav-item:hover {
  background: var(--gf-surface-2);
  color: var(--gf-text);
}

.nav-item.active {
  background: var(--gf-accent-dim);
  color: var(--gf-accent);
  font-weight: 600;
}

.nav-item svg, .nav-item .icon { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--gf-border);
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius);
  background: var(--gf-surface-2);
}

.user-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gf-accent), var(--gf-accent-2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px; color: var(--gf-bg);
  flex-shrink: 0;
}

.user-info { flex: 1; min-width: 0; }
.user-name { font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-role { font-size: 11px; color: var(--gf-text-muted); text-transform: capitalize; }

/* ---- Cards ---- */
.card {
  background: var(--gf-surface);
  border: 1px solid var(--gf-border);
  border-radius: var(--radius);
  padding: 24px;
}

.card-hover {
  transition: all 0.2s ease;
}

.card-hover:hover {
  border-color: var(--gf-accent-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.card-accent {
  border-color: var(--gf-accent);
  box-shadow: var(--shadow-accent);
}

/* ---- Stat Cards ---- */
.stat-card {
  background: var(--gf-surface);
  border: 1px solid var(--gf-border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.stat-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  background: var(--gf-accent-dim);
  display: flex; align-items: center; justify-content: center;
  color: var(--gf-accent);
  flex-shrink: 0;
}

.stat-value { font-size: 28px; font-weight: 800; color: var(--gf-text); line-height: 1; }
.stat-label { font-size: 12px; color: var(--gf-text-muted); margin-top: 2px; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-body);
}

.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--gf-accent);
  color: #0a0a0f;
}
.btn-primary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--gf-accent) 85%, white);
  box-shadow: 0 0 20px rgba(0,245,212,0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--gf-surface-3);
  color: var(--gf-text);
  border: 1px solid var(--gf-border-act);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--gf-surface-2);
  border-color: var(--gf-accent);
}

.btn-danger {
  background: rgba(239,68,68,0.15);
  color: var(--gf-danger);
  border: 1px solid rgba(239,68,68,0.3);
}
.btn-danger:hover:not(:disabled) {
  background: rgba(239,68,68,0.25);
}

.btn-ghost {
  background: transparent;
  color: var(--gf-text-muted);
  border: 1px solid var(--gf-border);
}
.btn-ghost:hover { background: var(--gf-surface-2); color: var(--gf-text); }

.btn-icon {
  width: 36px; height: 36px;
  padding: 0;
  justify-content: center;
}

.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-sm { padding: 6px 14px; font-size: 12px; }

/* ---- Form Elements ---- */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--gf-text-muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.05em; }

.form-control {
  width: 100%;
  background: var(--gf-surface-2);
  border: 1px solid var(--gf-border);
  border-radius: var(--radius-sm);
  color: var(--gf-text);
  padding: 10px 14px;
  font-size: 14px;
  font-family: var(--font-body);
  transition: border-color 0.2s;
  outline: none;
}
.form-control:focus { border-color: var(--gf-accent); box-shadow: 0 0 0 3px var(--gf-accent-dim); }
.form-control::placeholder { color: var(--gf-text-dim); }

select.form-control { cursor: pointer; }

/* Color Input */
.color-input-row { display: flex; align-items: center; gap: 10px; }
input[type="color"] {
  width: 44px; height: 38px;
  border: 1px solid var(--gf-border); border-radius: var(--radius-sm);
  background: var(--gf-surface-2); cursor: pointer; padding: 2px;
}

/* ---- Badges ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge-accent  { background: var(--gf-accent-dim);  color: var(--gf-accent); }
.badge-orange  { background: var(--gf-accent-2dim); color: var(--gf-accent-2); }
.badge-work    { background: rgba(0,245,212,0.2);   color: var(--gf-work); }
.badge-rest    { background: rgba(61,90,254,0.2);   color: var(--gf-rest); }
.badge-danger  { background: rgba(239,68,68,0.15);  color: var(--gf-danger); }
.badge-muted   { background: var(--gf-surface-3);   color: var(--gf-text-muted); }
.badge-success { background: rgba(76,175,80,0.2);   color: var(--gf-finished); }

/* ---- Grids ---- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---- Tables ---- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; }
thead tr { border-bottom: 2px solid var(--gf-border); }
thead th { padding: 12px 16px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gf-text-muted); text-align: left; }
tbody tr { border-bottom: 1px solid var(--gf-border); transition: background 0.15s; }
tbody tr:hover { background: var(--gf-surface-2); }
tbody td { padding: 14px 16px; font-size: 14px; vertical-align: middle; }
tbody tr:last-child { border-bottom: none; }

/* ---- Modals ---- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  z-index: 500;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--gf-surface);
  border: 1px solid var(--gf-border-act);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: min(560px, 95vw);
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.25s ease;
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }

.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.modal-title { font-size: 20px; font-weight: 700; }
.modal-close { background: none; border: none; cursor: pointer; color: var(--gf-text-muted); padding: 4px; }
.modal-close:hover { color: var(--gf-text); }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 24px; }

/* ---- Toast ---- */
.toast-container {
  position: fixed; top: 20px; right: 20px; z-index: 9999;
  display: flex; flex-direction: column; gap: 10px;
}
.toast {
  background: var(--gf-surface-3);
  border: 1px solid var(--gf-border-act);
  border-radius: var(--radius);
  padding: 14px 18px;
  min-width: 280px;
  display: flex; gap: 12px; align-items: flex-start;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow);
}
.toast.success { border-left: 3px solid var(--gf-finished); }
.toast.error   { border-left: 3px solid var(--gf-danger); }
.toast.info    { border-left: 3px solid var(--gf-accent); }

@keyframes slideIn { from { transform: translateX(40px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ---- Loading ---- */
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--gf-surface-3);
  border-top-color: var(--gf-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.skeleton {
  background: linear-gradient(90deg, var(--gf-surface-2) 25%, var(--gf-surface-3) 50%, var(--gf-surface-2) 75%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { to { background-position: -400% 0; } }

/* ---- Tabs ---- */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--gf-border); margin-bottom: 24px; }
.tab {
  padding: 10px 18px;
  font-size: 14px; font-weight: 600;
  color: var(--gf-text-muted);
  border: none; background: none; cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.2s;
  font-family: var(--font-body);
}
.tab:hover { color: var(--gf-text); }
.tab.active { color: var(--gf-accent); border-bottom-color: var(--gf-accent); }

/* ---- Search ---- */
.search-box {
  position: relative;
  display: flex; align-items: center;
}
.search-box svg { position: absolute; left: 12px; color: var(--gf-text-dim); pointer-events: none; }
.search-box .form-control { padding-left: 38px; }

/* ---- Empty State ---- */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 60px 20px; gap: 16px; text-align: center;
}
.empty-state svg { color: var(--gf-text-dim); opacity: 0.5; }
.empty-state h3 { font-size: 18px; color: var(--gf-text-muted); }
.empty-state p { font-size: 14px; color: var(--gf-text-dim); max-width: 320px; }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root { --sidebar-w: 0px; }
  .sidebar { transform: translateX(-260px); width: 260px; }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-body { padding: 16px; }
}

/* ---- Pill Indicator ---- */
.dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.dot-live { background: var(--gf-accent); box-shadow: 0 0 8px var(--gf-accent); animation: pulse-dot 1.5s ease infinite; }
.dot-idle { background: var(--gf-text-dim); }
.dot-paused { background: var(--gf-warning); }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}

/* ---- Separator ---- */
hr { border: none; border-top: 1px solid var(--gf-border); margin: 20px 0; }

/* ---- Utility ---- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.w-full { width: 100%; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.ml-auto { margin-left: auto; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hidden { display: none !important; }