:root {
    --bg: #ffffff;
    --text: #111111;
    --muted: #666666;
    --border: #d8d8d8;
    --rule: #efefef;
    --code-bg: #f8f8f8;

    /* Highlight Colors */
    --hl-primary: rgba(59, 130, 246, 0.13);
    --hl-warning: rgba(245, 158, 11, 0.16);
    --hl-error: rgba(220, 38, 38, 0.13);
    --hl-success: rgba(16, 185, 129, 0.13);
    --success-color: #10b981;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.5;
    font-size: 14px;
    padding: 2rem;
}

.container {
    max-width: 520px;
    margin: 0 auto;
}

.session-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.field-row-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

@media (max-width: 480px) {
    .field-row-3 {
        gap: 0.35rem;
    }
    .field-row-3 .confirm-btn {
        padding: 0.6rem 0.4rem;
    }
    .field-row-3 input[type="number"] {
        padding: 0.6rem 0.4rem;
        font-size: 13px;
    }
    .field-row-3 label {
        font-size: 10px;
        letter-spacing: 0.02em;
    }
}

label, .display-label, .section-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text);
}

select, input[type="number"], input[type="text"] {
    width: 100%;
    padding: 0.6rem 0.8rem;
    background: #ffffff;
    border: 1px solid var(--border);
    color: var(--text);
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 14px;
    outline: none;
    border-radius: 0;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23111111%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 0.8rem top 50%;
    background-size: 0.65rem auto;
    padding-right: 2rem;
}

select:focus, input[type="number"]:focus, input[type="text"]:focus {
    border-color: var(--text);
}

.input-with-action {
    display: flex;
    gap: 0.5rem;
}

.confirm-btn {
    padding: 0.6rem 1rem;
    background: #f4f4f5;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

.confirm-btn:hover {
    background: #e4e4e7;
    color: var(--text);
}

.confirm-btn.flash-success {
    background: rgba(16, 185, 129, 0.18) !important;
    border-color: var(--success-color) !important;
    color: var(--success-color) !important;
    transition: none !important;
}

/* Inline Header Small Input & Checkmark */
.small-inline-input {
    width: 125px;
    padding: 0.25rem 0.5rem;
    font-size: 12px;
    height: 26px;
    border: 1px solid var(--border);
    background: #ffffff;
    color: var(--text);
    outline: none;
    border-radius: 0;
}

.small-inline-input:focus {
    border-color: var(--text);
}

.small-confirm-btn {
    height: 26px;
    padding: 0 0.5rem;
    background: #f4f4f5;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

.small-confirm-btn:hover {
    background: #e4e4e7;
    color: var(--text);
}

.small-confirm-btn.flash-success {
    background: rgba(16, 185, 129, 0.18) !important;
    border-color: var(--success-color) !important;
    color: var(--success-color) !important;
    transition: none !important;
}

.display-box {
    margin-top: 0.25rem;
    display: none;
}

.btn-primary {
    width: 100%;
    padding: 0.8rem 1rem;
    background: #111111;
    color: #ffffff;
    border: 1px solid #111111;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    cursor: pointer;
    border-radius: 0;
    transition: background 0.15s ease;
    margin-top: 0.5rem;
}

.btn-primary:hover {
    background: #333333;
    border-color: #333333;
}

.btn-primary:active {
    background: #000000;
}

.btn-secondary {
    width: 100%;
    padding: 0.8rem 1rem;
    background: #ffffff;
    color: var(--text);
    border: 1px solid var(--border);
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    cursor: pointer;
    border-radius: 0;
    transition: background 0.15s ease, border-color 0.15s ease;
    margin-top: 1.5rem;
    display: none;
}

.btn-secondary:hover {
    background: var(--hl-warning);
    border-color: #f59e0b;
}

.btn-secondary:active {
    background: rgba(245, 158, 11, 0.3);
}

/* Logged Sets Section */
.logged-section {
    display: none;
    margin-top: 1rem;
    border-top: 1px solid var(--rule);
    padding-top: 1.5rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.75rem;
}

thead th {
    text-align: left;
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    padding: 0.5rem 0.7rem;
    border-bottom: 1px solid var(--border);
    background: #fafafa;
}

tbody td {
    padding: 0.55rem 0.7rem;
    border-bottom: 1px solid var(--rule);
    font-family: SF Mono, Fira Code, Consolas, monospace;
    font-size: 13px;
}

.delete-set-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--muted);
    font-size: 13px;
    line-height: 1;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 2px;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0.4;
}

.delete-set-btn:hover {
    opacity: 1;
    color: var(--text);
    background: #f4f4f5;
}

.delete-set-btn.confirm-delete {
    opacity: 1;
    background: #dc2626 !important;
    color: #ffffff !important;
    border-color: #dc2626 !important;
    font-weight: 700;
}

.history-card {
    cursor: pointer;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.history-card.selected {
    border-color: #2563eb !important;
    background-color: #eff6ff !important;
    box-shadow: 0 0 0 1px #2563eb;
}

.clickable-lift {
    cursor: pointer;
    color: var(--text);
    font-weight: 700;
    text-decoration: none;
    padding: 2px 5px;
    margin: 0 -2px;
    border-radius: 3px;
    transition: background-color 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease, color 0.15s ease;
}

.clickable-lift:hover {
    color: #000000;
    background-color: #e4e4e7;
    box-shadow: 0 0 0 1px #d4d4d8;
}

.clickable-lift.active-filter-lift {
    color: #000000;
    background-color: #d4d4d8;
    box-shadow: 0 0 0 1px #a1a1aa;
}

.clickable-lift.deactivated-lift {
    color: var(--muted);
    background-color: transparent;
    box-shadow: none;
}

.clickable-lift.deactivated-lift:hover {
    color: var(--text);
    background-color: #f4f4f5;
    box-shadow: 0 0 0 1px var(--border);
}

.btn-unfurl {
    width: 100%;
    padding: 0.4rem 1rem;
    background: #e4e4e7;
    color: #52525b;
    border: 1px solid #d4d4d8;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    cursor: pointer;
    border-radius: 0;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
    margin-top: 0.25rem;
    margin-bottom: 0.35rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
}

.btn-unfurl:hover {
    background: #d4d4d8;
    border-color: #a1a1aa;
    color: #18181b;
}

/* Tabs Styling */
.tabs-nav {
    display: flex;
    border-bottom: 1px solid var(--border);
    width: 100%;
}

.tab-btn {
    flex: 1;
    background: #f7f7f7;
    border: 1px solid var(--border);
    border-bottom: none;
    margin-right: -1px;
    margin-bottom: -1px;
    position: relative;
    z-index: 1;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    text-align: center;
}

.tab-btn.active {
    background: #ffffff;
    border-bottom: 1px solid #ffffff;
    z-index: 2;
    color: var(--text);
}

.tab-panel {
    display: none;
    padding-top: 0.75rem;
}

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

/* Session Summary Metadata Grid */
.summary-section {
    display: none;
    margin-top: 1.5rem;
    border-top: 1px solid var(--rule);
    padding-top: 1.5rem;
}

.metadata-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--border);
    background: #fafafa;
    margin-top: 0.75rem;
}

.metadata-cell {
    padding: 0.75rem 1rem;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.metadata-cell:nth-child(2n) {
    border-right: none;
}

.metadata-cell:nth-last-child(-n+2) {
    border-bottom: none;
}

.metadata-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    margin-bottom: 0.2rem;
}

.metadata-value {
    font-family: SF Mono, Fira Code, Consolas, monospace;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
}

.calc-btn {
    cursor: pointer;
    user-select: none;
    transition: color 0.1s ease;
}
.calc-btn:hover {
    color: #2563eb;
}
.calc-btn:active {
    color: #1d4ed8;
}

pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border);
    padding: 1rem;
    overflow-x: auto;
    font-family: SF Mono, Fira Code, Consolas, monospace;
    font-size: 12px;
    margin-top: 0.75rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.locked-field {
    background-color: #f8f8f8 !important;
    color: var(--muted) !important;
    cursor: not-allowed !important;
}

.locked-btn {
    opacity: 0.5 !important;
    cursor: not-allowed !important;
    background-color: #f4f4f5 !important;
}

/* Heatmap Toggle Button in Lifts Tab */
.heatmap-toggle-btn {
    background: #ffffff;
    border: 1px solid var(--border);
    color: var(--muted);
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 7px;
    cursor: pointer;
    border-radius: 2px;
    display: inline-flex;
    align-items: center;
    gap: 3px;
    transition: all 0.15s ease;
    user-select: none;
    line-height: 1.4;
}

.heatmap-toggle-btn:hover {
    background: #f4f4f5;
    border-color: #a1a1aa;
    color: var(--text);
}

.heatmap-toggle-btn .heatmap-flame {
    font-size: 11px;
    opacity: 0.55;
    filter: grayscale(0.8);
    transition: opacity 0.15s ease, filter 0.15s ease;
}

.heatmap-toggle-btn:hover .heatmap-flame {
    opacity: 0.85;
    filter: grayscale(0.2);
}

.heatmap-toggle-btn.active {
    background: #fff8e1;
    border-color: #d97706;
    color: #92400e;
    box-shadow: 0 1px 3px rgba(218, 165, 32, 0.2);
}

.heatmap-toggle-btn.active .heatmap-flame {
    opacity: 1;
    filter: none;
}

.heatmap-toggle-btn.active:hover {
    background: #fef3c7;
    border-color: #b45309;
}

/* Heatmap Weight Range Sliders */
.heatmap-weight-slider {
    accent-color: #000000;
}

/* Group Header Buttons (Accordion headers for Month, Lift, Heatmap Settings) */
.group-header-btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.65rem 0.85rem;
    background: #fafafa;
    border: 1px solid var(--border);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s ease;
}

.group-header-btn:hover {
    background: #f4f4f5;
}

.group-header-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.group-header-meta {
    font-size: 11px;
    font-weight: 600;
    color: var(--muted);
    font-family: monospace;
}

.group-header-arrow {
    font-size: 10px;
    margin-left: 0.35rem;
}

/* Download History Button Hover */
#download-history-btn {
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    color: var(--muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 12px;
    width: 12px;
    transition: color 0.15s ease;
}

#download-history-btn:hover {
    color: var(--text);
}

/* Active Filter Bar */
.filter-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #f4f4f5;
    border: 1px solid var(--border);
    padding: 0.5rem 0.8rem;
    margin-bottom: 0.75rem;
}

.month-filter-banner {
    padding: 0.4rem 0.75rem;
    margin-bottom: 0.65rem;
}

.filter-banner-text {
    font-size: 12px;
    color: var(--text);
    font-weight: 600;
}

.month-filter-banner-text {
    font-size: 11.5px;
}

.filter-clear-btn {
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

/* History Card Content Components */
.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 0.4rem;
    margin-bottom: 0.5rem;
}

.card-date-label {
    font-family: SF Mono, Fira Code, Consolas, monospace;
    font-size: 12px;
    font-weight: 700;
    color: var(--text);
}

.card-score-badge {
    font-family: SF Mono, Fira Code, Consolas, monospace;
    font-size: 10px;
    font-weight: 700;
    color: #92400e;
    background: rgba(251, 191, 36, 0.22);
    padding: 1px 5px;
    border-radius: 2px;
    border: 1px solid rgba(217, 119, 6, 0.35);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.card-id-label {
    font-size: 10px;
    color: var(--muted);
    text-transform: uppercase;
    font-weight: 600;
    font-family: monospace;
}

.card-metrics-row {
    display: flex;
    gap: 0.75rem;
    font-family: SF Mono, Fira Code, Consolas, monospace;
    font-size: 12px;
    margin-bottom: 0.5rem;
    color: var(--muted);
}

.card-metrics-row strong {
    color: var(--text);
}

.card-lifts-container {
    font-size: 12px;
    color: var(--text);
    margin-top: 0.4rem;
    border-top: 1px dashed var(--rule);
    padding-top: 0.4rem;
}

.card-lift-row {
    margin-bottom: 0.25rem;
}

.card-lift-sets-text {
    font-family: SF Mono, Fira Code, Consolas, monospace;
    color: var(--muted);
    font-size: 11px;
}

/* Empty State Message */
.empty-state-msg {
    color: var(--muted);
    font-size: 13px;
    padding: 0.75rem 0;
    font-family: monospace;
}

/* Set Notes Cell in Workout Logged Sets Table */
.notes-row-cell {
    padding-left: 1.5rem;
    font-size: 11.5px;
    color: var(--muted);
    background: #fafafa;
    border-bottom: 1px solid var(--border);
}