/* =========================================================
   DESIGN TOKENS
   ========================================================= */
:root {
    --bg:               #0e1014;
    --surface:          #171a20;
    --surface-elevated: #1e2128;
    --border:           #272c38;
    --border-subtle:    #1f2330;

    --accent:           #d4a843;
    --accent-dim:       rgba(212, 168, 67, 0.10);
    --accent-hover:     #e0b84e;

    --text:             #e8eaed;
    --text-secondary:   #9aa0ad;
    --text-muted:       #555b68;

    --success:          #3ecf8e;
    --success-dim:      rgba(62, 207, 142, 0.10);
    --error:            #f26666;
    --error-dim:        rgba(242, 102, 102, 0.10);
    --warning:          #f59e0b;

    --nav-width:        220px;
    --radius:           6px;
    --radius-lg:        10px;

    --font-display:     'Space Grotesk', system-ui, sans-serif;
    --font-body:        'Inter', system-ui, sans-serif;
    --font-mono:        'JetBrains Mono', 'Courier New', monospace;

    --transition:       150ms ease;
}

/* =========================================================
   RESET AND BASE
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
    background:  var(--bg);
    color:       var(--text);
    font-family: var(--font-body);
    font-size:   0.9375rem;
    line-height: 1.6;
    min-height:  100vh;
}

a    { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.25;
}

code {
    font-family: var(--font-mono);
    background:  var(--surface-elevated);
    border:      1px solid var(--border);
    border-radius: var(--radius);
    padding:     2px 6px;
    font-size:   0.875rem;
}

/* =========================================================
   LAYOUT
   ========================================================= */
.sidebar {
    position:   fixed;
    top:        0;
    left:       0;
    bottom:     0;
    width:      var(--nav-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display:    flex;
    flex-direction: column;
    z-index:    100;
    overflow-y: auto;
}

.main-content {
    margin-left: var(--nav-width);
    min-height:  100vh;
    padding:     36px 40px;
    max-width:   calc(900px + var(--nav-width));
}

/* =========================================================
   SIDEBAR NAVIGATION
   ========================================================= */
.sidebar-brand {
    display:     flex;
    align-items: center;
    gap:         10px;
    padding:     28px 24px 20px;
    border-bottom: 1px solid var(--border);
}

.brand-mark {
    display:       block;
    width:         10px;
    height:        24px;
    background:    var(--accent);
    border-radius: 2px;
    flex-shrink:   0;
}

.brand-mark.large {
    width:  14px;
    height: 32px;
}

.brand-name {
    font-family: var(--font-display);
    font-size:   1.1rem;
    font-weight: 700;
    color:       var(--text);
    letter-spacing: 0.02em;
}

.nav-list {
    list-style: none;
    padding:    16px 0;
    flex:       1;
}

.nav-item a {
    display:     block;
    padding:     10px 24px;
    color:       var(--text-secondary);
    font-size:   0.9rem;
    font-weight: 500;
    transition:  color var(--transition), background var(--transition);
    border-left: 2px solid transparent;
}

.nav-item a:hover {
    color:      var(--text);
    background: var(--accent-dim);
}

.nav-item.active a {
    color:        var(--accent);
    border-color: var(--accent);
    background:   var(--accent-dim);
}

.nav-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
}

.logout-link {
    font-size:   0.875rem;
    color:       var(--text-muted);
    font-weight: 500;
}

.logout-link:hover { color: var(--error); }

/* Mobile menu toggle */
.menu-toggle {
    display:    none;
    position:   fixed;
    top:        16px;
    left:       16px;
    z-index:    200;
    background: var(--surface);
    border:     1px solid var(--border);
    border-radius: var(--radius);
    padding:    8px 10px;
    cursor:     pointer;
    flex-direction: column;
    gap:        4px;
}

.menu-toggle span {
    display:    block;
    width:      18px;
    height:     2px;
    background: var(--text);
    border-radius: 1px;
    transition: var(--transition);
}

.overlay {
    display:  none;
    position: fixed;
    inset:    0;
    background: rgba(0, 0, 0, 0.6);
    z-index:  99;
}

/* =========================================================
   PAGE STRUCTURE
   ========================================================= */
.page-header {
    display:         flex;
    align-items:     center;
    justify-content: space-between;
    margin-bottom:   32px;
    gap:             16px;
}

.page-title {
    font-size:   1.75rem;
    font-weight: 700;
    color:       var(--text);
}

.page-sub {
    color:     var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 2px;
}

/* =========================================================
   CARDS
   ========================================================= */
.card {
    background:    var(--surface);
    border:        1px solid var(--border);
    border-radius: var(--radius-lg);
    padding:       24px;
    margin-bottom: 16px;
}

.card-header {
    display:         flex;
    align-items:     center;
    justify-content: space-between;
    margin-bottom:   20px;
}

.card-title {
    font-size:   1.1rem;
    font-weight: 600;
}

.card-link {
    font-size:   0.85rem;
    font-weight: 500;
}

/* =========================================================
   STATS ROW (Dashboard)
   ========================================================= */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap:     12px;
    margin-bottom: 16px;
}

.stat-card {
    background:    var(--surface);
    border:        1px solid var(--border);
    border-radius: var(--radius-lg);
    padding:       20px 24px;
    display:       flex;
    flex-direction: column;
    gap:           6px;
}

.stat-label {
    font-size:     0.75rem;
    font-weight:   600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color:         var(--text-muted);
}

.stat-value {
    font-family:   var(--font-display);
    font-size:     1.3rem;
    font-weight:   600;
    color:         var(--text);
}

.stat-value.mono {
    font-family: var(--font-mono);
}

/* =========================================================
   SESSION LIST (Dashboard)
   ========================================================= */
.session-list { display: flex; flex-direction: column; }

.session-row {
    display:         flex;
    align-items:     center;
    justify-content: space-between;
    padding:         14px 0;
    border-bottom:   1px solid var(--border-subtle);
    color:           var(--text);
    transition:      background var(--transition);
    border-radius:   var(--radius);
    padding-inline:  8px;
}

.session-row:last-child { border-bottom: none; }

.session-row:hover {
    background: var(--accent-dim);
}

.session-info {
    display:        flex;
    flex-direction: column;
    gap:            2px;
}

.session-day {
    font-weight: 500;
    font-size:   0.9375rem;
}

.session-date {
    font-size: 0.8rem;
    color:     var(--text-muted);
}

.session-meta {
    display:     flex;
    align-items: center;
    gap:         16px;
    font-size:   0.875rem;
    color:       var(--text-secondary);
}

/* =========================================================
   HISTORY CARDS
   ========================================================= */
.session-card .session-card-header {
    display:         flex;
    align-items:     center;
    justify-content: space-between;
    cursor:          pointer;
    padding:         2px 0;
    user-select:     none;
}

.session-card-title {
    display:        flex;
    flex-direction: column;
    gap:            3px;
}

.session-day-tag {
    font-family: var(--font-display);
    font-weight: 600;
    font-size:   1rem;
}

.session-card-date {
    font-size: 0.8rem;
    color:     var(--text-muted);
}

.session-card-meta {
    display:     flex;
    align-items: center;
    gap:         16px;
    font-size:   0.875rem;
    color:       var(--text-secondary);
}

.toggle-icon {
    font-size:   1.2rem;
    color:       var(--text-muted);
    line-height: 1;
    transition:  transform var(--transition);
    margin-left: 8px;
}

.session-card-body {
    display:    none;
    padding-top: 20px;
    border-top:  1px solid var(--border-subtle);
    margin-top:  16px;
}

.session-card.open .session-card-body { display: block; }
.session-card.open .toggle-icon { transform: rotate(45deg); }

.history-exercise { margin-bottom: 20px; }

.history-ex-name {
    font-size:     0.8rem;
    font-weight:   600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color:         var(--accent);
    margin-bottom: 8px;
}

.history-sets { display: flex; flex-direction: column; gap: 4px; }

.history-set-row {
    display:     flex;
    align-items: center;
    gap:         20px;
    font-size:   0.9rem;
}

.rpe-badge {
    font-size:     0.75rem;
    padding:       2px 8px;
    border-radius: 20px;
    background:    var(--surface-elevated);
    color:         var(--text-secondary);
    border:        1px solid var(--border);
}

.session-notes {
    margin-top:  16px;
    padding-top: 16px;
    border-top:  1px solid var(--border-subtle);
}

.notes-label {
    display:       block;
    font-size:     0.75rem;
    font-weight:   600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color:         var(--text-muted);
    margin-bottom: 6px;
}

.session-card-actions {
    margin-top:  20px;
    padding-top: 16px;
    border-top:  1px solid var(--border-subtle);
}

/* =========================================================
   LOG SESSION
   ========================================================= */
.log-meta-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 16px;
}

.exercise-card { margin-bottom: 16px; }

.exercise-card-header {
    display:         flex;
    align-items:     baseline;
    justify-content: space-between;
    margin-bottom:   16px;
    gap:             12px;
}

.exercise-name {
    font-size:   1.05rem;
    font-weight: 600;
}

.last-session-hint {
    font-size:   0.8rem;
    color:       var(--text-muted);
    font-family: var(--font-mono);
}

.set-table { margin-bottom: 12px; }

.set-table-header {
    display:               grid;
    grid-template-columns: 40px 1fr 1fr 1fr 36px;
    gap:                   8px;
    font-size:             0.75rem;
    font-weight:           600;
    text-transform:        uppercase;
    letter-spacing:        0.06em;
    color:                 var(--text-muted);
    padding:               0 4px 8px;
}

.set-rows { display: flex; flex-direction: column; gap: 6px; }

.set-row {
    display:               grid;
    grid-template-columns: 40px 1fr 1fr 1fr 36px;
    gap:                   8px;
    align-items:           center;
}

.set-num {
    font-family: var(--font-mono);
    font-size:   0.8rem;
    color:       var(--text-muted);
    text-align:  center;
    font-weight: 500;
}

.btn-remove-set {
    background:    none;
    border:        1px solid var(--border);
    color:         var(--text-muted);
    border-radius: var(--radius);
    width:         32px;
    height:        32px;
    display:       flex;
    align-items:   center;
    justify-content: center;
    cursor:        pointer;
    font-size:     0.8rem;
    transition:    color var(--transition), border-color var(--transition);
    line-height:   1;
}

.btn-remove-set:hover {
    color:        var(--error);
    border-color: var(--error);
}

/* =========================================================
   MANAGE SPLIT
   ========================================================= */
.inline-form {
    display: flex;
    gap:     10px;
}

.inline-form .form-control { flex: 1; }

.day-card { margin-bottom: 12px; }

.day-card-header {
    display:         flex;
    align-items:     center;
    justify-content: space-between;
    margin-bottom:   16px;
    flex-wrap:       wrap;
    gap:             8px;
}

.day-title-wrap {
    display:     flex;
    align-items: center;
    gap:         10px;
    flex:        1;
}

.day-order-badge {
    width:         24px;
    height:        24px;
    border-radius: 50%;
    background:    var(--accent-dim);
    border:        1px solid var(--accent);
    color:         var(--accent);
    font-size:     0.75rem;
    font-weight:   700;
    display:       flex;
    align-items:   center;
    justify-content: center;
    flex-shrink:   0;
}

.day-name-display {
    font-family: var(--font-display);
    font-size:   1rem;
    font-weight: 600;
}

.day-actions, .ex-actions {
    display:     flex;
    align-items: center;
    gap:         4px;
    flex-wrap:   wrap;
}

.exercise-list {
    border-top:     1px solid var(--border-subtle);
    padding-top:    12px;
    margin-bottom:  12px;
    display:        flex;
    flex-direction: column;
    gap:            6px;
}

.exercise-row {
    display:         flex;
    align-items:     center;
    gap:             10px;
    padding:         8px;
    border-radius:   var(--radius);
    background:      var(--surface-elevated);
}

.ex-order {
    font-family: var(--font-mono);
    font-size:   0.75rem;
    color:       var(--text-muted);
    width:       18px;
    text-align:  center;
    flex-shrink: 0;
}

.ex-name-display {
    flex:      1;
    font-size: 0.9rem;
}

.add-exercise-row {
    display: flex;
    gap:     8px;
}

.add-exercise-row .form-control { flex: 1; }

/* =========================================================
   SETTINGS
   ========================================================= */
.settings-form { max-width: 420px; }

.status-badge {
    padding:       4px 12px;
    border-radius: 20px;
    font-size:     0.8rem;
    font-weight:   600;
}

.badge-on {
    background: var(--success-dim);
    color:      var(--success);
    border:     1px solid var(--success);
}

.badge-off {
    background: var(--surface-elevated);
    color:      var(--text-muted);
    border:     1px solid var(--border);
}

.mfa-setup {
    display:        flex;
    flex-direction: column;
    gap:            16px;
    margin:         20px 0;
}

.qr-wrap {
    background:    var(--surface-elevated);
    border:        1px solid var(--border);
    border-radius: var(--radius-lg);
    padding:       16px;
    display:       inline-flex;
    width:         fit-content;
}

.qr-wrap img { display: block; }

.mfa-manual { display: flex; flex-direction: column; gap: 4px; }

.totp-secret {
    font-family:    var(--font-mono);
    font-size:      0.9rem;
    letter-spacing: 0.08em;
    user-select:    all;
    padding:        8px 12px;
    display:        inline-block;
}

/* =========================================================
   PROGRESS CHARTS
   ========================================================= */
.chart-wrap {
    position:    relative;
    height:      280px;
    margin-top:  8px;
}

.chart-note {
    font-size:  0.8rem;
    color:      var(--text-muted);
    margin-top: 10px;
}

/* =========================================================
   FORMS
   ========================================================= */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display:       block;
    font-size:     0.8rem;
    font-weight:   600;
    color:         var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-control {
    width:         100%;
    background:    var(--surface-elevated);
    border:        1px solid var(--border);
    border-radius: var(--radius);
    color:         var(--text);
    padding:       9px 12px;
    font-size:     0.9375rem;
    font-family:   var(--font-body);
    transition:    border-color var(--transition), box-shadow var(--transition);
    outline:       none;
}

.form-control:focus {
    border-color: var(--accent);
    box-shadow:   0 0 0 3px var(--accent-dim);
}

.form-control::placeholder { color: var(--text-muted); }

select.form-control { cursor: pointer; }

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

/* Monospace numeric inputs - the signature element */
.input-mono {
    font-family: var(--font-mono);
    font-size:   1rem;
    font-weight: 500;
}

.input-code {
    font-size:      1.4rem;
    letter-spacing: 0.2em;
    text-align:     center;
    max-width:      220px;
}

.field-hint {
    display:    block;
    font-size:  0.8rem;
    color:      var(--text-muted);
    margin-top: 6px;
}

.form-actions {
    display:     flex;
    align-items: center;
    gap:         10px;
    margin-top:  8px;
}

/* =========================================================
   BUTTONS
   ========================================================= */
.btn {
    display:       inline-flex;
    align-items:   center;
    justify-content: center;
    gap:           6px;
    padding:       9px 18px;
    border-radius: var(--radius);
    font-family:   var(--font-body);
    font-size:     0.875rem;
    font-weight:   600;
    cursor:        pointer;
    transition:    background var(--transition), color var(--transition),
                   border-color var(--transition), opacity var(--transition);
    border:        1px solid transparent;
    white-space:   nowrap;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color:      #0e1014;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color:      #0e1014;
}

.btn-secondary {
    background:   var(--surface-elevated);
    border-color: var(--border);
    color:        var(--text);
}

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

.btn-ghost {
    background:   transparent;
    border-color: transparent;
    color:        var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--surface-elevated);
    color:      var(--text);
}

.btn-danger-ghost {
    background:   transparent;
    border-color: var(--border);
    color:        var(--error);
}

.btn-danger-ghost:hover {
    border-color: var(--error);
    background:   var(--error-dim);
}

.btn-full   { width: 100%; }
.btn-sm     { padding: 6px 12px; font-size: 0.8rem; }
.btn-xs     { padding: 4px 8px;  font-size: 0.75rem; }
.btn-add-set { font-size: 0.85rem; margin-top: 4px; color: var(--accent); }

/* =========================================================
   ALERTS
   ========================================================= */
.alert {
    padding:       12px 16px;
    border-radius: var(--radius);
    font-size:     0.9rem;
    margin-bottom: 20px;
    border:        1px solid;
}

.alert-success {
    background:   var(--success-dim);
    border-color: var(--success);
    color:        var(--success);
}

.alert-error {
    background:   var(--error-dim);
    border-color: var(--error);
    color:        var(--error);
}

/* =========================================================
   EMPTY STATE
   ========================================================= */
.empty-state {
    display:         flex;
    flex-direction:  column;
    align-items:     center;
    gap:             12px;
    padding:         32px;
    text-align:      center;
    color:           var(--text-secondary);
}

/* =========================================================
   PAGINATION
   ========================================================= */
.pagination {
    display:         flex;
    align-items:     center;
    justify-content: center;
    gap:             12px;
    margin-top:      24px;
}

.page-info {
    font-size: 0.875rem;
    color:     var(--text-muted);
}

/* =========================================================
   UTILITY
   ========================================================= */
.mono        { font-family: var(--font-mono); }
.text-muted  { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.no-exercises-msg { font-size: 0.85rem; color: var(--text-muted); padding: 8px 0; }

/* =========================================================
   LOGIN PAGE
   ========================================================= */
body.login-body {
    display:         flex;
    align-items:     center;
    justify-content: center;
    min-height:      100vh;
}

.login-wrap {
    width:         400px;
    max-width:     calc(100vw - 32px);
    background:    var(--surface);
    border:        1px solid var(--border);
    border-radius: var(--radius-lg);
    padding:       40px;
}

.login-header {
    text-align:    center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size:   1.6rem;
    margin-top:  12px;
    margin-bottom: 6px;
}

.login-header p {
    color:     var(--text-secondary);
    font-size: 0.9rem;
}

.login-form .btn { margin-top: 8px; }

.back-link {
    display:    block;
    text-align: center;
    margin-top: 16px;
    font-size:  0.875rem;
    color:      var(--text-muted);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 768px) {
    .sidebar {
        transform:  translateX(-100%);
        transition: transform 250ms ease;
    }

    .sidebar.open { transform: translateX(0); }

    .overlay.open { display: block; }

    .menu-toggle { display: flex; }

    .main-content {
        margin-left: 0;
        padding:     24px 16px;
        padding-top: 64px;
    }

    .log-meta-row {
        grid-template-columns: 1fr;
    }

    .set-table-header,
    .set-row {
        grid-template-columns: 30px 1fr 1fr 1fr 32px;
        gap:                   6px;
    }

    .page-header {
        flex-direction: column;
        align-items:    flex-start;
    }

    .stats-row { grid-template-columns: 1fr 1fr; }

    .day-card-header { flex-direction: column; align-items: flex-start; }

    .inline-form { flex-direction: column; }
}

@media (max-width: 480px) {
    .stats-row { grid-template-columns: 1fr; }

    .session-card-meta { gap: 8px; }
}