/* ==========================================================================
   BILL DETAILS & BILL MANAGEMENT INTERFACE (REBUILT UI/UX)
   Theme: Clean Modern Flat + Micro-Interactions + Sarabun/IBM Plex Thai
   ========================================================================== */

:root {
    --bill-font-family: 'Sarabun', 'IBM Plex Sans Thai', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --bill-navy: #0F172A;
    --bill-slate-dark: #1E293B;
    --bill-slate-mid: #334155;
    --bill-slate-muted: #64748B;
    --bill-slate-light: #94A3B8;
    --bill-border: #E2E8F0;
    --bill-border-subtle: #F1F5F9;
    --bill-bg-subtle: #F8FAFC;
    --bill-white: #FFFFFF;

    /* Semantic Action Colors */
    --bill-blue: #2563EB;
    --bill-blue-hover: #1D4ED8;
    --bill-blue-light: #EFF6FF;
    --bill-blue-border: #BFDBFE;

    --bill-green: #059669;
    --bill-green-hover: #047857;
    --bill-green-light: #ECFDF5;
    --bill-green-border: #A7F3D0;
    --bill-green-text: #065F46;

    --bill-indigo: #4F46E5;
    --bill-indigo-hover: #4338CA;
    --bill-indigo-light: #EEF2FF;
    --bill-indigo-border: #C7D2FE;
    --bill-indigo-text: #3730A3;

    --bill-amber: #D97706;
    --bill-amber-hover: #B45309;
    --bill-amber-light: #FFFBEB;
    --bill-amber-border: #FDE68A;
    --bill-amber-text: #92400E;

    --bill-red: #DC2626;
    --bill-red-hover: #B91C1C;
    --bill-red-light: #FEF2F2;
    --bill-red-border: #FECACA;
    --bill-red-text: #991B1B;

    --bill-radius-sm: 8px;
    --bill-radius-md: 12px;
    --bill-radius-lg: 16px;
    --bill-radius-full: 9999px;

    --bill-shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --bill-shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
    --bill-shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12), 0 4px 8px -2px rgba(15, 23, 42, 0.04);
    --bill-shadow-modal: 0 25px 60px -15px rgba(15, 23, 42, 0.3), 0 0 0 1px rgba(15, 23, 42, 0.05);

    --bill-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --bill-transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base resets & typography for bill views */
.bill-workspace,
.bill-editor,
.bill-confirm-dialog {
    font-family: var(--bill-font-family);
    color: var(--bill-navy);
    -webkit-font-smoothing: antialiased;
    box-sizing: border-box;
}

.bill-workspace *,
.bill-editor *,
.bill-confirm-dialog * {
    box-sizing: border-box;
}

/* ==========================================================================
   MAIN BILL MODAL CONTAINER (.bill-editor)
   ========================================================================== */

dialog.bill-editor:not([open]) {
    display: none !important;
}

dialog.bill-editor {
    width: min(980px, calc(100vw - 32px));
    max-height: calc(100dvh - 40px);
    margin: auto;
    padding: 0;
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-lg);
    background: var(--bill-white);
    box-shadow: var(--bill-shadow-modal);
    overflow: hidden;
}

dialog.bill-editor[open] {
    display: flex;
    flex-direction: column;
    animation: bill-modal-enter 0.24s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

dialog.bill-editor::backdrop {
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    animation: bill-backdrop-enter 0.22s ease-out forwards;
}

dialog.bill-editor.is-closing {
    animation: bill-modal-exit 0.18s cubic-bezier(0.4, 0, 1, 1) forwards;
}

dialog.bill-editor.is-closing::backdrop {
    animation: bill-backdrop-exit 0.18s ease-in forwards;
}

@keyframes bill-modal-enter {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(12px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes bill-modal-exit {
    from {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
    to {
        opacity: 0;
        transform: scale(0.97) translateY(8px);
    }
}

@keyframes bill-backdrop-enter {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes bill-backdrop-exit {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* ==========================================================================
   MODAL HEADER (Sticky & Polished)
   ========================================================================== */

.bill-editor-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--bill-border);
}

.bill-header-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex: 1;
}

.bill-header-text {
    min-width: 0;
}

.bill-header-text h2 {
    margin: 0;
    font-size: 1.22rem;
    font-weight: 700;
    color: var(--bill-navy);
    line-height: 1.35;
    overflow-wrap: anywhere;
}

.bill-header-text p {
    margin: 2px 0 0;
    font-size: 0.82rem;
    color: var(--bill-slate-muted);
    overflow-wrap: anywhere;
}

.bill-icon-button {
    border: none;
    background: transparent;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    font-size: 1.25rem;
    color: var(--bill-slate-muted);
    cursor: pointer;
    transition: var(--bill-transition-fast);
}

.bill-icon-button:hover {
    background: var(--bill-bg-subtle);
    color: var(--bill-navy);
    transform: scale(1.05);
}

.bill-icon-button:active {
    transform: scale(0.95);
}

.bill-back-button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    background: var(--bill-white);
    color: var(--bill-slate-mid);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--bill-transition-fast);
    flex-shrink: 0;
}

.bill-back-button:hover {
    background: var(--bill-bg-subtle);
    color: var(--bill-blue);
    border-color: var(--bill-blue-border);
}

.bill-editor-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
    scroll-behavior: smooth;
}

/* Error message banner inside dialog */
.bill-error {
    background: var(--bill-red-light);
    border: 1px solid var(--bill-red-border);
    padding: 12px 18px;
    color: var(--bill-red-text);
    margin: 14px 24px 0;
    border-radius: var(--bill-radius-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 0.88rem;
    animation: bill-slide-in 0.2s ease-out;
}

/* ==========================================================================
   HERO / BANNER & STATUS BADGES
   ========================================================================== */

.bill-status {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: var(--bill-radius-full);
    font-size: 0.76rem;
    font-weight: 600;
    white-space: nowrap;
    line-height: 1.4;
}

.bill-status::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.bill-status[data-status="PAID"] {
    background: var(--bill-green-light);
    color: var(--bill-green-text);
    border: 1px solid var(--bill-green-border);
}
.bill-status[data-status="PAID"]::before { background: var(--bill-green); }

.bill-status[data-status="PARTIAL"],
.bill-status[data-status="UNPAID"] {
    background: var(--bill-amber-light);
    color: var(--bill-amber-text);
    border: 1px solid var(--bill-amber-border);
}
.bill-status[data-status="PARTIAL"]::before,
.bill-status[data-status="UNPAID"]::before { background: var(--bill-amber); }

.bill-status[data-status="ACTIVE"] {
    background: var(--bill-blue-light);
    color: var(--bill-blue);
    border: 1px solid var(--bill-blue-border);
}
.bill-status[data-status="ACTIVE"]::before { background: var(--bill-blue); }

.bill-status[data-status="CANCELLED"] {
    background: #F1F5F9;
    color: #64748B;
    border: 1px solid #CBD5E1;
}
.bill-status[data-status="CANCELLED"]::before { background: #94A3B8; }

/* Member Hero Card */
.bill-member-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 20px;
    background: var(--bill-bg-subtle);
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-md);
    margin-bottom: 20px;
}

.bill-member-profile {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.bill-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1E3A8A 0%, #3B82F6 100%);
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.2);
}

.bill-member-info h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--bill-navy);
}

.bill-member-info p {
    margin: 3px 0 0;
    font-size: 0.82rem;
    color: var(--bill-slate-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.bill-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 500;
    background: #E2E8F0;
    color: var(--bill-slate-mid);
}

.bill-tag-line {
    background: #EBFBF3;
    color: #06C755;
    font-weight: 600;
}

/* ==========================================================================
   METRIC SUMMARY GRID & PROGRESS BAR
   ========================================================================== */

.bill-metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 20px;
}

.bill-metric-card {
    padding: 16px 18px;
    background: var(--bill-white);
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-md);
    box-shadow: var(--bill-shadow-sm);
    position: relative;
    overflow: hidden;
    transition: var(--bill-transition-fast);
}

.bill-metric-card:hover {
    box-shadow: var(--bill-shadow-md);
    border-color: #CBD5E1;
    transform: translateY(-1px);
}

.bill-metric-card dt {
    font-size: 0.76rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--bill-slate-muted);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bill-metric-card dd {
    margin: 0;
    font-size: 1.28rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--bill-navy);
    line-height: 1.2;
}

.bill-metric-card.is-remaining dd {
    color: var(--bill-amber);
}

.bill-metric-card.is-remaining.is-paid dd {
    color: var(--bill-green);
}

.bill-metric-card.is-paid-amount dd {
    color: var(--bill-green-text);
}

.bill-metric-card small {
    display: block;
    margin-top: 4px;
    font-size: 0.72rem;
    color: var(--bill-slate-light);
}

/* Payment Progress Meter */
.bill-progress-wrapper {
    margin-bottom: 24px;
    padding: 14px 18px;
    background: var(--bill-bg-subtle);
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-md);
}

.bill-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--bill-slate-mid);
}

.bill-progress-track {
    width: 100%;
    height: 8px;
    background: #E2E8F0;
    border-radius: var(--bill-radius-full);
    overflow: hidden;
}

.bill-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #10B981 0%, #059669 100%);
    border-radius: var(--bill-radius-full);
    transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   SUCCESS FEEDBACK BANNER
   ========================================================================== */

.bill-feedback-banner {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border-radius: var(--bill-radius-md);
    margin-bottom: 22px;
    animation: bill-slide-in 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.bill-feedback-banner.is-success {
    background: var(--bill-green-light);
    border: 1.5px solid var(--bill-green-border);
    color: var(--bill-green-text);
}

.bill-feedback-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bill-green);
    color: white;
    display: grid;
    place-items: center;
    font-size: 1.1rem;
    flex-shrink: 0;
    animation: bill-pulse 0.4s ease-out;
}

.bill-feedback-text strong {
    display: block;
    font-size: 0.94rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.bill-feedback-text p {
    margin: 0;
    font-size: 0.82rem;
    color: #047857;
}

@keyframes bill-pulse {
    0% { transform: scale(0.8); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes bill-slide-in {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   ACTION CARDS (MANUAL PAYMENT & TRANSFER)
   ========================================================================== */

.bill-action-card {
    border-radius: var(--bill-radius-md);
    padding: 22px;
    margin-bottom: 20px;
    transition: var(--bill-transition-fast);
    background: var(--bill-white);
    border: 1px solid var(--bill-border);
    box-shadow: var(--bill-shadow-sm);
}

.bill-action-card:focus-within {
    box-shadow: var(--bill-shadow-md);
}

.bill-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.bill-card-title-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.bill-card-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.bill-card-title-group h3 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--bill-navy);
}

.bill-card-title-group p {
    margin: 2px 0 0;
    font-size: 0.8rem;
    color: var(--bill-slate-muted);
}

.bill-card-badge {
    padding: 3px 9px;
    border-radius: var(--bill-radius-full);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Manual Payment Card - Emerald Green Theme */
.bill-action-card.card-manual-payment {
    border: 1.5px solid var(--bill-green-border);
    background: linear-gradient(180deg, #FFFFFF 0%, #F0FDF4 100%);
}

.bill-action-card.card-manual-payment .bill-card-icon {
    background: var(--bill-green-light);
    color: var(--bill-green);
    border: 1px solid var(--bill-green-border);
}

.bill-action-card.card-manual-payment .bill-card-badge {
    background: var(--bill-green-light);
    color: var(--bill-green-text);
    border: 1px solid var(--bill-green-border);
}

.bill-payment-callout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 16px 18px;
    background: var(--bill-white);
    border: 1px solid var(--bill-green-border);
    border-radius: var(--bill-radius-sm);
    margin-bottom: 16px;
}

.bill-payment-callout-text dt {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--bill-slate-muted);
    text-transform: uppercase;
}

.bill-payment-callout-text dd {
    margin: 4px 0 0;
    font-size: 1.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--bill-green);
}

/* Prominent Green Mark as Paid Button */
.btn-mark-paid {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 46px;
    padding: 12px 28px;
    background: var(--bill-green) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--bill-green) !important;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(5, 150, 105, 0.28);
    transition: var(--bill-transition-fast);
}

.btn-mark-paid:hover:not(:disabled) {
    background: var(--bill-green-hover) !important;
    border-color: var(--bill-green-hover) !important;
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.38);
    transform: translateY(-1px);
}

.btn-mark-paid:active:not(:disabled) {
    transform: scale(0.98);
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.2);
}

.btn-mark-paid:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Transfer Card - Indigo Theme (Immediately Visible) */
.bill-action-card.card-transfer {
    border: 1.5px solid var(--bill-indigo-border);
    background: linear-gradient(180deg, #FFFFFF 0%, #EEF2FF 100%);
}

.bill-action-card.card-transfer .bill-card-icon {
    background: var(--bill-indigo-light);
    color: var(--bill-indigo);
    border: 1px solid var(--bill-indigo-border);
}

.bill-action-card.card-transfer .bill-card-badge {
    background: var(--bill-indigo-light);
    color: var(--bill-indigo-text);
    border: 1px solid var(--bill-indigo-border);
}

/* Transfer Type Segmented Selector (โอนยอดหนี้ vs โอนเงินชำระ) */
.bill-transfer-type-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 16px;
    background: rgba(255, 255, 255, 0.7);
    padding: 6px;
    border-radius: var(--bill-radius-sm);
    border: 1px solid var(--bill-indigo-border);
}

.bill-transfer-type-pill {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1.5px solid transparent;
    background: transparent;
    cursor: pointer;
    transition: all var(--bill-transition-fast);
    user-select: none;
    text-align: left;
}

.bill-transfer-type-pill:hover {
    background: var(--bill-white);
}

.bill-transfer-type-pill.is-selected {
    background: var(--bill-white);
    border-color: var(--bill-indigo);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.12);
}

.bill-transfer-type-pill input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.bill-transfer-type-pill .pill-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--bill-navy);
    display: flex;
    align-items: center;
    gap: 7px;
}

.bill-transfer-type-pill.is-selected .pill-title {
    color: var(--bill-indigo);
}

.bill-transfer-type-pill .pill-subtitle {
    font-size: 0.75rem;
    color: var(--bill-slate-mid);
    margin-top: 3px;
}

/* Visual Transfer Flow Diagram */
.bill-transfer-flow {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bill-white);
    border: 1px solid var(--bill-indigo-border);
    border-radius: var(--bill-radius-sm);
    margin-bottom: 16px;
}

.bill-flow-node {
    flex: 1;
    min-width: 0;
}

.bill-flow-node dt {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--bill-slate-muted);
    text-transform: uppercase;
}

.bill-flow-node dd {
    margin: 3px 0 0;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--bill-navy);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bill-flow-arrow {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bill-indigo-light);
    color: var(--bill-indigo);
    display: grid;
    place-items: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}

/* Real-Time Transfer Preview Box */
.bill-transfer-preview {
    padding: 14px 16px;
    background: #F8FAFC;
    border: 1px solid var(--bill-border);
    border-left: 3px solid var(--bill-indigo);
    border-radius: 6px;
    font-size: 0.84rem;
    line-height: 1.6;
    color: var(--bill-slate-dark);
    margin: 14px 0 16px;
    transition: var(--bill-transition-fast);
}

.btn-transfer {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 11px 24px;
    background: var(--bill-indigo) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--bill-indigo) !important;
    border-radius: 10px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.24);
    transition: var(--bill-transition-fast);
}

.btn-transfer:hover:not(:disabled) {
    background: var(--bill-indigo-hover) !important;
    border-color: var(--bill-indigo-hover) !important;
    box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

.btn-transfer:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-transfer:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Quick Fill Buttons */
.bill-quick-fill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 8px;
    background: var(--bill-bg-subtle);
    border: 1px solid var(--bill-border);
    border-radius: 4px;
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--bill-indigo);
    cursor: pointer;
    transition: var(--bill-transition-fast);
    margin-left: 8px;
}

.bill-quick-fill:hover {
    background: var(--bill-indigo-light);
    border-color: var(--bill-indigo-border);
}

/* Empty / Disabled Transfer Notice */
.bill-disabled-card-notice {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: #F8FAFC;
    border: 1px dashed #CBD5E1;
    border-radius: var(--bill-radius-sm);
    color: var(--bill-slate-muted);
    font-size: 0.85rem;
}

.bill-disabled-card-notice i {
    font-size: 1.1rem;
    color: var(--bill-slate-light);
}

/* ==========================================================================
   FORMS, INPUTS & CONTROLS
   ========================================================================== */

.bill-section {
    padding: 22px 0;
    border-bottom: 1px solid var(--bill-border);
}

.bill-section:last-child {
    border-bottom: none;
}

.bill-section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 14px;
}

.bill-section-heading h3 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--bill-navy);
}

.bill-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.bill-span-all {
    grid-column: 1 / -1;
}

.bill-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--bill-slate-mid);
    min-width: 0;
}

.bill-field input,
.bill-field textarea,
.bill-field select {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    padding: 10px 14px;
    background: var(--bill-white);
    color: var(--bill-navy);
    font: inherit;
    font-size: 0.9rem;
    line-height: 1.5;
    transition: var(--bill-transition-fast);
}

.bill-field input:focus,
.bill-field textarea:focus,
.bill-field select:focus {
    border-color: var(--bill-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
    outline: none;
}

.bill-field input:disabled,
.bill-field textarea:disabled,
.bill-field select:disabled {
    background: #F1F5F9;
    color: #64748B;
    cursor: not-allowed;
    border-color: #E2E8F0;
}

.bill-field textarea {
    resize: vertical;
    min-height: 72px;
}

.bill-field small {
    display: block;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--bill-slate-muted);
}

.bill-check {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--bill-slate-mid);
    cursor: pointer;
}

.bill-check input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    cursor: pointer;
    accent-color: var(--bill-blue);
}

.bill-form-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 0 4px;
}

.bill-form-footer span {
    font-size: 0.8rem;
    color: var(--bill-slate-muted);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.bill-editor .btn,
.bill-workspace .btn,
.bill-confirm-dialog .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 9px 20px;
    border-radius: var(--bill-radius-sm);
    font: inherit;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--bill-transition-fast);
    text-decoration: none;
    line-height: 1.4;
}

.bill-editor .btn-primary,
.bill-workspace .btn-primary {
    background: var(--bill-blue);
    color: #FFFFFF;
    border: 1px solid var(--bill-blue);
}

.bill-editor .btn-primary:hover:not(:disabled),
.bill-workspace .btn-primary:hover:not(:disabled) {
    background: var(--bill-blue-hover);
    border-color: var(--bill-blue-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.bill-editor .btn-outline,
.bill-workspace .btn-outline {
    background: var(--bill-white);
    color: var(--bill-slate-mid);
    border: 1px solid var(--bill-border);
}

.bill-editor .btn-outline:hover:not(:disabled),
.bill-workspace .btn-outline:hover:not(:disabled) {
    background: var(--bill-bg-subtle);
    border-color: #CBD5E1;
    color: var(--bill-navy);
}

.bill-editor .btn-danger-outline {
    background: var(--bill-white);
    color: var(--bill-red);
    border: 1px solid var(--bill-red-border);
}

.bill-editor .btn-danger-outline:hover:not(:disabled) {
    background: var(--bill-red-light);
    border-color: var(--bill-red);
}

.bill-editor button:disabled,
.bill-workspace button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none !important;
}

.bill-text-button {
    padding: 6px 0;
    color: var(--bill-blue);
    background: transparent;
    border: none;
    font: inherit;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--bill-transition-fast);
}

.bill-text-button:hover {
    color: var(--bill-blue-hover);
    text-decoration: underline;
}

/* ==========================================================================
   PARENT BILL MEMBERS TABLE & CARDS
   ========================================================================== */

.bill-table-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.bill-search-box {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.bill-search-box input {
    width: 100%;
    padding: 9px 12px 9px 36px;
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    font: inherit;
    font-size: 0.86rem;
    background: var(--bill-white);
    transition: var(--bill-transition-fast);
}

.bill-search-box input:focus {
    border-color: var(--bill-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    outline: none;
}

.bill-search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--bill-slate-light);
    font-size: 0.85rem;
    pointer-events: none;
}

.bill-table-scroll {
    overflow-x: auto;
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    background: var(--bill-white);
}

.bill-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.86rem;
}

.bill-table th {
    color: var(--bill-slate-muted);
    background: var(--bill-bg-subtle);
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--bill-border);
    white-space: nowrap;
}

.bill-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--bill-border-subtle);
    vertical-align: middle;
}

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

.bill-table tr:hover td {
    background: #FBFDFF;
}

.bill-table td strong {
    display: block;
    color: var(--bill-navy);
    font-weight: 600;
}

.bill-table td small {
    display: block;
    color: var(--bill-slate-muted);
    font-size: 0.76rem;
    margin-top: 2px;
}

/* Member candidate selection picker */
.bill-picker-tools {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 10px 0;
    font-size: 0.82rem;
}

.bill-picker-tools span {
    margin-right: auto;
    font-weight: 600;
    color: var(--bill-slate-mid);
}

.bill-member-picker {
    max-height: 240px;
    overflow-y: auto;
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bill-white);
}

.bill-pick-member {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    cursor: pointer;
    border-bottom: 1px solid var(--bill-border-subtle);
    border-right: 1px solid var(--bill-border-subtle);
    transition: var(--bill-transition-fast);
}

.bill-pick-member:hover {
    background: var(--bill-bg-subtle);
}

.bill-pick-member input {
    width: 17px;
    height: 17px;
    accent-color: var(--bill-blue);
    flex-shrink: 0;
}

.bill-pick-member span {
    display: flex;
    flex-direction: column;
    min-width: 0;
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--bill-navy);
}

.bill-pick-member small {
    font-size: 0.74rem;
    font-weight: 400;
    color: var(--bill-slate-muted);
}

/* ==========================================================================
   AUDIT & HISTORY TIMELINE
   ========================================================================== */

.bill-history-card {
    border-radius: var(--bill-radius-md);
    border: 1px solid var(--bill-border);
    background: var(--bill-white);
    padding: 20px;
    margin-bottom: 20px;
}

.bill-history {
    list-style: none;
    padding: 0;
    margin: 0;
    position: relative;
}

.bill-history::before {
    content: '';
    position: absolute;
    left: 17px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: var(--bill-border);
}

.bill-history-item {
    position: relative;
    padding-left: 44px;
    padding-bottom: 18px;
}

.bill-history-item:last-child {
    padding-bottom: 0;
}

.bill-history-icon {
    position: absolute;
    left: 6px;
    top: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bill-white);
    border: 2px solid var(--bill-blue);
    color: var(--bill-blue);
    display: grid;
    place-items: center;
    font-size: 0.65rem;
    z-index: 1;
}

.bill-history-item.is-transfer .bill-history-icon {
    border-color: var(--bill-indigo);
    color: var(--bill-indigo);
}

.bill-history-item.is-manual .bill-history-icon {
    border-color: var(--bill-green);
    color: var(--bill-green);
}

.bill-history-content {
    background: var(--bill-bg-subtle);
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    padding: 12px 16px;
}

.bill-history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
}

.bill-history-header strong {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--bill-navy);
}

.bill-history-header small {
    font-size: 0.74rem;
    color: var(--bill-slate-muted);
}

.bill-history-reason {
    margin: 4px 0 8px;
    font-size: 0.82rem;
    color: var(--bill-slate-mid);
    line-height: 1.4;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.bill-history-deltas {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.74rem;
    color: var(--bill-slate-muted);
    border-top: 1px dashed var(--bill-border);
    padding-top: 6px;
    margin-top: 6px;
    flex-wrap: wrap;
}

/* ==========================================================================
   ARCHIVE & DANGER ZONE
   ========================================================================== */

.bill-archive-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 20px;
    background: #FFFBFB;
    border: 1px solid var(--bill-red-border);
    border-radius: var(--bill-radius-md);
    margin-top: 24px;
}

.bill-archive-footer strong {
    display: block;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--bill-red-text);
}

.bill-archive-footer p {
    margin: 2px 0 0;
    font-size: 0.78rem;
    color: var(--bill-slate-muted);
}

.bill-metadata {
    margin-top: 18px;
    font-size: 0.74rem;
    color: var(--bill-slate-light);
    line-height: 1.5;
    text-align: center;
}

/* ==========================================================================
   CUSTOM CONFIRMATION DIALOG (.bill-confirm-dialog)
   ========================================================================== */

dialog.bill-confirm-dialog:not([open]) {
    display: none !important;
}

dialog.bill-confirm-dialog {
    box-sizing: border-box;
    width: min(500px, calc(100vw - 32px));
    max-width: none;
    max-height: calc(100dvh - 32px);
    overflow-y: auto;
    margin: auto;
    padding: 24px;
    border: 1px solid var(--bill-border);
    border-radius: 18px;
    background: var(--bill-white);
    color: var(--bill-navy);
    box-shadow: var(--bill-shadow-modal);
    z-index: 99999;
}

dialog.bill-confirm-dialog[open] {
    display: block;
    animation: bill-confirm-enter 0.22s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

dialog.bill-confirm-dialog::backdrop {
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    animation: bill-backdrop-enter 0.2s ease-out forwards;
}

dialog.bill-confirm-dialog.is-closing {
    animation: bill-confirm-exit 0.16s ease-in forwards;
}

dialog.bill-confirm-dialog.is-closing::backdrop {
    animation: bill-backdrop-exit 0.16s ease-in forwards;
}

@keyframes bill-confirm-enter {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(8px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes bill-confirm-exit {
    from {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
    to {
        opacity: 0;
        transform: scale(0.96) translateY(6px);
    }
}

.bill-confirm-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.bill-confirm-icon-badge {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-size: 1.35rem;
    flex-shrink: 0;
}

.bill-confirm-icon-badge.type-warning {
    background: var(--bill-amber-light);
    color: var(--bill-amber);
    border: 1px solid var(--bill-amber-border);
}

.bill-confirm-icon-badge.type-success {
    background: var(--bill-green-light);
    color: var(--bill-green);
    border: 1px solid var(--bill-green-border);
}

.bill-confirm-header h2 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--bill-navy);
}

.bill-confirm-warning-box {
    padding: 14px 16px;
    background: var(--bill-amber-light);
    border: 1px solid var(--bill-amber-border);
    border-left: 4px solid var(--bill-amber);
    border-radius: var(--bill-radius-sm);
    color: var(--bill-amber-text);
    font-size: 0.86rem;
    line-height: 1.5;
    margin-bottom: 18px;
}

.bill-confirm-warning-box strong {
    display: block;
    margin-bottom: 4px;
    color: #78350F;
}

.bill-confirm-details {
    background: var(--bill-bg-subtle);
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    padding: 14px 16px;
    margin-bottom: 20px;
    font-size: 0.85rem;
}

.bill-confirm-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid var(--bill-border-subtle);
}

.bill-confirm-row:last-child {
    border-bottom: none;
}

.bill-confirm-row span:first-child {
    color: var(--bill-slate-muted);
}

.bill-confirm-row span:last-child {
    font-weight: 600;
    color: var(--bill-navy);
    text-align: right;
}

.bill-confirm-actions {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 12px;
}

/* ==========================================================================
   WORKSPACE LIST VIEW (.bill-workspace)
   ========================================================================== */

.bill-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.bill-toolbar h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin: 0;
    color: var(--bill-navy);
}

.bill-toolbar p {
    margin: 4px 0 0;
    font-size: 0.86rem;
    color: var(--bill-slate-muted);
}

.bill-list-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 18px 0 16px;
}

.bill-filter-button {
    background: var(--bill-white);
    border: 1px solid var(--bill-border);
    border-radius: var(--bill-radius-sm);
    padding: 8px 16px;
    color: var(--bill-slate-mid);
    font: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--bill-transition-fast);
}

.bill-filter-button:hover {
    background: var(--bill-bg-subtle);
    border-color: #CBD5E1;
}

.bill-filter-button[aria-pressed="true"] {
    background: var(--bill-blue-light);
    color: var(--bill-blue);
    border-color: var(--bill-blue);
    font-weight: 600;
}

.bill-list {
    border: 1px solid var(--bill-border);
    background: var(--bill-white);
    border-radius: var(--bill-radius-md);
    overflow: hidden;
    box-shadow: var(--bill-shadow-sm);
}

.bill-list-row {
    display: grid;
    grid-template-columns: minmax(200px, 1.3fr) minmax(300px, 1.4fr) auto;
    gap: 20px;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--bill-border);
    transition: var(--bill-transition-fast);
}

.bill-list-row:last-child {
    border-bottom: none;
}

.bill-list-row:hover {
    background: #FAFCFF;
}

.bill-list-title h3 {
    margin: 0 0 4px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--bill-navy);
    overflow-wrap: anywhere;
}

.bill-list-title p {
    color: var(--bill-slate-muted);
    font-size: 0.82rem;
    margin: 0 0 8px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.bill-list-row dl {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin: 0;
}

.bill-list-row dt {
    color: var(--bill-slate-muted);
    font-size: 0.74rem;
    font-weight: 600;
    text-transform: uppercase;
}

.bill-list-row dd {
    margin: 3px 0 0;
    font-weight: 700;
    font-size: 0.95rem;
    font-variant-numeric: tabular-nums;
    color: var(--bill-navy);
}

.bill-empty {
    padding: 48px 24px;
    text-align: center;
    color: var(--bill-slate-muted);
    font-size: 0.92rem;
}

/* Common utilities */
.bill-muted {
    color: var(--bill-slate-muted);
    font-size: 0.84rem;
}

.bill-notice {
    background: var(--bill-blue-light);
    color: var(--bill-blue);
    border-left: 3px solid var(--bill-blue);
    margin: 14px 0;
    padding: 12px 14px;
    font-size: 0.84rem;
    border-radius: 4px;
    white-space: pre-line;
}

.bill-editor [hidden] {
    display: none !important;
}

.bill-editor :focus-visible,
.bill-workspace :focus-visible,
.bill-confirm-dialog :focus-visible {
    outline: 3px solid var(--bill-blue);
    outline-offset: 2px;
}

.bill-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Desktop, Tablet, Mobile)
   ========================================================================== */

@media (max-width: 1024px) {
    .bill-list-row {
        grid-template-columns: 1fr auto;
    }
    .bill-list-row dl {
        grid-row: 2;
        grid-column: 1 / -1;
    }
    .bill-list-row > button {
        grid-column: 2;
        grid-row: 1;
    }
    .bill-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 680px) {
    dialog.bill-editor {
        width: calc(100vw - 16px);
        max-height: calc(100dvh - 16px);
        border-radius: var(--bill-radius-md);
    }

    .bill-editor-header {
        padding: 12px 16px;
    }

    .bill-editor-body {
        padding: 16px;
    }

    .bill-member-hero {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .bill-metrics-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .bill-metric-card dd {
        font-size: 1.1rem;
    }

    .bill-form-grid,
    .bill-member-picker,
    .bill-transfer-type-selector {
        grid-template-columns: 1fr;
    }

    .bill-payment-callout {
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
        text-align: center;
    }

    .btn-mark-paid,
    .btn-transfer {
        width: 100%;
        min-height: 48px;
    }

    .bill-confirm-actions {
        grid-template-columns: 1fr;
    }

    .bill-form-footer,
    .bill-archive-footer,
    .bill-section-heading {
        align-items: stretch;
        flex-direction: column;
        gap: 10px;
    }

    .bill-list-row {
        padding: 16px;
        gap: 14px;
    }

    .bill-list-row dl {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .bill-editor input,
    .bill-editor textarea,
    .bill-editor select {
        font-size: 16px; /* Prevents auto-zoom in iOS Safari */
    }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    dialog.bill-editor,
    dialog.bill-editor[open],
    dialog.bill-editor.is-closing,
    dialog.bill-editor::backdrop,
    dialog.bill-confirm-dialog,
    dialog.bill-confirm-dialog[open],
    dialog.bill-confirm-dialog.is-closing,
    dialog.bill-confirm-dialog::backdrop,
    .bill-feedback-banner,
    .bill-feedback-icon,
    .bill-progress-fill {
        animation: none !important;
        transition: none !important;
    }
}