/* ============================================================
   TRAIN — Premium Dark Mode Fitness App Stylesheet
   ============================================================ */

:root {
  --bg:          #0a0a0a;
  --surface:     #141414;
  --card:        #1c1c1c;
  --card-hover:  #232323;
  --border:      #2a2a2a;
  --accent:      #c6ff2e;
  --accent-dim:  rgba(198,255,46,0.1);
  --accent-glow: 0 0 24px rgba(198,255,46,0.25);
  --text:        #f0f0f0;
  --text-muted:  #888;
  --text-dim:    #404040;
  --danger:      #ff453a;
  --success:     #30d158;
  --warning:     #ffd60a;
  --blue:        #0a84ff;

  --radius-xs:   4px;
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   16px;
  --radius-xl:   24px;

  --sidebar-w:   240px;
  --topbar-h:    60px;
  --bottom-nav-h:64px;

  --font:     -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --mono:     'JetBrains Mono', 'SF Mono', 'Cascadia Code', 'Consolas', monospace;

  --shadow-sm: 0 1px 4px rgba(0,0,0,0.5);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.6);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.7);
  --anim: 180ms ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; }
body { font-family: var(--font); background: var(--bg); color: var(--text);
       line-height: 1.5; min-height: 100%; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; }
button { font-family: var(--font); }

/* ── App Shell ── */
.app-shell { display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 100vh; }

/* ── Sidebar ── */
.sidebar {
  background: var(--surface); border-right: 1px solid var(--border);
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  display: flex; flex-direction: column;
}
.sidebar-logo {
  padding: 20px 18px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px; flex-shrink: 0;
}
.logo-icon {
  width: 34px; height: 34px; background: var(--accent); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 18px; color: #000; flex-shrink: 0;
}
.logo-text { font-size: 18px; font-weight: 800; letter-spacing: 2px; }
.sidebar-nav { flex: 1; padding: 10px; overflow-y: auto; }
.nav-section-label {
  font-size: 10px; text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--text-dim); padding: 12px 10px 6px; font-weight: 700;
}
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px;
  border-radius: var(--radius-md); color: var(--text-muted); font-size: 14px;
  font-weight: 500; cursor: pointer; transition: all var(--anim);
  text-decoration: none; user-select: none;
}
.nav-item:hover { background: var(--card); color: var(--text); text-decoration: none; }
.nav-item.active { background: var(--accent-dim); color: var(--accent); font-weight: 600; }
.nav-icon { width: 20px; text-align: center; font-size: 16px; flex-shrink: 0; }
.sidebar-footer { padding: 14px; border-top: 1px solid var(--border); flex-shrink: 0; }
.user-card {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px;
  border-radius: var(--radius-md); cursor: pointer; transition: background var(--anim);
}
.user-card:hover { background: var(--card); }
.nav-avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--accent-dim);
  color: var(--accent); display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px; flex-shrink: 0; text-transform: uppercase;
}
.nav-username { font-size: 13px; font-weight: 600; }
.nav-role { font-size: 11px; color: var(--text-muted); text-transform: capitalize; }

/* ── Bottom Nav ── */
.bottom-nav {
  display: none; position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--bottom-nav-h); background: var(--surface);
  border-top: 1px solid var(--border); z-index: 90;
}
.bn-items { display: flex; justify-content: space-around; align-items: center; height: 100%; }
.bn-item {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  color: var(--text-muted); font-size: 10px; padding: 4px 12px;
  text-decoration: none; cursor: pointer; transition: color var(--anim);
  flex: 1; font-weight: 500;
}
.bn-item:hover { color: var(--text); text-decoration: none; }
.bn-item.active { color: var(--accent); }
.bn-icon { font-size: 20px; line-height: 1.2; }

/* ── Main Content ── */
.main-content { background: var(--bg); overflow: auto; }
.page { max-width: 880px; margin: 0 auto; padding: 32px 24px; }
.page-header { margin-bottom: 28px; display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.page-title { font-size: 28px; font-weight: 800; letter-spacing: -0.5px; }
.page-subtitle { color: var(--text-muted); margin-top: 4px; font-size: 15px; }

/* ── Cards ── */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px;
}
.card-sm { padding: 14px 16px; }
.card + .card { margin-top: 12px; }
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.card-title { font-size: 15px; font-weight: 700; }

/* ── Stat Cards ── */
.stat-grid { display: grid; gap: 12px; }
.stat-grid-2 { grid-template-columns: 1fr 1fr; }
.stat-grid-3 { grid-template-columns: repeat(3, 1fr); }
.stat-grid-4 { grid-template-columns: repeat(4, 1fr); }
.stat-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 18px 20px;
}
.stat-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); font-weight: 700; }
.stat-value { font-size: 34px; font-weight: 800; letter-spacing: -1px; margin-top: 4px; line-height: 1.1; }
.stat-accent { color: var(--accent); }
.stat-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: var(--radius-md); font-size: 14px; font-weight: 600;
  cursor: pointer; border: none; outline: none; transition: all var(--anim);
  text-decoration: none; white-space: nowrap; font-family: var(--font);
}
.btn:hover { text-decoration: none; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
  background: var(--accent); color: #000; box-shadow: var(--accent-glow);
}
.btn-primary:hover { background: #d4ff4a; box-shadow: 0 0 32px rgba(198,255,46,0.4); }
.btn-secondary { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--card-hover); border-color: #3a3a3a; }
.btn-danger { background: rgba(255,69,58,0.1); color: var(--danger); border: 1px solid rgba(255,69,58,0.2); }
.btn-danger:hover { background: rgba(255,69,58,0.2); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--card); color: var(--text); }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: var(--accent-dim); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: var(--radius-sm); }
.btn-lg { padding: 14px 24px; font-size: 16px; border-radius: var(--radius-lg); }
.btn-full { width: 100%; }
.btn .spin { width: 14px; height: 14px; border: 2px solid currentColor; border-top-color: transparent; border-radius: 50%; animation: spin 0.6s linear infinite; display: inline-block; flex-shrink: 0; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-muted); }
.form-control {
  width: 100%; padding: 11px 14px; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  font-size: 14px; font-family: var(--font); transition: border-color var(--anim); outline: none;
}
.form-control:focus { border-color: var(--accent); }
.form-control::placeholder { color: var(--text-dim); }
.form-control-sm { padding: 7px 10px; font-size: 13px; }
select.form-control { cursor: pointer; }
.form-error { font-size: 12px; color: var(--danger); margin-top: 5px; }
.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 5px; }
.input-group { display: flex; gap: 8px; }
.input-group .form-control { flex: 1; }

/* ── Auth Pages ── */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 30% 20%, rgba(198,255,46,0.04) 0%, transparent 60%),
              var(--bg);
  padding: 24px;
}
.auth-card {
  width: 100%; max-width: 420px; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 40px;
}
.auth-logo { text-align: center; margin-bottom: 30px; }
.auth-logo-mark {
  width: 60px; height: 60px; background: var(--accent); border-radius: var(--radius-md);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 30px; font-weight: 900; color: #000; margin-bottom: 14px;
}
.auth-title { font-size: 24px; font-weight: 800; margin-bottom: 6px; }
.auth-subtitle { color: var(--text-muted); font-size: 14px; }
.auth-footer { text-align: center; margin-top: 20px; font-size: 13px; color: var(--text-muted); }

/* ── Badges ── */
.badge {
  display: inline-flex; align-items: center; padding: 3px 9px;
  border-radius: 100px; font-size: 11px; font-weight: 700; letter-spacing: 0.3px;
}
.badge-accent { background: var(--accent-dim); color: var(--accent); }
.badge-success { background: rgba(48,209,88,0.1); color: var(--success); }
.badge-danger { background: rgba(255,69,58,0.1); color: var(--danger); }
.badge-warning { background: rgba(255,214,10,0.1); color: var(--warning); }
.badge-muted { background: var(--surface); color: var(--text-muted); border: 1px solid var(--border); }

/* PR badge */
.pr-badge {
  display: inline-flex; align-items: center; gap: 3px;
  background: var(--accent); color: #000;
  font-size: 10px; font-weight: 900; padding: 2px 6px;
  border-radius: 100px; letter-spacing: 0.5px; text-transform: uppercase;
}

/* ── Tables ── */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 12px 14px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--border); }
.table th { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; color: var(--text-muted); }
.table tr:last-child td { border-bottom: none; }
.table tbody tr:hover { background: rgba(255,255,255,0.025); }

/* ── Alerts ── */
.alert {
  padding: 12px 16px; border-radius: var(--radius-md); font-size: 14px;
  font-weight: 500; margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
}
.alert-err { background: rgba(255,69,58,0.1); border: 1px solid rgba(255,69,58,0.3); color: var(--danger); }
.alert-ok  { background: rgba(48,209,88,0.1); border: 1px solid rgba(48,209,88,0.3); color: var(--success); }
.alert.hidden { display: none; }

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.75);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 24px;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); width: 100%; max-width: 540px;
  max-height: 82vh; overflow-y: auto;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--card); z-index: 1;
}
.modal-title { font-size: 18px; font-weight: 700; }
.modal-body { padding: 20px 22px; }
.modal-footer {
  padding: 14px 22px; border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; gap: 10px;
  position: sticky; bottom: 0; background: var(--card);
}

/* ── Exercise Row (Program Builder / Workout) ── */
.exercise-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); margin-bottom: 10px; overflow: hidden;
}
.exercise-card-header {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.ex-name { font-weight: 700; font-size: 15px; flex: 1; }
.ex-meta { font-size: 12px; color: var(--text-muted); }
.set-cols-header {
  display: grid; grid-template-columns: 28px 1fr 1fr 1fr 40px;
  gap: 8px; padding: 7px 14px;
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.8px; color: var(--text-dim);
}
.set-row {
  display: grid; grid-template-columns: 28px 1fr 1fr 1fr 40px;
  gap: 8px; padding: 7px 14px; align-items: center;
  border-top: 1px solid var(--border);
  transition: background var(--anim);
}
.set-row.done { background: rgba(198,255,46,0.04); }
.set-num {
  width: 24px; height: 24px; border-radius: 50%; background: var(--card);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: var(--text-muted); flex-shrink: 0;
}
.set-row.done .set-num { background: var(--accent); color: #000; }
.set-input {
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  border-radius: var(--radius-sm); padding: 7px 6px; text-align: center;
  font-size: 15px; font-weight: 700; width: 100%; outline: none;
  font-family: var(--mono); transition: border-color var(--anim);
}
.set-input:focus { border-color: var(--accent); }
.set-input:disabled { opacity: 0.5; cursor: not-allowed; }
.set-check-btn {
  width: 34px; height: 34px; border-radius: var(--radius-sm);
  background: var(--card); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--anim);
}
.set-check-btn:hover { border-color: var(--accent); color: var(--accent); }
.set-row.done .set-check-btn { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }

/* ── Rest Timer ── */
.rest-timer {
  position: fixed; bottom: calc(var(--bottom-nav-h) + 12px); right: 16px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 14px 20px;
  text-align: center; z-index: 80; box-shadow: var(--shadow-lg);
  min-width: 120px;
}
.rest-timer.hidden { display: none; }
.timer-label { font-size: 10px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); font-weight: 700; }
.timer-val { font-size: 42px; font-weight: 800; letter-spacing: -2px; font-family: var(--mono); color: var(--accent); line-height: 1.1; }
.timer-close { font-size: 11px; color: var(--text-muted); cursor: pointer; margin-top: 6px; }
.timer-close:hover { color: var(--text); }

/* ── Progress Chart ── */
.chart-wrap { position: relative; height: 200px; }
.chart-wrap canvas { width: 100% !important; }

/* ── Empty State ── */
.empty-state { text-align: center; padding: 56px 24px; color: var(--text-muted); }
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-title { font-size: 18px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.empty-desc { font-size: 14px; margin-bottom: 20px; }

/* ── Section Header ── */
.section-hd { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.section-title { font-size: 17px; font-weight: 700; }

/* ── Program Cards ── */
.program-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 18px;
  cursor: pointer; transition: border-color var(--anim), transform var(--anim);
}
.program-card:hover { border-color: #3a3a3a; transform: translateY(-1px); }
.program-card.active-card { border-color: var(--accent); background: linear-gradient(135deg, var(--card) 0%, rgba(198,255,46,0.04) 100%); }
.program-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.program-meta { font-size: 12px; color: var(--text-muted); }
.program-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border); }

/* ── Workout Day Picker ── */
.day-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 8px;
}

.day-picker-btn {
  width: 100%;
  min-height: 40px;
  justify-content: center;
  text-align: center;
  white-space: normal;
  line-height: 1.25;
}

/* ── Session History Item ── */
.session-item {
  display: flex; align-items: flex-start; gap: 14px; padding: 16px 0;
  border-bottom: 1px solid var(--border); cursor: pointer;
  transition: padding-left var(--anim);
}
.session-item:hover { padding-left: 6px; }
.session-item:last-child { border-bottom: none; }
.session-date-badge {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 6px 10px; text-align: center;
  min-width: 48px; flex-shrink: 0;
}
.session-date-day { font-size: 20px; font-weight: 800; line-height: 1; }
.session-date-mon { font-size: 10px; text-transform: uppercase; color: var(--text-muted); letter-spacing: 1px; }
.session-info { flex: 1; min-width: 0; }
.session-name { font-weight: 700; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-detail { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.session-volume { font-size: 14px; font-weight: 700; color: var(--accent); }

/* ── Workout Header ── */
.workout-header {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  position: sticky; top: 0; z-index: 20;
}
.workout-title { font-size: 20px; font-weight: 800; }
.workout-meta { font-size: 13px; color: var(--text-muted); }

/* ── Day Tabs ── */
.day-tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; }
.day-tab {
  padding: 8px 16px; border-radius: var(--radius-md);
  background: var(--surface); border: 1px solid var(--border);
  font-size: 13px; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: all var(--anim);
}
.day-tab.active { background: var(--accent); color: #000; border-color: var(--accent); }
.day-tab:hover:not(.active) { border-color: #3a3a3a; }

/* ── Toggle ── */
.toggle { position: relative; display: inline-block; width: 42px; height: 24px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track {
  position: absolute; cursor: pointer; inset: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 99px; transition: var(--anim);
}
.toggle input:checked + .toggle-track { background: var(--accent); border-color: var(--accent); }
.toggle-track::after {
  content: ""; position: absolute; height: 18px; width: 18px;
  left: 2px; top: 2px; background: #fff; border-radius: 50%; transition: var(--anim);
}
.toggle input:checked + .toggle-track::after { left: 21px; background: #000; }

/* ── Chips ── */
.chip-list { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 100px; padding: 4px 10px; font-size: 12px; font-weight: 500;
}

.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 8px;
}

.list-item:hover {
  border-color: #3a3a3a;
  background: var(--card);
}

/* ── Search box ── */
.search-box {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 9px 13px;
  transition: border-color var(--anim);
}
.search-box:focus-within { border-color: var(--accent); }
.search-box input { background: none; border: none; outline: none; color: var(--text); flex: 1; font-size: 14px; font-family: var(--font); }
.search-box input::placeholder { color: var(--text-dim); }

/* ── Skeleton Loader ── */
.skeleton {
  background: linear-gradient(90deg, var(--card) 25%, var(--card-hover) 50%, var(--card) 75%);
  background-size: 200%; animation: shimmer 1.4s infinite;
  border-radius: var(--radius-sm); height: 14px;
}
.skeleton-h { height: 28px; width: 45%; }
.skeleton-card { height: 90px; border-radius: var(--radius-lg); }
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #3d3d3d; }

/* ── Utilities ── */
.divider { height: 1px; background: var(--border); margin: 18px 0; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 4px; }
.gap-6 { gap: 6px; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-sm { font-size: 13px; }
.text-xs { font-size: 11px; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.truncate { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.hidden { display: none !important; }

/* ── Animations ── */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.fade-in { animation: fadeIn 0.2s ease; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none !important; }
  .bottom-nav { display: block; }
  .main-content { padding-bottom: calc(var(--bottom-nav-h) + 8px); }
  .page { padding: 20px 16px; }
  .stat-grid-3, .stat-grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .page-header { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .stat-grid-3 { grid-template-columns: 1fr; }
  .page-title { font-size: 23px; }
  .auth-card { padding: 28px 18px; }
  .set-cols-header, .set-row { grid-template-columns: 24px 1fr 1fr 34px; }
  .set-cols-header span:nth-child(3), .set-row .set-rir { display: none; }
}

/* ════════════════════════════════════════════════════════════════
   COMPREHENSIVE MOBILE RESPONSIVE DESIGN
   ════════════════════════════════════════════════════════════════ */

/* TABLET & DESKTOP BREAKPOINT: 769px+ ── */
@media (max-width: 1024px) {
  .page { max-width: 100%; }
}

/* TABLET BREAKPOINT: 481px–768px ── */
@media (max-width: 768px) {
  :root { --sidebar-w: 0; --bottom-nav-h: 72px; }
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none !important; }
  .bottom-nav { display: flex !important; height: var(--bottom-nav-h); }
  .main-content { padding-bottom: calc(var(--bottom-nav-h) + 8px); }
  .page { padding: 24px 16px 32px; max-width: 100%; }
  .page-title { font-size: 26px; }
  .page-header { flex-direction: column; align-items: flex-start; }
  .stat-grid-3, .stat-grid-4 { grid-template-columns: 1fr 1fr; }
  .stat-grid-2 { grid-template-columns: 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .card { padding: 18px; }
  .card-sm { padding: 12px 14px; }
  .btn { min-height: 44px; padding: 12px 16px; font-size: 15px; }
  .btn-sm { min-height: 40px; padding: 8px 12px; }
  .modal { max-height: 90vh; }
  .modal-overlay { padding: 16px; }
  .form-control { padding: 13px 14px; font-size: 16px; }
  .set-cols-header { grid-template-columns: 28px 1fr 1fr 1fr 44px; padding: 10px 12px; }
  .set-row { grid-template-columns: 28px 1fr 1fr 1fr 44px; padding: 10px 12px; }
  .set-check-btn { width: 44px; height: 44px; }
  .day-tabs { gap: 10px; padding: 12px 0; }
  .day-tab { padding: 10px 14px; font-size: 14px; min-height: 40px; }
  .rest-timer { bottom: calc(var(--bottom-nav-h) + 16px); left: 16px; right: auto; min-width: 130px; }
  .session-item { padding: 18px 0; gap: 16px; }
}

/* PHONE BREAKPOINT: 320px–480px ── */
@media (max-width: 480px) {
  :root { --topbar-h: 54px; --bottom-nav-h: 76px; --radius-lg: 12px; --radius-xl: 16px; }
  html { font-size: 14px; }
  body { line-height: 1.6; }
  .page { padding: 20px 14px 28px; margin: 0; }
  .page-title { font-size: 22px; font-weight: 800; }
  .page-subtitle { font-size: 13px; margin-top: 3px; }
  h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; word-break: break-word; }
  .card { padding: 16px; border-radius: var(--radius-lg); }
  .card + .card { margin-top: 14px; }
  .card-sm { padding: 12px 14px; }
  .card-title { font-size: 15px; }
  .stat-card { padding: 16px 14px; border-radius: var(--radius-lg); }
  .stat-grid-2, .stat-grid-3, .stat-grid-4 { grid-template-columns: 1fr; gap: 10px; }
  .stat-value { font-size: 28px; letter-spacing: -0.5px; }
  .stat-label { font-size: 10px; letter-spacing: 0.8px; }
  .btn { min-height: 48px; padding: 14px 16px; font-size: 15px; font-weight: 600; }
  .btn-full { width: 100%; }
  .btn-lg { min-height: 48px; padding: 14px 20px; font-size: 16px; }
  .btn-sm { min-height: 40px; padding: 10px 12px; font-size: 13px; }
  .form-group { margin-bottom: 18px; }
  .form-label { font-size: 13px; margin-bottom: 8px; font-weight: 600; }
  .form-control { padding: 14px 14px; font-size: 16px; min-height: 44px; }
  select.form-control { padding: 12px 14px; }
  .form-error { font-size: 12px; margin-top: 6px; }
  .input-group { gap: 10px; flex-direction: column; }
  .input-group .form-control { width: 100%; }
  .input-group .btn { width: 100%; }
  .auth-page { padding: 20px 16px; }
  .auth-card { max-width: 100%; padding: 24px 18px; border-radius: var(--radius-lg); }
  .auth-logo { margin-bottom: 24px; }
  .auth-logo-mark { width: 56px; height: 56px; font-size: 28px; margin-bottom: 12px; }
  .auth-title { font-size: 22px; margin-bottom: 4px; }
  .auth-subtitle { font-size: 13px; }
  .set-cols-header { grid-template-columns: 28px 1fr 1fr 44px; gap: 6px; padding: 9px 10px; font-size: 9px; }
  .set-row { grid-template-columns: 28px 1fr 1fr 44px; gap: 6px; padding: 9px 10px; }
  .set-cols-header span:nth-child(4), .set-row .set-rpe { display: none; }
  .set-num { width: 22px; height: 22px; font-size: 10px; }
  .set-input { padding: 8px 6px; font-size: 14px; }
  .set-check-btn { width: 44px; height: 44px; font-size: 18px; }
  .exercise-card-header { gap: 12px; padding: 14px 12px; flex-wrap: wrap; }
  .ex-name { font-size: 15px; }
  .ex-meta { font-size: 12px; }
  .day-tabs { gap: 8px; padding: 14px 0; -webkit-overflow-scrolling: touch; }
  .day-tab { padding: 10px 14px; font-size: 13px; min-height: 42px; }
  .badge { padding: 4px 8px; font-size: 10px; }
  .pr-badge { padding: 2px 6px; font-size: 9px; }
  .table { font-size: 13px; }
  .table th, .table td { padding: 10px 10px; font-size: 12px; }
  .table th { font-size: 10px; }
  .alert { padding: 12px 14px; font-size: 13px; }
  .modal { max-width: 100%; max-height: 92vh; border-radius: var(--radius-lg); }
  .modal-overlay { padding: 12px; align-items: flex-end; }
  .modal-header { padding: 16px 16px; }
  .modal-title { font-size: 17px; }
  .modal-body { padding: 18px 16px; }
  .modal-footer { padding: 12px 16px; gap: 10px; flex-wrap: wrap; }
  .modal-footer .btn { flex: 1; min-width: 120px; }
  .session-item { padding: 16px 0; gap: 12px; }
  .session-date-badge { min-width: 52px; padding: 8px 10px; }
  .session-date-day { font-size: 18px; }
  .session-date-mon { font-size: 9px; }
  .session-name { font-size: 14px; }
  .session-detail { font-size: 12px; margin-top: 3px; }
  .workout-header { padding: 14px 16px; flex-wrap: wrap; }
  .workout-title { font-size: 18px; }
  .workout-meta { font-size: 12px; }
  .program-card { padding: 16px; border-radius: var(--radius-lg); }
  .day-picker-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .program-name { font-size: 15px; margin-bottom: 3px; }
  .program-meta { font-size: 11px; }
  .program-footer { margin-top: 12px; padding-top: 10px; }
  .empty-state { padding: 48px 18px; }
  .empty-icon { font-size: 40px; margin-bottom: 10px; }
  .empty-title { font-size: 16px; margin-bottom: 4px; }
  .empty-desc { font-size: 13px; margin-bottom: 16px; }
  .rest-timer { bottom: calc(var(--bottom-nav-h) + 12px); right: 12px; left: auto; padding: 12px 16px; min-width: 110px; }
  .timer-val { font-size: 36px; letter-spacing: -1.5px; }
  .timer-label { font-size: 9px; }
  .bottom-nav { display: flex !important; }
  .bn-item { gap: 3px; padding: 6px 10px; min-height: 60px; }
  .bn-icon { font-size: 22px; }
  .section-title { font-size: 16px; }
  .list-item { padding: 12px 12px; margin-bottom: 8px; }
  .search-box { padding: 11px 12px; }
  .search-box input { font-size: 15px; }
  .chip-list { gap: 8px; }
  .chip { padding: 6px 10px; font-size: 12px; }
  .divider { margin: 16px 0; }
  .toggle { width: 48px; height: 28px; }
  .toggle-track { border-radius: 99px; }
  .toggle-track::after { width: 22px; height: 22px; top: 2px; left: 2px; }
  .toggle input:checked + .toggle-track::after { left: 24px; }
}

  @media (max-width: 480px) {
    .day-picker-grid { grid-template-columns: 1fr; }
    .day-picker-btn { min-height: 44px; }
  }