/* ==========================================================================
   Калькулятор норм расхода ГСМ — АМ-23-р
   ========================================================================== */

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

:root {
    --primary:    #1a56db;
    --primary-dk: #1140a3;
    --accent:     #0ea5e9;
    --success:    #16a34a;
    --warning:    #d97706;
    --danger:     #dc2626;
    --text:       #1e293b;
    --text-muted: #64748b;
    --border:     #cbd5e1;
    --bg:         #f8fafc;
    --bg-card:    #ffffff;
    --radius:     10px;
    --shadow:     0 2px 12px rgba(0,0,0,.08);
}

body {
    margin: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 15px;
    color: var(--text);
    background: var(--bg);
    line-height: 1.55;
}

/* ── Layout ── */
.page-header {
    background: linear-gradient(135deg, #1a3a6e 0%, #1a56db 100%);
    color: #fff;
    padding: 28px 24px 22px;
    text-align: center;
}
.page-header h1 {
    margin: 0 0 6px;
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -.3px;
}
.page-header p {
    margin: 0;
    font-size: .9rem;
    opacity: .82;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 16px 60px;
}

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 20px;
    overflow: hidden;
}
.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    background: #f1f5f9;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 1rem;
    color: #1e40af;
}
.card-header .step-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: .78rem;
    font-weight: 700;
    flex-shrink: 0;
}
.card-body {
    padding: 20px;
}

/* ── Form controls ── */
label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: .4px;
}
input[type=text],
input[type=number],
select,
textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1.5px solid var(--border);
    border-radius: 7px;
    font-size: .95rem;
    color: var(--text);
    background: #fff;
    transition: border-color .18s, box-shadow .18s;
    outline: none;
    appearance: none;
}
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.8' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 34px;
}
input:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,.12);
}
input[readonly] {
    background: #f1f5f9;
    color: var(--text-muted);
    cursor: default;
}
.form-group {
    margin-bottom: 16px;
}
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}
.hint {
    font-size: .8rem;
    color: var(--text-muted);
    margin-top: 4px;
}
#hs-hint {
    font-size: .8rem;
    color: #1e40af;
    background: #eff6ff;
    border-left: 3px solid var(--primary);
    border-radius: 0 6px 6px 0;
    padding: 7px 10px;
    margin-top: 6px;
    line-height: 1.5;
}

/* ── Vehicle type tabs ── */
.type-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 4px;
}
.type-tab {
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 7px;
    border: 2px solid var(--border);
    font-size: .88rem;
    font-weight: 600;
    color: var(--text-muted);
    background: #fff;
    transition: all .17s;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 6px;
}
.type-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: #eff6ff;
}
.type-tab.active {
    border-color: var(--primary);
    color: #fff;
    background: var(--primary);
}
.type-tab input[type=radio] { display: none; }

/* ── Autocomplete ── */
.autocomplete-wrap {
    position: relative;
}
.autocomplete-list {
    position: absolute;
    z-index: 100;
    width: 100%;
    background: #fff;
    border: 1.5px solid var(--primary);
    border-radius: 0 0 8px 8px;
    max-height: 220px;
    overflow-y: auto;
    box-shadow: 0 6px 18px rgba(0,0,0,.12);
    display: none;
}
.autocomplete-list li {
    padding: 9px 14px;
    cursor: pointer;
    font-size: .92rem;
    list-style: none;
    border-bottom: 1px solid #f1f5f9;
}
.autocomplete-list li:last-child { border-bottom: none; }
.autocomplete-list li:hover, .autocomplete-list li.active {
    background: #eff6ff;
    color: var(--primary);
}
.autocomplete-list li mark {
    background: #bfdbfe;
    color: inherit;
    border-radius: 2px;
    padding: 0 1px;
}
.fuel-badge {
    display: inline-block;
    padding: 2px 7px;
    border-radius: 4px;
    font-size: .73rem;
    font-weight: 700;
    letter-spacing: .5px;
    margin-left: 6px;
    vertical-align: middle;
}
.fuel-b  { background: #fef9c3; color: #854d0e; }
.fuel-d  { background: #dbeafe; color: #1e40af; }
.fuel-sug { background: #dcfce7; color: #166534; }
.fuel-kpg { background: #f0fdf4; color: #14532d; }
.fuel-e  { background: #fae8ff; color: #701a75; }

/* ── Correction factor checkboxes ── */
.corrections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 10px;
}
.correction-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: #f8fafc;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    transition: border-color .16s, background .16s;
}
.correction-item:has(input:checked),
.correction-item.active {
    border-color: var(--primary);
    background: #eff6ff;
}
.correction-item input[type=checkbox],
.correction-item input[type=radio] {
    width: 17px;
    height: 17px;
    flex-shrink: 0;
    margin-top: 2px;
    accent-color: var(--primary);
    cursor: pointer;
}
.correction-item label {
    font-size: .88rem;
    font-weight: 500;
    color: var(--text);
    text-transform: none;
    letter-spacing: 0;
    margin: 0;
    cursor: pointer;
}
.correction-item .pct {
    font-weight: 700;
    color: var(--warning);
    white-space: nowrap;
}
.correction-item .pct.negative { color: var(--success); }

.correction-select-wrap {
    margin-top: 6px;
}
.correction-select-wrap select {
    padding: 6px 30px 6px 10px;
    font-size: .88rem;
}
.corrections-section-title {
    font-size: .78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .8px;
    color: var(--text-muted);
    margin: 18px 0 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border);
}

/* ── Result ── */
#result-card {
    display: none;
    border: 2px solid var(--success);
}
#result-card .card-header {
    background: #f0fdf4;
    color: var(--success);
    border-bottom-color: #bbf7d0;
}
.result-main {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.result-value {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}
.result-unit {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 600;
}
.result-breakdown {
    border-collapse: collapse;
    width: 100%;
    font-size: .9rem;
}
.result-breakdown th, .result-breakdown td {
    padding: 7px 10px;
    text-align: left;
    border-bottom: 1px solid #f1f5f9;
}
.result-breakdown th {
    font-size: .78rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--text-muted);
    background: #f8fafc;
}
.result-breakdown tr:last-child td { border-bottom: none; }
.result-formula {
    background: #f1f5f9;
    border-radius: 8px;
    padding: 12px 16px;
    font-family: 'Courier New', Courier, monospace;
    font-size: .88rem;
    color: #1e293b;
    margin-bottom: 18px;
    white-space: pre-wrap;
    word-break: break-word;
}
.result-sub {
    font-size: .82rem;
    color: var(--text-muted);
    margin-top: 10px;
}
.total-row td { font-weight: 700; color: var(--primary); font-size: 1rem; }

/* ── Button ── */
.btn-calc {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background .17s, transform .1s;
    letter-spacing: .3px;
}
.btn-calc:hover { background: var(--primary-dk); }
.btn-calc:active { transform: scale(.97); }
.btn-calc svg { width: 20px; height: 20px; }

/* ── Tooltip / info ── */
.info-box {
    background: #eff6ff;
    border-left: 3px solid var(--primary);
    border-radius: 0 8px 8px 0;
    padding: 10px 14px;
    font-size: .85rem;
    color: #1e40af;
    margin-bottom: 18px;
}
.info-box strong { display: block; margin-bottom: 2px; }

/* ── Idle section ── */
.idle-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 10px;
}
.idle-row {
    background: #f8fafc;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
}
.idle-row label { margin-bottom: 4px; }

/* ── Responsive ── */
@media (max-width: 560px) {
    .page-header h1 { font-size: 1.25rem; }
    .type-tab { padding: 7px 11px; font-size: .82rem; }
    .result-value { font-size: 2rem; }
}

/* ── KHs section ── */
#khs-section {
    display: none;
    background: #fffbeb;
    border: 1.5px solid #fde68a;
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 10px;
}
#khs-section label { color: #92400e; }

/* ── Footer ── */
.page-footer {
    text-align: center;
    padding: 24px 16px;
    font-size: .8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}