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

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #f9f8f6;
  --bg1:       #ffffff;
  --bg2:       #f4f3f0;
  --bg3:       #ece9e3;
  --border:    #e8e4de;
  --border2:   #d4cec8;
  --primary:   #d4500a;
  --primary-l: #ea6c2a;
  --primary-bg:#fff4ee;
  --gold:      #b45309;
  --gold-bg:   #fffbeb;
  --text:      #1a1714;
  --text2:     #57534e;
  --text3:     #a8a29e;
  --green:     #15803d;
  --green-bg:  #f0fdf4;
  --red:       #dc2626;
  --red-bg:    #fef2f2;
  --blue:      #1d4ed8;
  --blue-bg:   #eff6ff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 4px 16px rgba(0,0,0,.08),0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);
  --radius:    8px;
  --radius-lg: 12px;
  --nav-w:     230px;
}

body.dark {
  --bg:        #0d0d0d;
  --bg1:       #141414;
  --bg2:       #1c1c1c;
  --bg3:       #252525;
  --border:    #2a2a2a;
  --border2:   #383838;
  --primary:   #f97316;
  --primary-l: #fb923c;
  --primary-bg:rgba(249,115,22,.08);
  --gold:      #fbbf24;
  --gold-bg:   rgba(251,191,36,.08);
  --text:      #f5f5f4;
  --text2:     #a8a29e;
  --text3:     #57534e;
  --green:     #4ade80;
  --green-bg:  rgba(74,222,128,.08);
  --red:       #f87171;
  --red-bg:    rgba(248,113,113,.08);
  --blue:      #60a5fa;
  --blue-bg:   rgba(96,165,250,.08);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
  --shadow:    0 4px 16px rgba(0,0,0,.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.6);
}

html { scroll-behavior: smooth; }
body { background:var(--bg); color:var(--text); font-family:'Geist',system-ui,sans-serif; font-size:14px; line-height:1.6; min-height:100vh; transition:background .2s,color .2s; }

::-webkit-scrollbar { width:5px; height:5px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--border2); border-radius:99px; }

/* AUTH */
#auth-screen { display:flex; align-items:center; justify-content:center; min-height:100vh; padding:20px; background:var(--bg); }
.auth-box { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); padding:40px; width:100%; max-width:400px; box-shadow:var(--shadow); }
.auth-logo { font-size:28px; font-weight:700; color:var(--primary); letter-spacing:-.5px; text-align:center; margin-bottom:4px; }
.auth-sub { text-align:center; color:var(--text3); font-size:13px; margin-bottom:28px; }
.auth-tabs { display:flex; gap:4px; background:var(--bg2); border-radius:var(--radius); padding:4px; margin-bottom:24px; border:1px solid var(--border); }
.auth-tab { flex:1; text-align:center; padding:7px; border-radius:6px; cursor:pointer; color:var(--text2); font-size:13px; font-weight:500; transition:all .15s; }
.auth-tab.active { background:var(--bg1); color:var(--text); box-shadow:var(--shadow-sm); font-weight:600; }

/* LAYOUT */
#app { display:none; min-height:100vh; }
#app.visible { display:flex; }
nav { width:var(--nav-w); background:var(--bg1); border-right:1px solid var(--border); display:flex; flex-direction:column; height:100vh; position:fixed; top:0; left:0; z-index:100; transition:transform .25s,background .2s,border-color .2s; overflow-y:auto; }
.nav-logo { padding:18px 16px 14px; border-bottom:1px solid var(--border); display:flex; align-items:center; gap:8px; justify-content:space-between; }
.nav-logo-left { display:flex; flex-direction:column; }
.nav-logo-text { font-size:18px; font-weight:700; color:var(--primary); letter-spacing:-.3px; }
.nav-logo-sub { font-size:10px; color:var(--text3); letter-spacing:.5px; text-transform:uppercase; }
.theme-toggle { width:30px; height:30px; border-radius:6px; border:1px solid var(--border); background:var(--bg2); cursor:pointer; display:flex; align-items:center; justify-content:center; font-size:14px; transition:all .15s; flex-shrink:0; }
.theme-toggle:hover { background:var(--bg3); }
.nav-links { flex:1; padding:10px 8px; }
.nav-link { display:flex; align-items:center; gap:10px; padding:8px 10px; border-radius:6px; cursor:pointer; color:var(--text2); font-size:13px; font-weight:500; transition:all .12s; margin-bottom:1px; border:none; background:none; width:100%; text-align:left; }
.nav-link:hover { background:var(--bg2); color:var(--text); }
.nav-link.active { background:var(--primary-bg); color:var(--primary); font-weight:600; }
.nav-link .icon { font-size:15px; width:20px; text-align:center; flex-shrink:0; }
.nav-section { font-size:10px; color:var(--text3); letter-spacing:1px; text-transform:uppercase; padding:12px 10px 4px; margin-top:4px; }
.nav-user { padding:12px; border-top:1px solid var(--border); }
.nav-avatar { width:32px; height:32px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:13px; font-weight:700; color:#fff; flex-shrink:0; overflow:hidden; }
.nav-avatar img { width:100%; height:100%; object-fit:cover; }
.nav-user-info { display:flex; align-items:center; gap:8px; }
.nav-username { font-size:13px; font-weight:600; color:var(--text); }
.nav-role { font-size:11px; color:var(--text3); }
.nav-logout { background:none; border:none; color:var(--text3); cursor:pointer; font-size:16px; margin-left:auto; transition:color .15s; padding:4px 6px; border-radius:4px; }
.nav-logout:hover { color:var(--red); background:var(--red-bg); }
main { margin-left:var(--nav-w); flex:1; padding:28px 32px; min-height:100vh; }
.page { display:none; }
.page.active { display:block; }
.page-header { display:flex; align-items:flex-end; justify-content:space-between; margin-bottom:24px; gap:14px; flex-wrap:wrap; }
.page-title { font-size:22px; font-weight:700; color:var(--text); letter-spacing:-.3px; }
.page-sub { color:var(--text3); font-size:13px; margin-top:2px; }
.hamburger { display:none; position:fixed; top:14px; left:14px; z-index:200; background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius); padding:7px 10px; cursor:pointer; font-size:16px; color:var(--text); box-shadow:var(--shadow-sm); }
.nav-overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,.3); z-index:99; backdrop-filter:blur(2px); }

/* CARDS */
.card { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); padding:20px; box-shadow:var(--shadow-sm); transition:background .2s,border-color .2s; }
.card-title { font-size:11px; font-weight:700; color:var(--text3); text-transform:uppercase; letter-spacing:.8px; margin-bottom:14px; }
.grid-2 { display:grid; grid-template-columns:repeat(2,1fr); gap:14px; }
.grid-3 { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.grid-4 { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
.stat-card { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); padding:18px 20px; box-shadow:var(--shadow-sm); }
.stat-value { font-size:30px; font-weight:700; color:var(--text); letter-spacing:-.5px; line-height:1; font-variant-numeric:tabular-nums; }
.stat-label { font-size:11px; color:var(--text3); text-transform:uppercase; letter-spacing:.8px; margin-top:4px; font-weight:600; }

/* BUTTONS */
.btn { display:inline-flex; align-items:center; gap:6px; padding:8px 16px; border-radius:var(--radius); border:1px solid transparent; cursor:pointer; font-family:'Geist',sans-serif; font-size:13px; font-weight:500; transition:all .12s; text-decoration:none; white-space:nowrap; line-height:1.4; }
.btn-primary { background:var(--primary); color:#fff; border-color:var(--primary); }
.btn-primary:hover { background:var(--primary-l); border-color:var(--primary-l); transform:translateY(-1px); box-shadow:0 4px 12px rgba(212,80,10,.2); }
.btn-ghost { background:transparent; border-color:var(--border2); color:var(--text2); }
.btn-ghost:hover { background:var(--bg2); color:var(--text); }
.btn-danger { background:var(--red-bg); border-color:transparent; color:var(--red); }
.btn-danger:hover { background:#fecaca; }
.btn-success { background:var(--green-bg); border-color:transparent; color:var(--green); }
.btn-success:hover { background:#bbf7d0; }
.btn-gold { background:var(--gold-bg); border-color:transparent; color:var(--gold); }
.btn-gold:hover { background:#fde68a; }
.btn-sm { padding:5px 12px; font-size:12px; }
.btn-icon { padding:6px 8px; }
.btn:disabled { opacity:.4; cursor:not-allowed; transform:none !important; box-shadow:none !important; }

/* FORMS */
.form-group { margin-bottom:16px; }
.form-label { display:block; font-size:12px; font-weight:600; color:var(--text2); margin-bottom:5px; }
.form-input, .form-select, .form-textarea { width:100%; background:var(--bg1); border:1px solid var(--border2); border-radius:var(--radius); padding:8px 12px; color:var(--text); font-family:'Geist',sans-serif; font-size:13px; transition:border-color .12s,box-shadow .12s; outline:none; }
body.dark .form-input, body.dark .form-select, body.dark .form-textarea { background:var(--bg2); }
.form-input:focus, .form-select:focus, .form-textarea:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(212,80,10,.1); }
.form-select { cursor:pointer; }
.form-textarea { resize:vertical; min-height:80px; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.form-row-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:12px; }
.form-error { color:var(--red); font-size:12px; margin-top:6px; }
.form-hint { color:var(--text3); font-size:11px; margin-top:4px; }

/* BADGES */
.badge { display:inline-flex; align-items:center; padding:2px 8px; border-radius:99px; font-size:11px; font-weight:600; }
.badge-primary { background:var(--primary-bg); color:var(--primary); }
.badge-green   { background:var(--green-bg); color:var(--green); }
.badge-gold    { background:var(--gold-bg); color:var(--gold); }
.badge-blue    { background:var(--blue-bg); color:var(--blue); }
.badge-gray    { background:var(--bg2); color:var(--text2); border:1px solid var(--border); }

/* TABLE */
.table-wrap { overflow-x:auto; border-radius:var(--radius); border:1px solid var(--border); }
table { width:100%; border-collapse:collapse; }
th { font-size:11px; font-weight:700; color:var(--text3); text-transform:uppercase; letter-spacing:.8px; padding:10px 14px; text-align:left; background:var(--bg2); border-bottom:1px solid var(--border); }
td { padding:10px 14px; border-bottom:1px solid var(--border); font-size:13px; color:var(--text2); }
tr:last-child td { border-bottom:none; }
tbody tr:hover td { background:var(--bg2); color:var(--text); }

/* EXERCISE CARD */
.exercise-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(240px,1fr)); gap:12px; }
.exercise-card { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); overflow:hidden; cursor:pointer; transition:all .15s; box-shadow:var(--shadow-sm); }
.exercise-card:hover { border-color:var(--primary); box-shadow:var(--shadow); transform:translateY(-2px); }
.exercise-img { width:100%; height:110px; background:var(--bg2); display:flex; align-items:center; justify-content:center; font-size:40px; }
.exercise-img img { width:100%; height:100%; object-fit:cover; }
.exercise-info { padding:12px; }
.exercise-name { font-weight:600; font-size:13px; margin-bottom:6px; color:var(--text); }
.exercise-meta { display:flex; gap:4px; flex-wrap:wrap; }

/* WORKOUT LIST */
.workout-item { display:flex; align-items:center; gap:14px; background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); padding:14px 16px; margin-bottom:8px; cursor:pointer; transition:all .12s; box-shadow:var(--shadow-sm); }
.workout-item:hover { border-color:var(--border2); box-shadow:var(--shadow); }
.workout-date-box { text-align:center; min-width:42px; }
.workout-date-day { font-size:24px; font-weight:700; color:var(--primary); line-height:1; }
.workout-date-mon { font-size:10px; color:var(--text3); text-transform:uppercase; letter-spacing:.5px; }
.workout-info { flex:1; }
.workout-name { font-weight:600; font-size:14px; color:var(--text); }
.workout-meta { font-size:12px; color:var(--text3); margin-top:2px; }
.workout-status { padding:3px 9px; border-radius:99px; font-size:11px; font-weight:600; }
.status-completed  { background:var(--green-bg); color:var(--green); }
.status-planned    { background:var(--blue-bg); color:var(--blue); }
.status-in_progress { background:var(--gold-bg); color:var(--gold); }

/* ACTIVE SESSION */
.workout-session { max-width:820px; }
.session-header { display:flex; align-items:center; justify-content:space-between; background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); padding:18px 22px; margin-bottom:16px; box-shadow:var(--shadow-sm); }
.session-title { font-size:18px; font-weight:700; letter-spacing:-.3px; }
.session-timer { font-size:28px; font-weight:700; color:var(--primary); font-family:'Geist Mono',monospace; }
.exercise-block { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); margin-bottom:12px; overflow:hidden; box-shadow:var(--shadow-sm); }
.exercise-block-header { display:flex; align-items:center; gap:12px; padding:14px 16px; border-bottom:1px solid var(--border); background:var(--bg2); }
.exercise-block-num { font-size:18px; font-weight:700; color:var(--primary); min-width:24px; }
.exercise-block-name { font-weight:600; font-size:14px; flex:1; color:var(--text); }
.exercise-block-mg { font-size:11px; color:var(--text3); margin-top:1px; }
.sets-table { width:100%; border-collapse:collapse; }
.sets-table th { font-size:10px; color:var(--text3); letter-spacing:.8px; text-transform:uppercase; padding:8px 12px; border-bottom:1px solid var(--border); background:var(--bg2); font-weight:700; }
.sets-table td { padding:7px 12px; border-bottom:1px solid var(--border); }
.sets-table tr:last-child td { border-bottom:none; }
.set-input { width:68px; background:var(--bg2); border:1px solid var(--border2); border-radius:6px; padding:5px 8px; color:var(--text); font-size:13px; text-align:center; outline:none; font-family:'Geist Mono',monospace; }
.set-input:focus { border-color:var(--primary); box-shadow:0 0 0 2px rgba(212,80,10,.1); }
.set-row.done td { opacity:.6; }
.easy-btn { background:none; border:1px solid var(--border2); border-radius:5px; padding:4px 8px; font-size:11px; color:var(--text3); cursor:pointer; transition:all .12s; white-space:nowrap; font-family:'Geist',sans-serif; }
.easy-btn.active { background:var(--gold-bg); border-color:var(--gold); color:var(--gold); }
.done-btn { background:none; border:1px solid var(--border2); border-radius:5px; padding:5px 10px; font-size:13px; cursor:pointer; transition:all .12s; color:var(--text3); }
.done-btn.completed { background:var(--green-bg); border-color:var(--green); color:var(--green); }
.rest-timer { background:var(--primary-bg); border:1px solid rgba(212,80,10,.15); border-radius:6px; padding:8px 14px; display:flex; align-items:center; gap:10px; font-size:13px; color:var(--primary); }
.rest-timer-count { font-size:22px; font-weight:700; color:var(--primary); min-width:50px; font-family:'Geist Mono',monospace; }

/* CALENDAR */
.cal-wrap { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-sm); }
.cal-header { display:flex; align-items:center; justify-content:space-between; padding:14px 18px; border-bottom:1px solid var(--border); background:var(--bg2); }
.cal-month { font-size:15px; font-weight:700; color:var(--text); letter-spacing:-.2px; }
.cal-grid { display:grid; grid-template-columns:repeat(7,1fr); }
.cal-day-name { text-align:center; padding:8px 4px; font-size:10px; font-weight:700; color:var(--text3); text-transform:uppercase; letter-spacing:.8px; border-bottom:1px solid var(--border); background:var(--bg2); }
.cal-cell { padding:6px; min-height:58px; border-right:1px solid var(--border); border-bottom:1px solid var(--border); cursor:pointer; transition:background .1s; }
.cal-cell:nth-child(7n) { border-right:none; }
.cal-cell:hover { background:var(--bg2); }
.cal-cell.other-month .cal-num { opacity:.3; }
.cal-cell.today .cal-num { color:var(--primary); font-weight:700; }
.cal-num { font-size:12px; font-weight:500; color:var(--text2); margin-bottom:3px; }
.cal-dots { display:flex; flex-wrap:wrap; gap:3px; }
.cal-dot { width:6px; height:6px; border-radius:50%; }
.cal-dot.completed { background:var(--green); }
.cal-dot.planned   { background:var(--blue); }
.cal-dot.in_progress { background:var(--gold); }

/* CHARTS */
.chart-wrap { position:relative; height:240px; }
.chart-wrap canvas { max-height:240px; }

/* TEMPLATE EDITOR */
.template-day-block { background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius-lg); padding:16px; margin-bottom:10px; }
.template-day-header { display:flex; align-items:center; gap:10px; margin-bottom:12px; flex-wrap:wrap; }
.template-day-num { font-size:16px; font-weight:700; color:var(--primary); min-width:60px; }

/* SUGGESTIONS */
.suggestion-card { display:flex; align-items:center; gap:12px; background:var(--gold-bg); border:1px solid rgba(180,83,9,.15); border-radius:var(--radius); padding:12px 16px; margin-bottom:8px; }
.suggestion-icon { font-size:20px; }
.suggestion-info { flex:1; }
.suggestion-ex { font-weight:600; font-size:13px; color:var(--text); }
.suggestion-text { font-size:12px; color:var(--text2); margin-top:1px; }

/* AVATAR UPLOAD */
.avatar-upload-wrap { position:relative; width:80px; height:80px; cursor:pointer; }
.avatar-lg { width:80px; height:80px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:28px; font-weight:700; color:#fff; overflow:hidden; border:3px solid var(--border); }
.avatar-lg img { width:100%; height:100%; object-fit:cover; }
.avatar-upload-overlay { position:absolute; inset:0; border-radius:50%; background:rgba(0,0,0,.45); display:flex; align-items:center; justify-content:center; opacity:0; transition:opacity .15s; font-size:18px; }
.avatar-upload-wrap:hover .avatar-upload-overlay { opacity:1; }

.body-stat-entry { display:flex; align-items:center; gap:12px; padding:10px 0; border-bottom:1px solid var(--border); }
.body-stat-date { font-size:12px; color:var(--text3); min-width:90px; }
.body-stat-values { display:flex; gap:20px; flex:1; flex-wrap:wrap; }
.body-stat-val { font-size:13px; color:var(--text2); }
.body-stat-val strong { font-weight:700; color:var(--text); font-size:15px; }

/* MODAL */
.modal-overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,.4); z-index:500; align-items:center; justify-content:center; padding:20px; backdrop-filter:blur(4px); }
.modal-overlay.open { display:flex; }
.modal { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius-lg); width:100%; max-width:560px; max-height:90vh; overflow-y:auto; box-shadow:var(--shadow-lg); }
.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(--bg1); z-index:1; }
.modal-title { font-size:16px; font-weight:700; letter-spacing:-.2px; }
.modal-close { background:none; border:none; color:var(--text2); font-size:18px; cursor:pointer; padding:3px 6px; border-radius:5px; transition:all .12s; }
.modal-close:hover { color:var(--text); background:var(--bg2); }
.modal-body { padding:22px; }
.modal-footer { padding:14px 22px; border-top:1px solid var(--border); display:flex; gap:8px; justify-content:flex-end; background:var(--bg2); border-radius:0 0 var(--radius-lg) var(--radius-lg); }

/* TOAST */
.toast-wrap { position:fixed; bottom:20px; right:20px; z-index:9999; display:flex; flex-direction:column; gap:6px; pointer-events:none; }
.toast { background:var(--bg1); border:1px solid var(--border); border-radius:var(--radius); padding:10px 16px; font-size:13px; color:var(--text); pointer-events:all; box-shadow:var(--shadow); display:flex; align-items:center; gap:8px; min-width:220px; animation:slideIn .2s ease; }
.toast.success { border-left:3px solid var(--green); }
.toast.error   { border-left:3px solid var(--red); }
.toast.info    { border-left:3px solid var(--primary); }
@keyframes slideIn { from { transform:translateX(110%); opacity:0; } to { transform:translateX(0); opacity:1; } }

/* MISC */
.empty { text-align:center; padding:48px 20px; color:var(--text3); }
.empty-icon { font-size:40px; margin-bottom:10px; }
.empty-text { font-size:15px; font-weight:500; color:var(--text2); }
.empty-sub { font-size:13px; margin-top:4px; }
.divider { border:none; border-top:1px solid var(--border); margin:20px 0; }
.color-swatch { width:26px; height:26px; border-radius:50%; border:2px solid transparent; cursor:pointer; transition:transform .12s; }
.color-swatch:hover, .color-swatch.selected { transform:scale(1.2); border-color:var(--text); }
.tag { display:inline-flex; align-items:center; gap:4px; padding:2px 8px; background:var(--bg2); border:1px solid var(--border); border-radius:99px; font-size:11px; color:var(--text2); }
.tabs { display:flex; gap:3px; background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius); padding:3px; margin-bottom:20px; flex-wrap:wrap; }
.tab-btn { padding:6px 14px; border-radius:6px; border:none; background:none; color:var(--text2); cursor:pointer; font-family:'Geist',sans-serif; font-size:13px; font-weight:500; transition:all .12s; }
.tab-btn.active { background:var(--bg1); color:var(--text); box-shadow:var(--shadow-sm); font-weight:600; }
.progress-bar-wrap { background:var(--bg3); border-radius:99px; height:5px; overflow:hidden; }
.progress-bar-fill { height:100%; background:var(--primary); border-radius:99px; transition:width .3s; }
.video-wrap { position:relative; padding-bottom:56.25%; height:0; border-radius:var(--radius); overflow:hidden; margin-bottom:14px; border:1px solid var(--border); }
.video-wrap iframe { position:absolute; top:0; left:0; width:100%; height:100%; }
.diff-beginner    { color:var(--green); font-weight:600; }
.diff-intermediate { color:var(--gold); font-weight:600; }
.diff-advanced    { color:var(--red); font-weight:600; }
.filter-bar { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:16px; align-items:center; }
.filter-bar .form-input { max-width:260px; }
.filter-bar .form-select { max-width:170px; width:auto; }
.action-row { display:flex; gap:8px; flex-wrap:wrap; align-items:center; padding:14px; background:var(--bg2); border-radius:var(--radius); border:1px solid var(--border); }
.section-title { font-size:11px; font-weight:700; color:var(--text3); text-transform:uppercase; letter-spacing:.8px; margin-bottom:10px; margin-top:20px; }

@media (max-width:900px) {
  nav { transform:translateX(-100%); }
  nav.open { transform:translateX(0); }
  .nav-overlay.open { display:block; }
  .hamburger { display:flex; align-items:center; }
  main { margin-left:0; padding:16px; padding-top:54px; }
  .grid-4 { grid-template-columns:repeat(2,1fr); }
  .grid-3 { grid-template-columns:repeat(2,1fr); }
  .page-header { flex-direction:column; align-items:flex-start; }
}
@media (max-width:600px) {
  .grid-4,.grid-3,.grid-2 { grid-template-columns:1fr; }
  .form-row,.form-row-3 { grid-template-columns:1fr; }
  .exercise-grid { grid-template-columns:1fr; }
  .filter-bar { flex-direction:column; align-items:stretch; }
  .filter-bar .form-input,.filter-bar .form-select { max-width:none; }
  .session-header { flex-direction:column; gap:10px; align-items:flex-start; }
  main { padding:12px; padding-top:52px; }
  .auth-box { padding:28px 20px; }
}