/* ── Base ─────────────────────────────────────────── */
body {
    font-family: 'Inter', sans-serif;
    background-color: #f3f4f6;
}

input[type="text"],
input[type="number"] {
    padding: 8px 10px;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    font-size: 1rem;      /* prevents iOS auto-zoom on focus */
}

/* ── Buttons ──────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    outline: none;
    /* min touch target */
    min-height: 40px;
}
.btn:focus-visible {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}
.btn:hover:not(:disabled) {
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}
.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Colour variants */
.btn-primary   { background-color: #2563eb; color: white; }
.btn-primary:hover:not(:disabled)   { background-color: #1d4ed8; }
.btn-secondary { background-color: #059669; color: white; }
.btn-secondary:hover:not(:disabled) { background-color: #047857; }
.btn-accent    { background-color: #4b5563; color: white; }
.btn-accent:hover:not(:disabled)    { background-color: #374151; }
.btn-danger    { background-color: #dc2626; color: white; }
.btn-danger:hover:not(:disabled)    { background-color: #b91c1c; }
.btn-info      { background-color: #0ea5e9; color: white; }
.btn-info:hover:not(:disabled)      { background-color: #0284c7; }
.btn-warning   { background-color: #f59e0b; color: white; }
.btn-warning:hover:not(:disabled)   { background-color: #d97706; }

/* Size variants */
.btn-sm   { padding: 7px 14px; font-size: 0.875rem; min-height: 36px; }
.btn-xs   { padding: 6px 12px; font-size: 0.75rem;  min-height: 32px; }
.btn-icon { padding: 8px;      font-size: 0.875rem; min-height: 36px; min-width: 36px; }

/* ── Cards ────────────────────────────────────────── */
.workout-card {
    background-color: white;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.06);
    padding: 16px;
    overflow: hidden;
}

.card-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid #e5e7eb;
}

/* ── Exercise items ───────────────────────────────── */
.exercise-item {
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    background-color: #ffffff;
}

.exercise-item .update-form {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.exercise-item .update-form input {
    width: 76px;
    flex-shrink: 0;
    flex-grow: 0;
}

.exercise-item .name-edit-input {
    width: 100%;
}

/* ── Add-exercise form ────────────────────────────── */
.add-exercise-form {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid #e5e7eb;
}
.add-exercise-form input {
    flex-grow: 1;
    min-width: 140px;
}

/* ── History ──────────────────────────────────────── */
.history-content { background-color: #f9fafb; }
.history-table   { width: 100%; font-size: 0.8125rem; }
.history-table th,
.history-table td { padding: 6px 10px; border-bottom: 1px solid #e5e7eb; }
.history-table th { background-color: #f3f4f6; font-weight: 600; text-align: left; }
.history-table tr:last-child td { border-bottom: none; }

/* ── PR badge ─────────────────────────────────────── */
.pr-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
    white-space: nowrap;
}

/* ── Toast ────────────────────────────────────────── */
#toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: white;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    white-space: nowrap;
}
#toast.show    { opacity: 1; }
#toast.success { background-color: #059669; }
#toast.error   { background-color: #dc2626; }

/* ── Mobile tab navigation ────────────────────────── */
.tab-bar {
    display: flex;
    border-bottom: 1px solid #e5e7eb;
    background: white;
}

.tab-btn {
    flex: 1;
    padding: 12px 8px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: #6b7280;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
    /* touch target */
    min-height: 48px;
}
.tab-btn.active {
    color: #2563eb;
    border-bottom-color: #2563eb;
    font-weight: 600;
}

/* Hide inactive tabs on mobile, show all on desktop */
.tab-hidden { display: none; }

@media (min-width: 1024px) {
    .tab-hidden { display: block; }
    .tab-bar    { display: none; }
    .workout-card { padding: 20px; }
}