/* ==========================================================================
   SONGMA INVEST - BESS CALCULATOR STYLESHEET
   Clean, Elegant, Spacious, Light-Weight Typography & Generous Margins
   Design System Tokens: --primary (#005A9E), --accent (#F05A28), --bg-body (#F8FAFC)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Compact & Airy Hero Section
   -------------------------------------------------------------------------- */
.calc-hero {
    background: #0A2540;
    color: #FFFFFF;
    padding: 50px 0 44px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.calc-hero-inner {
    max-width: 780px;
}

.calc-hero-title {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 1.85rem;
    font-weight: 700;
    color: #FFFFFF !important;
    line-height: 1.3;
    margin-bottom: 10px;
    letter-spacing: -0.3px;
}

.calc-hero-desc {
    font-size: 0.88rem;
    color: #94A3B8;
    line-height: 1.6;
    font-weight: 400;
    margin: 0;
}

.breadcrumbs {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    color: #64748B;
}

.breadcrumbs a {
    color: #38BDF8;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s ease;
}

.breadcrumbs a:hover {
    color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   2. Workspace & Segmented Customer Control (Generous Spacing)
   -------------------------------------------------------------------------- */
.calc-workspace {
    background: #F8FAFC;
    padding: 48px 0 96px;
}

.calc-customer-selector {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 32px !important;
}

.segment-control {
    display: inline-flex;
    background: #E2E8F0;
    padding: 4px;
    border-radius: var(--radius-full, 9999px);
    gap: 4px;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

.segment-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 20px;
    border-radius: var(--radius-full, 9999px);
    border: none;
    background: transparent;
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 0.82rem;
    font-weight: 500;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.segment-btn i {
    width: 15px;
    height: 15px;
    opacity: 0.85;
}

.segment-btn:hover {
    color: #0F172A;
}

.segment-btn.active {
    background: #FFFFFF;
    color: var(--primary, #005A9E);
    font-weight: 600;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

/* --------------------------------------------------------------------------
   3. Main 2-Column Balanced Grid (Generous 36px Gap)
   -------------------------------------------------------------------------- */
.calc-layout-grid {
    display: grid;
    grid-template-columns: 410px 1fr;
    gap: 36px;
    align-items: flex-start;
}

.calc-panel {
    background: #FFFFFF;
    border-radius: 18px;
    padding: 30px 28px;
    border: 1px solid #E2E8F0;
    box-shadow: 0 4px 16px -2px rgba(0, 0, 0, 0.03);
}

.control-row {
    margin-bottom: 26px !important;
}

.control-label-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.control-label {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 0.84rem;
    font-weight: 600;
    color: #1E293B;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 0;
}

.control-label i {
    width: 15px;
    height: 15px;
    color: var(--primary, #005A9E);
}

.radiation-badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.72rem;
    font-weight: 600;
    color: #B45309;
    background: #FEF3C7;
    padding: 2px 9px;
    border-radius: 9999px;
}

.select-wrapper {
    position: relative;
}

.calc-select-field {
    width: 100%;
    padding: 9px 14px;
    border-radius: 10px;
    border: 1.5px solid #CBD5E1;
    background: #FFFFFF;
    font-size: 0.86rem;
    font-weight: 500;
    color: #0F172A;
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.calc-select-field:focus {
    border-color: var(--primary, #005A9E);
    box-shadow: 0 0 0 3px rgba(0, 90, 158, 0.1);
}

/* Bill Pill Input & Slider */
.bill-input-pill {
    display: inline-flex;
    align-items: baseline;
    background: #F0F6FF;
    border: 1px solid #BAE6FD;
    padding: 3px 10px;
    border-radius: 7px;
}

.bill-number-input {
    border: none;
    background: transparent;
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 1.12rem;
    font-weight: 700;
    color: var(--primary, #005A9E);
    width: 120px;
    text-align: right;
    outline: none;
}

.bill-unit {
    font-size: 0.75rem;
    font-weight: 600;
    color: #64748B;
    margin-left: 4px;
}

.minimal-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #E2E8F0;
    outline: none;
    -webkit-appearance: none;
    margin: 14px 0 6px;
}

.minimal-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent, #F05A28);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(240, 90, 40, 0.3);
    border: 2px solid #FFFFFF;
    transition: transform 0.15s ease;
}

.minimal-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: #94A3B8;
    font-weight: 400;
}

.preset-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.preset-chip {
    border: 1px solid #E2E8F0;
    background: #F8FAFC;
    padding: 3px 10px;
    border-radius: 5px;
    font-size: 0.74rem;
    font-weight: 500;
    color: #475569;
    cursor: pointer;
    transition: all 0.15s ease;
}

.preset-chip:hover {
    border-color: var(--primary, #005A9E);
    color: var(--primary, #005A9E);
}

.preset-chip.active {
    background: var(--primary, #005A9E);
    color: #FFFFFF;
    border-color: var(--primary, #005A9E);
}

/* System Switch Cards */
.system-switch-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.system-choice-card {
    border: 1.5px solid #E2E8F0;
    border-radius: 10px;
    padding: 12px 14px;
    cursor: pointer;
    background: #FFFFFF;
    transition: all 0.2s ease;
}

.system-choice-card:hover {
    border-color: #BAE6FD;
}

.system-choice-card.active {
    border-color: var(--primary, #005A9E);
    background: #F0F6FF;
    box-shadow: 0 2px 8px rgba(0, 90, 158, 0.06);
}

.choice-title {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 0.82rem;
    font-weight: 600;
    color: #0F172A;
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 3px;
}

.choice-title i {
    width: 14px;
    height: 14px;
}

.choice-desc {
    font-size: 0.7rem;
    color: #64748B;
    line-height: 1.35;
    font-weight: 400;
}

/* 3-Phase Tariff Pills */
.tariff-toggle-pills {
    display: flex;
    gap: 10px;
    background: #F8FAFC;
    padding: 6px 10px;
    border-radius: 7px;
    border: 1px solid #E2E8F0;
}

.tariff-pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.76rem;
    font-weight: 500;
    color: #334155;
    cursor: pointer;
}

.tariff-pill input {
    accent-color: var(--primary, #005A9E);
}

.evn-notice {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.72rem;
    color: #64748B;
    padding-top: 14px;
    border-top: 1px solid #F1F5F9;
    font-weight: 400;
}

.evn-notice i {
    width: 13px;
    height: 13px;
    color: #10B981;
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   4. Right Column: Hero Metrics & Financial Dashboard (Generous Airflow)
   -------------------------------------------------------------------------- */
.result-hero-card {
    background: #FFFFFF;
    border-radius: 18px;
    padding: 24px 30px;
    border: 1px solid #BAE6FD;
    box-shadow: 0 6px 20px -4px rgba(0, 90, 158, 0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #FFFFFF 0%, #F0F8FF 100%);
    margin-bottom: 24px !important;
}

.hero-metric-primary, .hero-metric-secondary {
    flex: 1;
}

.hero-metric-divider {
    width: 1px;
    height: 52px;
    background: #E2E8F0;
    margin: 0 26px;
}

.hero-metric-label {
    display: block;
    font-size: 0.74rem;
    font-weight: 500;
    color: #64748B;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 3px;
}

.hero-metric-value {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 1.65rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.3px;
}

.hero-metric-value .unit {
    font-size: 0.88rem;
    font-weight: 500;
    color: #64748B;
}

.hero-metric-sub {
    display: block;
    font-size: 0.74rem;
    color: #64748B;
    margin-top: 2px;
    font-weight: 400;
}

/* 4 Specs Clean Grid */
.specs-clean-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 24px !important;
}

.spec-card {
    background: #FFFFFF;
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    padding: 14px 14px;
    transition: all 0.2s ease;
}

.spec-card:hover {
    border-color: #BAE6FD;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.spec-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.7rem;
    font-weight: 500;
    color: #64748B;
    margin-bottom: 5px;
}

.spec-label i {
    width: 12px;
    height: 12px;
    color: var(--primary, #005A9E);
}

.spec-val {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 1.15rem;
    font-weight: 700;
    color: #0F172A;
    line-height: 1.15;
    margin-bottom: 2px;
}

.spec-val .unit {
    font-size: 0.74rem;
    font-weight: 500;
    color: #64748B;
}

.spec-sub {
    display: block;
    font-size: 0.68rem;
    color: #94A3B8;
    font-weight: 400;
}

/* Chart Clean Card */
.chart-clean-card {
    background: #FFFFFF;
    border-radius: 16px;
    border: 1px solid #E2E8F0;
    padding: 22px 24px;
    margin-bottom: 24px !important;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.chart-title {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 0.88rem;
    font-weight: 600;
    color: #0F172A;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.chart-title i {
    width: 15px;
    height: 15px;
    color: var(--primary, #005A9E);
}

.chart-tab-buttons {
    display: flex;
    gap: 6px;
}

.btn-chart-tab {
    border: 1px solid #E2E8F0;
    background: #F8FAFC;
    padding: 3px 10px;
    border-radius: 5px;
    font-size: 0.74rem;
    font-weight: 500;
    color: #64748B;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-chart-tab.active {
    background: var(--primary, #005A9E);
    color: #FFFFFF;
    border-color: var(--primary, #005A9E);
}

.chart-canvas-box {
    position: relative;
    height: 240px;
    width: 100%;
}

.eco-summary-line {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 12px;
    margin-top: 10px;
    border-top: 1px solid #F1F5F9;
    font-size: 0.74rem;
    color: #64748B;
    font-weight: 400;
}

.eco-summary-line i {
    width: 12px;
    height: 12px;
    display: inline;
}

/* Collapsible Accordion for Breakdown */
.accordion-clean {
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    background: #FFFFFF;
    overflow: hidden;
    margin-bottom: 24px !important;
}

.accordion-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    background: #FAFCFF;
    border: none;
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 0.8rem;
    font-weight: 600;
    color: #334155;
    cursor: pointer;
    transition: background 0.15s;
}

.accordion-trigger:hover {
    background: #F1F5F9;
}

.accordion-trigger span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.accordion-trigger i {
    width: 14px;
    height: 14px;
}

.toggle-icon {
    transition: transform 0.2s ease;
}

.accordion-body {
    padding: 14px 18px;
    border-top: 1px solid #E2E8F0;
    overflow-x: auto;
}

.table-clean {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.76rem;
}

.table-clean th {
    text-align: left;
    padding: 7px 10px;
    color: #64748B;
    font-weight: 500;
    border-bottom: 1.5px solid #E2E8F0;
}

.table-clean td {
    padding: 8px 10px;
    border-bottom: 1px solid #F1F5F9;
    color: #1E293B;
}

/* Action Row */
.calc-action-row {
    display: flex;
    gap: 14px;
    margin-top: 8px;
}

.calc-action-row .btn {
    padding: 11px 20px;
    font-weight: 600;
    font-size: 0.86rem;
    border-radius: var(--radius-full, 9999px);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 1.5; }

/* --------------------------------------------------------------------------
   5. Standardized Modal Popup
   -------------------------------------------------------------------------- */
.modal {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 99999 !important;
    display: none;
    align-items: center !important;
    justify-content: center !important;
    background: rgba(10, 37, 64, 0.65) !important;
    backdrop-filter: blur(4px);
    padding: 20px;
    box-sizing: border-box;
}

.modal.show, .modal[style*="display: block"], .modal[style*="display: flex"] {
    display: flex !important;
}

.modal-dialog {
    width: 100%;
    max-width: 440px;
    margin: auto;
}

.modal-content {
    background: #FFFFFF;
    border-radius: 18px;
    box-shadow: 0 25px 50px -12px rgba(10, 37, 64, 0.28);
    border: none;
    overflow: hidden;
    animation: modalPopIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalPopIn {
    0% { opacity: 0; transform: scale(0.96) translateY(8px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #F1F5F9;
}

.modal-title {
    font-family: var(--font-heading, 'Montserrat', sans-serif);
    font-size: 0.98rem;
    font-weight: 600;
    color: #0F172A;
    margin: 0;
}

.modal-header .close {
    background: #F8FAFC;
    border: none;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 1.15rem;
    color: #64748B;
    cursor: pointer;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 14px 20px;
    background: #F8FAFC;
    border-top: 1px solid #F1F5F9;
}

.alert-compact {
    background: #F0F6FF;
    border: 1px solid #BAE6FD;
    border-radius: 7px;
    padding: 9px 12px;
    font-size: 0.76rem;
    color: #0369A1;
    line-height: 1.4;
    font-weight: 400;
}

.modal-body .form-control {
    display: block;
    width: 100%;
    padding: 8px 12px;
    font-size: 0.84rem;
    border-radius: 7px;
    border: 1.5px solid #CBD5E1;
    background: #F8FAFC;
    outline: none;
    font-weight: 400;
}

.modal-body .form-control:focus {
    background: #FFFFFF;
    border-color: var(--primary, #005A9E);
    box-shadow: 0 0 0 3px rgba(0, 90, 158, 0.1);
}

.modal-body label {
    display: block;
    margin-bottom: 4px;
    font-size: 0.74rem;
    font-weight: 500;
    color: #334155;
}

/* --------------------------------------------------------------------------
   6. Responsive Layout
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .calc-layout-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 640px) {
    .calc-hero-title {
        font-size: 1.55rem;
    }
    .segment-control {
        width: 100%;
        display: flex;
    }
    .segment-btn {
        flex: 1;
        padding: 7px 8px;
        font-size: 0.74rem;
        justify-content: center;
    }
    .system-switch-grid {
        grid-template-columns: 1fr;
    }
    .result-hero-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
        padding: 18px 20px;
    }
    .hero-metric-divider {
        display: none;
    }
    .specs-clean-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .calc-action-row {
        flex-direction: column;
    }
}

/* Print Only */
.print-only { display: none; }
@media print {
    body * { visibility: hidden; }
    .print-only, .print-only * { visibility: visible; display: block; }
    .print-only { position: absolute; left: 0; top: 0; width: 100%; padding: 30px; }
}