/* ============================================================
   BAYKOS Pay — Webmin-подобная тёмная тема (v3)
   ============================================================ */

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

:root {
    --sidebar-bg:    #1e2430;
    --sidebar-hover: #2a3140;
    --sidebar-act:   #2f3a4d;
    --sidebar-text:  #c8d0dc;
    --sidebar-muted: #7d8899;
    --topbar-bg:     #2b3341;
    --topbar-text:   #e8edf3;
    --main-bg:       #f0f2f5;
    --card-bg:       #ffffff;
    --text:          #1a1f2a;
    --muted:         #6b7280;
    --border:        #dfe3ea;
    --accent:        #4f7ee8;
    --accent-hover:  #3f6ad8;
    --success:       #2f9e5b;
    --error:         #c0392b;
    --warning:       #d08700;
    --info-bg:       #eef4ff;
    --info-border:   #c9dafd;
    --error-bg:      #fdeeec;
    --error-border:  #f3c4bf;
    --sidebar-w:     260px;
    --topbar-h:      48px;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--main-bg);
    min-height: 100vh;
}

/* ============================================================
   Topbar
   ============================================================ */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: var(--topbar-bg);
    color: var(--topbar-text);
    display: flex;
    align-items: center;
    padding: 0 16px;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,.15);
}

.topbar-title {
    font-weight: 600;
    font-size: 15px;
    margin-left: 8px;
}

.topbar-user {
    margin-left: auto;
    font-size: 13px;
    color: #a9b4c4;
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--topbar-text);
    font-size: 22px;
    cursor: pointer;
    padding: 4px 8px;
    line-height: 1;
}

/* ============================================================
   Layout
   ============================================================ */
.layout {
    display: flex;
    padding-top: var(--topbar-h);
    min-height: 100vh;
}

/* ============================================================
   Sidebar
   ============================================================ */
.sidebar {
    width: var(--sidebar-w);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--topbar-h);
    bottom: 0;
    left: 0;
    overflow-y: auto;
    z-index: 90;
}

.sidebar-header {
    padding: 16px 20px 8px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--sidebar-muted);
}

.sidebar-nav {
    flex: 1;
    padding: 4px 0;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: background .15s, border-color .15s;
}

.sidebar-item:hover {
    background: var(--sidebar-hover);
}

.sidebar-item.active {
    background: var(--sidebar-act);
    border-left-color: var(--accent);
}

.sidebar-icon {
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(255,255,255,.06);
    border-radius: 8px;
    font-size: 16px;
    flex-shrink: 0;
}

.sidebar-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.sidebar-title {
    font-weight: 600;
    font-size: 14px;
    color: #e8edf3;
}

.sidebar-desc {
    font-size: 12px;
    color: var(--sidebar-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: 16px 20px;
    font-size: 12px;
    color: var(--sidebar-muted);
    border-top: 1px solid rgba(255,255,255,.05);
}

/* ============================================================
   Main
   ============================================================ */
.main {
    flex: 1;
    margin-left: var(--sidebar-w);
    padding: 24px;
    max-width: 100%;
    min-width: 0;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 28px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    max-width: 560px;
}

.card + .card {
    margin-top: 20px;
}

.card-title {
    margin: 0 0 6px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
}

.card-subtitle {
    margin: 0 0 24px;
    font-size: 13px;
    color: var(--muted);
}

/* ============================================================
   Форма
   ============================================================ */
.form-row {
    margin-bottom: 20px;
    position: relative;
}

.form-row label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.form-row input[type="text"],
.form-row input[type="number"] {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text);
    background: #fff;
    transition: border-color .15s, box-shadow .15s;
}

.form-row input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79,126,232,.15);
}

.form-row input:disabled {
    background: #f7f8fa;
    color: var(--muted);
    cursor: not-allowed;
}

.field-hint {
    margin-top: 6px;
    font-size: 12px;
    color: var(--muted);
    min-height: 16px;
}

.field-hint.error {
    color: var(--error);
}

.field-hint.success {
    color: var(--success);
}

/* ============================================================
   Сумма
   ============================================================ */
.amount-wrap {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.amount-wrap input {
    flex: 1;
    min-width: 140px;
}

.quick-amounts {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.quick-amounts button {
    padding: 12px 14px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    color: var(--text);
    font-family: inherit;
    transition: border-color .15s, color .15s, background .15s;
}

.quick-amounts button:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: #f8faff;
}

/* ============================================================
   Способы оплаты (радио)
   ============================================================ */
.payment-methods-radio {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: border-color .15s, background .15s;
    background: #fff;
}

.radio-option:hover {
    border-color: #c7d2fe;
}

.radio-option:has(input:checked) {
    border-color: var(--accent);
    background: #f5f3ff;
}

.radio-option input[type="radio"] {
    margin: 0;
    accent-color: var(--accent);
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.radio-icon {
    font-size: 22px;
    width: 36px;
    text-align: center;
    flex-shrink: 0;
}

.radio-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.radio-text strong {
    font-size: 15px;
}

.radio-text small {
    font-size: 12px;
    color: var(--muted);
}

/* ============================================================
   Инфо-блок
   ============================================================ */
.info-box {
    margin: 0 0 20px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    line-height: 1.5;
    background: var(--info-bg);
    border: 1px solid var(--info-border);
    color: #234a9a;
}

.info-box.error {
    background: var(--error-bg);
    border-color: var(--error-border);
    color: #8a2820;
}

.info-box.warning {
    background: #fff8e6;
    border-color: #f2dca0;
    color: #7a5c00;
}

/* ============================================================
   Кнопка
   ============================================================ */
.btn-pay {
    width: 100%;
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background .15s;
}

.btn-pay:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-pay:disabled {
    background: #c8d3e6;
    cursor: not-allowed;
}

.btn-pay.loading {
    position: relative;
    color: transparent;
}

.btn-pay.loading::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    width: 18px; height: 18px;
    margin: -9px 0 0 -9px;
    border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.secure-note {
    margin-top: 14px;
    font-size: 12px;
    text-align: center;
    color: var(--muted);
}

.secure-note a {
    color: var(--accent);
    text-decoration: none;
}

/* ============================================================
   Выпадашка логинов
   ============================================================ */
.input-wrap {
    position: relative;
}

.login-suggest {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    margin: 4px 0 0;
    padding: 4px 0;
    list-style: none;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,.08);
    max-height: 220px;
    overflow-y: auto;
    z-index: 10;
    display: none;
}

.login-suggest.visible {
    display: block;
}

.login-suggest li {
    padding: 10px 14px;
    font-size: 14px;
    cursor: pointer;
    color: var(--text);
}

.login-suggest li:hover,
.login-suggest li.active {
    background: #f0f4ff;
    color: var(--accent);
}

/* ============================================================
   Overlay
   ============================================================ */
.overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 80;
    cursor: pointer;
}

.overlay.visible {
    display: block;
}

/* ============================================================
   Мобильная адаптация
   ============================================================ */
@media (max-width: 900px) {
    .menu-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform .25s ease;
        width: 80%;
        max-width: 320px;
        box-shadow: 2px 0 12px rgba(0,0,0,.25);
    }

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

    .main {
        margin-left: 0;
        padding: 16px;
    }

    .card {
        padding: 20px;
        border-radius: 10px;
        max-width: 100%;
    }

    .card-title {
        font-size: 18px;
    }

    .amount-wrap {
        flex-direction: column;
    }

    .quick-amounts {
        width: 100%;
    }

    .quick-amounts button {
        flex: 1;
        padding: 10px 8px;
    }

    .topbar-user {
        display: none;
    }
}

@media (max-width: 480px) {
    .quick-amounts button {
        font-size: 12px;
        padding: 10px 4px;
    }

    .main {
        padding: 12px;
    }

    .card {
        padding: 16px;
    }

    .card-title {
        font-size: 17px;
    }
}

@media (min-width: 901px) {
    .overlay,
    .overlay.visible {
        display: none !important;
    }
}