/* ========================================
   QR Payment — Minimal Design System
   Font: Be Vietnam Pro
   Palette: Warm neutrals + single accent
   ======================================== */

:root {
    --bg: #f5f3ef;
    --surface: #ffffff;
    --surface-alt: #faf9f7;
    --text: #1a1a1a;
    --text-secondary: #6b6560;
    --text-muted: #a8a29e;
    --border: #e7e5e0;
    --border-focus: #1a1a1a;
    --accent: #c05621;
    --accent-soft: #fff3e8;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ---- Page Wrapper ---- */
.page-wrapper {
    max-width: 880px;
    margin: 0 auto;
    padding: 48px 24px 64px;
}

/* ---- Header ---- */
.page-header {
    text-align: center;
    margin-bottom: 36px;
}

.header-line {
    width: 40px;
    height: 3px;
    background: var(--accent);
    margin: 0 auto 20px;
    border-radius: 2px;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 4px;
}

.header-sub {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* ---- Quick Accounts ---- */
.quick-accounts {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 32px;
}

.quick-account-btn {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 7px 14px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.quick-account-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

/* ---- Main Layout ---- */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 32px;
    align-items: start;
}

/* ---- Form Panel ---- */
.form-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: var(--shadow-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group input,
.form-group select {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--surface);
    color: var(--text);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-group input::placeholder {
    color: var(--text-muted);
    font-weight: 300;
}

.form-group input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(26, 26, 26, 0.06);
}

.input-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.input-row input {
    flex: 1;
}

/* Amount badge */
.amount-badge {
    display: none;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 100px;
    background: var(--accent);
    color: #fff;
    text-transform: none;
    letter-spacing: 0;
}

.amount-badge.visible {
    display: inline-block;
}

/* Quick amount chips */
.quick-amounts {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 2px;
}

.chip {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 5px 14px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--surface-alt);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.chip:hover {
    border-color: var(--text);
    color: var(--text);
    background: var(--surface);
}

/* Generate button */
.btn-generate {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    background: var(--text);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    margin-top: 4px;
}

.btn-generate:hover {
    background: #333;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-generate:active {
    transform: translateY(0);
}

/* ---- Result Panel ---- */
.result-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    position: relative;
}

/* Placeholder */
.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
    text-align: center;
}

.qr-placeholder span {
    font-size: 0.9rem;
    font-weight: 400;
}

/* QR Result */
.qr-result {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    animation: fadeUp 0.4s ease-out;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.qr-image-wrap {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    line-height: 0;
}

.qr-image-wrap img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

/* Payment Info */
.payment-info {
    width: 100%;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    font-size: 0.85rem;
    line-height: 1.8;
}

.payment-info .info-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
}

.payment-info .info-label {
    color: var(--text-muted);
    font-weight: 400;
    white-space: nowrap;
    flex-shrink: 0;
}

.payment-info .info-value {
    color: var(--text);
    font-weight: 600;
    text-align: right;
    word-break: break-all;
}

.payment-info .info-row + .info-row {
    margin-top: 4px;
    padding-top: 4px;
    border-top: 1px solid var(--border);
}

.payment-info .info-row.highlight .info-value {
    color: var(--accent);
    font-size: 1rem;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 10px;
    width: 100%;
}

.btn-action {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-action:hover {
    border-color: var(--text);
    color: var(--text);
    background: var(--surface-alt);
}

.btn-action.copied {
    border-color: #16a34a;
    color: #16a34a;
    background: #f0fdf4;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text);
    color: #fff;
    padding: 10px 24px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 1000;
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ---- Select2 Overrides ---- */
.select2-container--default .select2-selection--single {
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-sm) !important;
    height: 42px !important;
    display: flex !important;
    align-items: center !important;
    padding: 0 12px !important;
    background: var(--surface) !important;
    transition: border-color var(--transition) !important;
}

.select2-container--default .select2-selection--single:hover {
    border-color: var(--text-secondary) !important;
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif !important;
    font-size: 0.95rem !important;
    color: var(--text) !important;
    line-height: 1.4 !important;
    padding: 0 !important;
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    height: 100% !important;
    right: 8px !important;
}

.select2-container--default .select2-selection--single .select2-selection__placeholder {
    color: var(--text-muted) !important;
}

.select2-dropdown {
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-sm) !important;
    box-shadow: var(--shadow-lg) !important;
    margin-top: 4px !important;
    overflow: hidden;
}

.select2-results__option {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif !important;
    font-size: 0.88rem !important;
    padding: 8px 14px !important;
}

.select2-container--default .select2-results__option--highlighted.select2-results__option--selectable {
    background: var(--surface-alt) !important;
    color: var(--text) !important;
}

.select2-container--default .select2-results__option--selected {
    background: var(--accent-soft) !important;
    color: var(--accent) !important;
}

.select2-search--dropdown .select2-search__field {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-sm) !important;
    padding: 8px 12px !important;
    font-size: 0.9rem !important;
}

.select2-search--dropdown .select2-search__field:focus {
    border-color: var(--border-focus) !important;
    outline: none !important;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .page-wrapper {
        padding: 16px 0 40px;
        max-width: 100%;
    }

    .page-header {
        margin-bottom: 24px;
        padding: 0 16px;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .quick-accounts {
        padding: 0 16px;
        margin-bottom: 20px;
    }

    .main-layout {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 0;
    }

    .form-panel,
    .result-panel {
        border-radius: 0;
        border-left: none;
        border-right: none;
        padding: 24px 16px;
    }

    .result-panel {
        min-height: auto;
    }

    .qr-image-wrap img {
        max-width: 240px;
    }

    .action-buttons {
        flex-direction: column;
    }
}