/* ─── Design tokens ─────────────────────────────────────────────── */
:root {
    --bg:        #E4E0D8;
    --card:      #FAFAF8;
    --ink:       #0F0F0F;
    --red:       #C41E1E;
    --red-dark:  #A01818;
    --muted:     #777;
    --border:    #0F0F0F;
    --rule:      #CACAC2;

    --font-display: 'Bebas Neue', sans-serif;
    --font-cond:    'Barlow Condensed', sans-serif;
    --font-body:    'Barlow', sans-serif;
}

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

/* ─── Body / background ─────────────────────────────────────────── */
body {
    font-family: var(--font-body);
    background-color: var(--bg);
    /* Subtle crosshatch texture — no gradients */
    background-image:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 23px,
            rgba(0,0,0,0.035) 23px,
            rgba(0,0,0,0.035) 24px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 23px,
            rgba(0,0,0,0.025) 23px,
            rgba(0,0,0,0.025) 24px
        );
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2.5rem 1rem;
}

/* ─── Card ───────────────────────────────────────────────────────── */
.container {
    background: var(--card);
    border: 3px solid var(--ink);
    max-width: 460px;
    width: 100%;
    padding: 0;
    box-shadow: 6px 6px 0 var(--ink);
}

/* ─── Header ─────────────────────────────────────────────────────── */
header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 1.5rem 1.75rem 1.25rem;
    border-bottom: 3px solid var(--ink);
    background: var(--ink);
}

.h1-btn {
    font-family: var(--font-display);
    font-size: 3.5rem;
    line-height: 1;
    color: #fff;
    letter-spacing: 0.02em;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-color: rgba(255,255,255,0.2);
    transition: text-decoration-color 0.15s;
    flex: none;
}

.h1-btn:hover {
    text-decoration-color: rgba(255,255,255,0.6);
}

.header-meta {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.subtitle {
    font-family: var(--font-cond);
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    line-height: 1;
}

.formula-tag {
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 500;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-color: rgba(255,255,255,0.25);
    transition: color 0.15s, text-decoration-color 0.15s;
}

.formula-tag:hover {
    color: rgba(255,255,255,0.85);
    text-decoration-color: rgba(255,255,255,0.6);
}

/* ─── Controls ───────────────────────────────────────────────────── */
.controls {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--rule);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem 1.75rem;
    flex: 1;
}

.control-group + .control-group {
    border-left: 2px solid var(--rule);
}

.control-label {
    font-family: var(--font-cond);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
}

/* ─── Segmented button toggle ────────────────────────────────────── */
.btn-toggle {
    display: flex;
    border: 2px solid var(--ink);
}

.toggle-btn {
    font-family: var(--font-cond);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 0.65rem;
    border: none;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
    line-height: 1;
}

.toggle-btn + .toggle-btn {
    border-left: 2px solid var(--ink);
}

.toggle-btn.active {
    background: var(--ink);
    color: #fff;
}

.toggle-btn:not(.active):hover {
    background: rgba(0,0,0,0.06);
}

/* ─── Form body ──────────────────────────────────────────────────── */
.form-group {
    padding: 0 1.75rem;
}

.form-group:first-child {
    padding-top: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1.25rem;
    padding: 0 1.75rem;
}

.form-row .form-group,
.form-row .form-group + .form-group {
    padding: 0;
    margin-top: 0;
}

.form-group + .form-group,
.form-group + .form-row,
.form-row + .form-group,
.form-row + .form-row {
    margin-top: 1.25rem;
}

label {
    display: block;
    margin-bottom: 0.4rem;
    font-family: var(--font-cond);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

label span {
    color: var(--red);
}

.input-wrapper {
    position: relative;
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 2px solid var(--ink);
    background: #fff;
    border-radius: 0;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    color: var(--ink);
    transition: border-color 0.15s, box-shadow 0.15s;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--red);
    box-shadow: 3px 3px 0 rgba(196, 30, 30, 0.2);
}

input::placeholder {
    color: #bbb;
    font-weight: 400;
}

/* ─── Autocomplete ───────────────────────────────────────────────── */
.autocomplete-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border: 2px solid var(--ink);
    border-top: none;
    max-height: 200px;
    overflow-y: auto;
    display: none;
    z-index: 1000;
    box-shadow: 4px 4px 0 var(--ink);
}

.autocomplete-list.active {
    display: block;
}

.autocomplete-item {
    padding: 0.55rem 0.75rem;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--ink);
    border-bottom: 1px solid var(--rule);
    transition: background 0.1s;
}

.autocomplete-item:last-child {
    border-bottom: none;
}

.autocomplete-item:hover,
.autocomplete-item.selected {
    background: #F5F3EF;
}

/* ─── Result box ─────────────────────────────────────────────────── */
.result-box {
    background: var(--red);
    color: #fff;
    margin: 1.5rem 1.75rem;
    padding: 1.25rem 1.5rem;
    border: 3px solid var(--ink);
    box-shadow: 4px 4px 0 var(--ink);
}

.result-label {
    font-family: var(--font-cond);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    opacity: 0.75;
    margin-bottom: 0.25rem;
}

.result-number {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
}

.result-value {
    font-family: var(--font-display);
    font-size: 4.5rem;
    line-height: 1;
    letter-spacing: 0.02em;
}

.result-unit {
    font-family: var(--font-cond);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.8;
    padding-bottom: 0.4rem;
}

/* ─── Result action buttons (Log / Share) ────────────────────────── */
.result-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.85rem;
}

.result-action-btn {
    padding: 0.35rem 0.9rem;
    background: rgba(255,255,255,0.15);
    border: 2px solid rgba(255,255,255,0.5);
    color: #fff;
    font-family: var(--font-cond);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.12s, border-color 0.12s;
}

.result-action-btn:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,255,255,0.8);
}

/* ─── Bodyweight classification (inside result box) ──────────────── */
.bw-classification {
    display: block;
    margin-top: 0.6rem;
    background: none;
    border: none;
    padding: 0;
    font-family: var(--font-cond);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.65);
    cursor: pointer;
    text-align: left;
    transition: color 0.12s;
}

.bw-classification:hover {
    color: rgba(255,255,255,0.95);
}

.bw-level {
    color: #fff;
    font-weight: 700;
}

/* ─── Bodyweight modal input ─────────────────────────────────────── */
.bw-modal-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.bw-modal-row input[type="number"] {
    width: 7rem;
}

.bw-modal-row span {
    font-family: var(--font-cond);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

/* ─── Tab bar ────────────────────────────────────────────────────── */
.tab-bar {
    display: flex;
    border-top: 3px solid var(--ink);
}

.tab-btn {
    flex: 1;
    padding: 0.85rem 0.5rem;
    border: none;
    background: var(--card);
    color: var(--muted);
    font-family: var(--font-cond);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
    border-right: 2px solid var(--rule);
}

.tab-btn:last-child {
    border-right: none;
}

.tab-btn:hover:not(.active) {
    background: #EEECEA;
    color: var(--ink);
}

.tab-btn.active {
    background: var(--ink);
    color: #fff;
}

/* ─── Percentage view ────────────────────────────────────────────── */
#percentageView {
    overflow-y: auto;
    border-top: 2px solid var(--rule);
    border-bottom: 2px solid var(--rule);
}

.percentage-view-empty {
    padding: 2.5rem 1.75rem;
    font-family: var(--font-cond);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    text-align: center;
}

.percentage-view-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 1.25rem 0.6rem 1.5rem;
    border-bottom: 1px solid var(--rule);
    gap: 0.75rem;
}

.pct-header-main {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.pct-lift-name {
    font-family: var(--font-cond);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

.pct-1rm {
    font-family: var(--font-display);
    font-size: 1.6rem;
    line-height: 1;
    letter-spacing: 0.02em;
    color: var(--red);
}

.print-btn {
    flex-shrink: 0;
    padding: 0.35rem 0.75rem;
    background: none;
    border: 2px solid var(--rule);
    color: var(--muted);
    font-family: var(--font-cond);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: border-color 0.12s, color 0.12s;
}

.print-btn:hover {
    border-color: var(--ink);
    color: var(--ink);
}

/* ─── Modal ──────────────────────────────────────────────────────── */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    inset: 0;
    background: rgba(0,0,0,0.55);
    overflow-y: auto;
    padding: 2rem 1rem;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.modal-content {
    background: var(--card);
    border: 3px solid var(--ink);
    box-shadow: 8px 8px 0 var(--ink);
    max-width: 440px;
    width: 100%;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--ink);
    color: #fff;
}

.modal-header h2 {
    font-family: var(--font-cond);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    color: rgba(255,255,255,0.7);
    padding: 0;
    width: auto;
    flex: 0;
    font-family: var(--font-body);
    transition: color 0.12s;
}

.close-btn:hover {
    color: #fff;
}

/* ─── Percentage table ───────────────────────────────────────────── */
.percentage-table {
    width: 100%;
    border-collapse: collapse;
}

.percentage-table th,
.percentage-table td {
    padding: 0.5rem 1.25rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    text-align: right;
    border-bottom: 1px solid var(--rule);
}

.percentage-table th:first-child,
.percentage-table td:first-child {
    text-align: left;
}

.percentage-table th {
    font-family: var(--font-cond);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    background: #F0EDE8;
}

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

.percentage-table tbody tr:not(.zone-group):hover {
    background: #F7F5F1;
}

.percentage-table tbody tr:last-child {
    font-weight: 600;
    background: #FFF5F5;
}

.percentage-table tbody tr:last-child td {
    color: var(--red);
}

.percentage-table .zone-group td {
    background: #EDEAE5;
    font-family: var(--font-cond);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    padding: 0.25rem 1.25rem;
    border-bottom: none;
    text-align: left;
}

/* ─── History view ───────────────────────────────────────────────── */
#historyView {
    overflow-y: auto;
    border-top: 2px solid var(--rule);
    border-bottom: 2px solid var(--rule);
    margin-bottom: 0;
}

.history-empty {
    padding: 2.5rem 1.75rem;
    font-family: var(--font-cond);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    text-align: center;
}

.history-lift-card {
    border-bottom: 1px solid var(--rule);
}

.history-lift-card:last-child {
    border-bottom: none;
}

.history-row {
    display: flex;
    align-items: center;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex: 1;
    min-width: 0;
    padding: 0.7rem 1rem 0.7rem 1.75rem;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background 0.1s;
    gap: 0.75rem;
}

.history-item:hover {
    background: #F5F3EF;
}

.history-lift {
    font-family: var(--font-cond);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--ink);
    flex: 1;
    min-width: 0;
    text-align: left;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.1rem;
    flex-shrink: 0;
}

.history-1rm {
    font-family: var(--font-display);
    font-size: 1.4rem;
    line-height: 1;
    color: var(--red);
    letter-spacing: 0.02em;
}

.history-date {
    font-family: var(--font-body);
    font-size: 0.7rem;
    color: var(--muted);
}

.history-sparkline-area {
    display: flex;
    align-items: center;
    padding: 0 0.25rem;
    flex-shrink: 0;
}

.sparkline {
    display: block;
    color: var(--red);
    opacity: 0.7;
}

.history-expand-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 100%;
    min-height: 2.6rem;
    padding: 0 0.25rem;
    margin-right: 0.5rem;
    background: none;
    border: none;
    border-left: 1px solid var(--rule);
    font-family: var(--font-cond);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--muted);
    cursor: pointer;
    transition: color 0.1s, background 0.1s;
    flex-shrink: 0;
    position: relative;
}

.history-expand-btn::after {
    content: '▾';
    display: block;
    font-size: 0.6rem;
    line-height: 1;
    margin-top: 1px;
}

.history-expand-btn.expanded::after {
    content: '▴';
}

.history-expand-btn:hover {
    color: var(--ink);
    background: #F5F3EF;
}

/* ─── Expanded entry list ────────────────────────────────────────── */
.history-entries {
    background: #F7F5F1;
    border-top: 1px solid var(--rule);
}

.history-entry {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1rem 0.45rem 2.5rem;
    border-bottom: 1px solid var(--rule);
    font-family: var(--font-body);
    font-size: 0.82rem;
}

.history-entry:last-child {
    border-bottom: none;
}

.entry-set {
    color: var(--muted);
    flex-shrink: 0;
}

.entry-rm {
    color: var(--ink);
    font-weight: 500;
    flex: 1;
}

.entry-date {
    color: var(--muted);
    font-size: 0.74rem;
    flex-shrink: 0;
}

.delete-entry-btn {
    background: none;
    border: none;
    color: #bbb;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 0.25rem;
    flex-shrink: 0;
    transition: color 0.12s;
}

.delete-entry-btn:hover {
    color: var(--red);
}

/* ─── Formula modal body ─────────────────────────────────────────── */
.formula-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.formula-body p {
    font-family: var(--font-body);
    font-size: 0.9rem;
    line-height: 1.6;
    color: #333;
}

.formula-body strong {
    color: var(--ink);
}

.formula-display {
    background: #F0EDE8;
    border: 2px solid var(--ink);
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.formula-line {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-cond);
    font-size: 1rem;
}

.formula-var {
    font-weight: 700;
    letter-spacing: 0.05em;
}

.formula-eq {
    color: var(--muted);
    margin: 0 0.15rem;
}

.formula-expr {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.formula-paren {
    font-size: 1.6rem;
    line-height: 1;
    color: var(--muted);
    font-weight: 300;
}

.formula-frac {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    margin: 0 0.1rem;
}

.formula-num {
    border-bottom: 2px solid var(--ink);
    padding: 0 0.3rem 0.15rem;
    font-size: 0.85rem;
    white-space: nowrap;
}

.formula-den {
    padding: 0.15rem 0.3rem 0;
    font-size: 0.85rem;
    white-space: nowrap;
}

.formula-key {
    font-family: var(--font-body);
    font-size: 0.78rem;
    color: var(--muted);
    font-style: italic;
}

.formula-link {
    display: inline-block;
    font-family: var(--font-cond);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--red);
    text-decoration: none;
    border-bottom: 2px solid var(--red);
    padding-bottom: 0.1rem;
    transition: color 0.15s, border-color 0.15s;
}

.formula-link:hover {
    color: var(--red-dark);
    border-color: var(--red-dark);
}

.info-steps {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.info-step {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    line-height: 1.5;
    color: #333;
}

.step-num {
    font-family: var(--font-display);
    font-size: 1.6rem;
    line-height: 1;
    color: var(--red);
    flex-shrink: 0;
    width: 1.2rem;
    text-align: center;
}

/* ─── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 520px) {
    body {
        padding: 1rem 0.75rem;
    }

    .container {
        box-shadow: 4px 4px 0 var(--ink);
    }

    h1 { font-size: 2.75rem; }

    .result-value { font-size: 3.5rem; }

    .form-group,
    .form-row {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
    }

    .result-box {
        margin-left: 1.25rem;
        margin-right: 1.25rem;
    }

    .control-group {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.35rem;
    }

    .percentage-table th,
    .percentage-table td {
        padding: 0.45rem 0.75rem;
        font-size: 0.85rem;
    }

    .percentage-table .zone-group td {
        padding: 0.2rem 0.75rem;
    }
}

@media (max-width: 360px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ─── Print ──────────────────────────────────────────────────────── */
@media print {
    @page { margin: 1.5cm; }

    body {
        background: white !important;
        padding: 0 !important;
        min-height: unset;
        display: block;
    }

    .container {
        border: none !important;
        box-shadow: none !important;
        max-width: 100% !important;
    }

    header,
    .controls,
    #calculatorView,
    #historyView,
    .tab-bar,
    .modal,
    .print-btn {
        display: none !important;
    }

    #percentageView {
        height: auto !important;
        overflow: visible !important;
        border: none !important;
    }

    .percentage-view-header {
        border-bottom: 2px solid #000 !important;
        padding: 0 0 0.5rem !important;
        margin-bottom: 0.25rem;
    }

    .pct-lift-name {
        font-size: 0.8rem !important;
        color: #555 !important;
    }

    .pct-1rm {
        font-size: 2rem !important;
        color: #000 !important;
    }

    .percentage-table th,
    .percentage-table td {
        padding: 0.35rem 0.6rem !important;
    }

    .percentage-table th {
        background: #eee !important;
        color: #000 !important;
    }

    .percentage-table .zone-group td {
        background: #f5f5f5 !important;
        color: #555 !important;
        padding: 0.2rem 0.6rem !important;
    }

    .percentage-table tbody tr:last-child {
        background: none !important;
    }

    .percentage-table tbody tr:last-child td {
        color: #000 !important;
        font-weight: 700 !important;
    }

    .percentage-table tr:last-child td {
        border-bottom: 1px solid #ccc !important;
    }
}