/* ==========================================================================
   PT Management System — Design System CSS
   Inspired by Spotify dark theme × Soritune brand
   Font: Pretendard (loaded via CDN in HTML)
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Backgrounds */
  --bg:           #121212;
  --surface:      #181818;
  --surface-hover:#1f1f1f;
  --card:         #252525;

  /* Brand */
  --accent:       #FF5E00;
  --accent-border:#E65500;
  --accent-dark:  #cc4b00;

  /* Text */
  --text:           #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted:     #cbcbcb;

  /* Semantic */
  --negative: #f3727f;
  --warning:  #ffa42b;
  --info:     #539df5;
  --success:  #22c55e;

  /* Borders */
  --border:       #4d4d4d;
  --border-light: #7c7c7c;

  /* Shadows */
  --shadow-elevated: rgba(0,0,0,0.5) 0px 8px 24px;
  --shadow-card:     rgba(0,0,0,0.3) 0px 8px 8px;
  --shadow-medium:   rgba(0,0,0,0.4) 0px 4px 16px;
  --shadow-inset:    rgb(18,18,18) 0px 1px 0px, rgb(124,124,124) 0px 0px 0px 1px inset;

  /* Surface variants */
  --surface-card: #252525;

  /* Sidebar */
  --sidebar-width: 220px;

  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   6px;
  --radius-lg:   8px;
  --radius-xl:  12px;
  --radius-pill: 9999px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont,
    system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo',
    'Noto Sans KR', 'Malgun Gothic', sans-serif;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, select, textarea {
  font-family: inherit;
}

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

/* --------------------------------------------------------------------------
   Sidebar
   -------------------------------------------------------------------------- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background-color: var(--bg);
  display: flex;
  flex-direction: column;
  padding: var(--space-5) 0;
  overflow-y: auto;
  z-index: 100;
  border-right: 1px solid var(--border);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-4) var(--space-5);
  color: var(--accent);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.sidebar-logo span {
  color: var(--text);
}

.sidebar-section {
  margin-bottom: var(--space-6);
}

.sidebar-section-title {
  padding: 0 var(--space-4) var(--space-2);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
}

.sidebar-nav a,
.sidebar-nav button {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px var(--space-4);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  transition: color 0.15s, background-color 0.15s;
  border-radius: 0;
  width: 100%;
  text-align: left;
}

.sidebar-nav a:hover,
.sidebar-nav button:hover {
  color: var(--text);
  background-color: var(--surface-hover);
}

.sidebar-nav a.active,
.sidebar-nav button.active {
  color: var(--text);
  font-weight: 700;
}

.sidebar-nav a.active::before {
  content: '';
  display: block;
  width: 3px;
  height: 100%;
  background: var(--accent);
  position: absolute;
  left: 0;
}

.sidebar-nav a {
  position: relative;
}

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------------------------------------
   Topbar
   -------------------------------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 56px;
  box-shadow: var(--shadow-card);
}

.topbar-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Page content area */
.page-content {
  padding: var(--space-6);
  flex: 1;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  transition: background-color 0.15s, color 0.15s, opacity 0.15s, transform 0.1s;
  white-space: nowrap;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary — Soritune Orange */
.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-dark);
}

/* Secondary — dark surface */
.btn-secondary {
  background-color: var(--surface-hover);
  color: var(--text);
}

.btn-secondary:hover {
  background-color: #2a2a2a;
}

/* Outline */
.btn-outline {
  background-color: transparent;
  color: var(--text);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--text);
  background-color: rgba(255,255,255,0.05);
}

/* Danger */
.btn-danger {
  background-color: var(--negative);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #e85f6c;
}

/* Small variant */
.btn-small {
  padding: 5px 12px;
  font-size: 12px;
  letter-spacing: 1px;
}

/* Icon-only circular */
.btn-icon {
  padding: 8px;
  border-radius: 50%;
  letter-spacing: 0;
  text-transform: none;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-elevated);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  gap: var(--space-3);
}

.card-title {
  font-size: 16px;
  font-weight: 700;
}

.card-subtitle {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Data Tables
   -------------------------------------------------------------------------- */
.data-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--surface);
  font-size: 14px;
}

.data-table thead tr {
  border-bottom: 1px solid var(--border);
}

.data-table th {
  padding: 12px var(--space-4);
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}

.data-table td {
  padding: 12px var(--space-4);
  color: var(--text);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  vertical-align: middle;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background-color: var(--surface-hover);
}

.data-table tbody tr {
  transition: background-color 0.1s;
}

/* --------------------------------------------------------------------------
   Badges — Status
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 10.5px;
  font-weight: 600;
  line-height: 1.33;
  white-space: nowrap;
}

/* Order statuses */
.badge-진행중    { background-color: rgba(34,197,94,0.2);   color: var(--success); }
.badge-진행예정  { background-color: rgba(83,157,245,0.2);  color: var(--info); }
.badge-매칭대기  { background-color: rgba(255,94,0,0.2);    color: var(--accent); }
.badge-매칭완료  { background-color: rgba(83,157,245,0.15); color: var(--info); }
.badge-연기      { background-color: rgba(255,164,43,0.2);  color: var(--warning); }
.badge-중단      { background-color: rgba(243,114,127,0.2); color: var(--negative); }
.badge-환불      { background-color: rgba(243,114,127,0.15);color: var(--negative); }
.badge-종료      { background-color: rgba(179,179,179,0.15);color: var(--text-secondary); }

/* Generic active / inactive */
.badge-active   { background-color: rgba(34,197,94,0.2);   color: var(--success); }
.badge-inactive { background-color: rgba(179,179,179,0.15);color: var(--text-secondary); }

/* Product type */
.badge-count  { background-color: rgba(83,157,245,0.15);  color: var(--info); }
.badge-period { background-color: rgba(255,164,43,0.15);  color: var(--warning); }

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

.form-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.form-input,
.form-select,
.form-textarea {
  background-color: var(--surface-hover);
  color: var(--text);
  border: none;
  border-radius: var(--radius-md);
  padding: 10px var(--space-3);
  font-size: 14px;
  font-family: inherit;
  width: 100%;
  box-shadow: var(--shadow-inset);
  transition: box-shadow 0.15s;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  box-shadow: rgb(18,18,18) 0px 1px 0px, var(--accent) 0px 0px 0px 2px inset;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23b3b3b3' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-hint {
  font-size: 12px;
  color: var(--text-secondary);
}

.form-error {
  font-size: 12px;
  color: var(--negative);
}

/* --------------------------------------------------------------------------
   Search Input (pill)
   -------------------------------------------------------------------------- */
.search-input {
  background-color: var(--surface-hover);
  color: var(--text);
  border: none;
  border-radius: var(--radius-pill);
  padding: 10px 20px 10px 44px;
  font-size: 14px;
  font-family: inherit;
  width: 100%;
  max-width: 320px;
  box-shadow: rgb(124,124,124) 0px 0px 0px 1px inset;
  outline: none;
  transition: box-shadow 0.15s;
}

.search-input:focus {
  box-shadow: var(--text) 0px 0px 0px 1px inset;
}

.search-input::placeholder {
  color: var(--text-secondary);
}

.search-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.search-wrapper .search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-secondary);
  pointer-events: none;
  display: flex;
  align-items: center;
}

/* --------------------------------------------------------------------------
   Filters & Filter Pills
   -------------------------------------------------------------------------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px var(--space-3);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  background-color: var(--surface-hover);
  border: 1px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
  user-select: none;
}

.filter-pill:hover {
  color: var(--text);
  background-color: #2a2a2a;
}

.filter-pill.active {
  color: var(--text);
  border-color: var(--text);
  background-color: transparent;
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-5);
}

.tab-btn {
  padding: 12px var(--space-4);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* --------------------------------------------------------------------------
   Modals
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
}

.modal {
  background-color: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-elevated);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: color 0.15s, background-color 0.15s;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
}

.modal-close:hover {
  color: var(--text);
  background-color: var(--surface-hover);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
}

/* Modal sizes */
.modal-sm { max-width: 360px; }
.modal-lg { max-width: 720px; }
.modal-xl { max-width: 960px; }

/* --------------------------------------------------------------------------
   Progress Bar
   -------------------------------------------------------------------------- */
.progress-bar {
  width: 100%;
  height: 6px;
  background-color: var(--surface-hover);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-pill);
  background-color: var(--accent);
  transition: width 0.3s ease;
}

.progress-fill.success { background-color: var(--success); }
.progress-fill.warning { background-color: var(--warning); }
.progress-fill.danger  { background-color: var(--negative); }

/* --------------------------------------------------------------------------
   Session List
   -------------------------------------------------------------------------- */
.session-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3) 0;
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background-color: var(--surface-hover);
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
  cursor: default;
  position: relative;
}

.session-check {
  background-color: rgba(34,197,94,0.15);
  border-color: var(--success);
  color: var(--success);
}

.session-check::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* --------------------------------------------------------------------------
   Info Grid (detail views)
   -------------------------------------------------------------------------- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.info-value {
  font-size: 14px;
  font-weight: 400;
  color: var(--text);
}

/* --------------------------------------------------------------------------
   PT Progress Card
   -------------------------------------------------------------------------- */
.pt-progress-card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.pt-progress-card .pt-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.pt-progress-card .pt-name {
  font-size: 16px;
  font-weight: 700;
}

.pt-progress-card .pt-meta {
  font-size: 12px;
  color: var(--text-secondary);
}

.pt-progress-card .pt-stats {
  display: flex;
  gap: var(--space-4);
  font-size: 13px;
  color: var(--text-secondary);
}

.pt-progress-card .pt-stats strong {
  color: var(--text);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   Empty State
   -------------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-4);
  text-align: center;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 40px;
  opacity: 0.4;
  margin-bottom: var(--space-2);
}

.empty-state-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.empty-state-text {
  font-size: 14px;
  max-width: 360px;
}

/* --------------------------------------------------------------------------
   Loading State
   -------------------------------------------------------------------------- */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  color: var(--text-secondary);
  gap: var(--space-3);
}

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* --------------------------------------------------------------------------
   Login Page
   -------------------------------------------------------------------------- */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg);
  padding: var(--space-4);
}

.login-card {
  background-color: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-elevated);
}

.login-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  text-align: center;
}

.login-logo-mark {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1px;
}

.login-logo-sub {
  font-size: 13px;
  color: var(--text-secondary);
}

.login-title {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-5);
}

.login-error {
  background-color: rgba(243,114,127,0.1);
  border: 1px solid rgba(243,114,127,0.3);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: 13px;
  color: var(--negative);
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Stats / KPI Cards
   -------------------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
}

.stat-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--text);
}

.stat-value-unit {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 4px;
}

/* --------------------------------------------------------------------------
   Alerts / Notifications
   -------------------------------------------------------------------------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 13px;
  margin-bottom: var(--space-4);
}

.alert-success { background-color: rgba(34,197,94,0.1);   color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.alert-warning { background-color: rgba(255,164,43,0.1);  color: var(--warning); border: 1px solid rgba(255,164,43,0.2); }
.alert-danger  { background-color: rgba(243,114,127,0.1); color: var(--negative); border: 1px solid rgba(243,114,127,0.2); }
.alert-info    { background-color: rgba(83,157,245,0.1);  color: var(--info); border: 1px solid rgba(83,157,245,0.2); }

/* --------------------------------------------------------------------------
   Divider
   -------------------------------------------------------------------------- */
.divider {
  height: 1px;
  background-color: var(--border);
  margin: var(--space-4) 0;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-secondary { color: var(--text-secondary); }
.text-accent    { color: var(--accent); }
.text-success   { color: var(--success); }
.text-warning   { color: var(--warning); }
.text-danger    { color: var(--negative); }
.text-info      { color: var(--info); }
.text-muted     { color: var(--text-muted); }

.text-sm   { font-size: 12px; }
.text-xs   { font-size: 11px; }
.text-base { font-size: 14px; }
.text-lg   { font-size: 16px; }
.text-xl   { font-size: 18px; }
.text-2xl  { font-size: 24px; }

.font-bold    { font-weight: 700; }
.font-semibold{ font-weight: 600; }
.font-regular { font-weight: 400; }
.uppercase    { text-transform: uppercase; letter-spacing: 1.4px; }

.flex         { display: flex; }
.flex-col     { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-end  { justify-content: flex-end; }
.gap-2        { gap: var(--space-2); }
.gap-3        { gap: var(--space-3); }
.gap-4        { gap: var(--space-4); }

.w-full  { width: 100%; }
.mt-4    { margin-top: var(--space-4); }
.mt-6    { margin-top: var(--space-6); }
.mb-4    { margin-bottom: var(--space-4); }
.mb-6    { margin-bottom: var(--space-6); }
.p-4     { padding: var(--space-4); }
.py-4    { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.px-4    { padding-left: var(--space-4); padding-right: var(--space-4); }

.rounded     { border-radius: var(--radius-md); }
.rounded-lg  { border-radius: var(--radius-lg); }
.rounded-full{ border-radius: var(--radius-pill); }

/* --------------------------------------------------------------------------
   Scrollbar Styling (Webkit)
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #666;
}

/* --------------------------------------------------------------------------
   Responsive — 768px breakpoint
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    width: 240px;
    z-index: 200;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-elevated);
  }

  .main-content {
    margin-left: 0;
  }

  .topbar {
    padding: var(--space-3) var(--space-4);
  }

  .page-content {
    padding: var(--space-4);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  .modal {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
  }

  .data-table th,
  .data-table td {
    padding: 10px var(--space-3);
  }

  .btn {
    padding: 8px 16px;
  }

  .filters {
    gap: 6px;
  }

  .topbar-title {
    font-size: 16px;
  }

  /* Mobile menu toggle — show hamburger */
  .mobile-menu-btn {
    display: flex;
  }

  /* Overlay for open sidebar on mobile */
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 199;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
  }

  .sidebar-backdrop.open {
    opacity: 1;
    pointer-events: auto;
  }
}

/* Hide mobile-only elements on desktop */
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
}

.sidebar-backdrop {
  display: none;
}

/* --------------------------------------------------------------------------
   Additional utility classes (C3)
   -------------------------------------------------------------------------- */
.login-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 28px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.page-title {
  font-size: 24px;
  font-weight: 700;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 24px;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 13px;
}

.card-elevated {
  box-shadow: var(--shadow-medium);
}

.info-item-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.info-item-value {
  font-size: 15px;
  font-weight: 500;
}

.pt-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.pt-progress-title {
  font-weight: 700;
  font-size: 14px;
}

.pt-progress-coach {
  color: var(--text-secondary);
  font-size: 13px;
}

.pt-progress-meta {
  color: var(--text-secondary);
  font-size: 12px;
  margin-bottom: 4px;
}

.session-date {
  color: var(--text-secondary);
  font-size: 12px;
}