/**
 * Công cụ tính toán điện mặt trời — tông đỏ logo (#990000) + trắng.
 */

:root {
    --sc-primary: #990000;
    --sc-primary-dark: #7a0000;
    --sc-primary-soft: rgba(153, 0, 0, 0.12);
    --sc-primary-glow: rgba(153, 0, 0, 0.22);
    --sc-bg: #f8f6f6;
    --sc-text: #0f172a;
    --sc-muted: #64748b;
    --sc-radius: 20px;
    --sc-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
    --sc-font: 'Inter', 'Roboto', system-ui, sans-serif;
}

.solar-calc-page {
    font-family: var(--sc-font);
    color: var(--sc-text);
    background: var(--sc-bg);
    letter-spacing: 0.01em;
}

/* Hero — ảnh nền do người dùng cung cấp */
.solar-calc-hero {
    position: relative;
    min-height: 220px;
    background-color: #1a0808;
    background-image: linear-gradient(
            105deg,
            rgba(45, 8, 8, 0.9) 0%,
            rgba(45, 8, 8, 0.58) 50%,
            rgba(45, 8, 8, 0.38) 100%
        ),
        var(--sc-hero-img);
    background-size: cover;
    background-position: center 35%;
}

@media (min-width: 992px) {
    .solar-calc-hero {
        min-height: 280px;
    }
}

.solar-calc-hero__inner {
    position: relative;
    z-index: 1;
    padding: 3rem 0 2.6rem;
}

.solar-calc-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 1rem;
}

.solar-calc-hero__title {
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #fff;
    font-size: clamp(1.85rem, 3.4vw, 2.6rem);
    line-height: 1.2;
    margin-bottom: 0.75rem;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}

.solar-calc-hero__lead {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.06rem;
    max-width: 38rem;
    margin: 0;
    line-height: 1.7;
}

/* Breadcrumb */
.solar-calc-breadcrumb .breadcrumb {
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.solar-calc-breadcrumb .breadcrumb-item a {
    color: #fecaca;
    text-decoration: none;
    font-weight: 500;
}

.solar-calc-breadcrumb .breadcrumb-item a:hover {
    text-decoration: underline;
}

.solar-calc-breadcrumb .breadcrumb-item.active {
    color: rgba(255, 255, 255, 0.55);
}

.solar-calc-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
    color: rgba(255, 255, 255, 0.45);
}

/* Section */
.solar-calc-section {
    padding: 3.25rem 0 4rem;
}

@media (min-width: 768px) {
    .solar-calc-section {
        padding: 3rem 0 4rem;
    }
}

/* Tabs */
.solar-calc-tabs .nav-link {
    border-radius: 14px 14px 0 0;
    font-weight: 700;
    color: var(--sc-muted);
    padding: 1rem 1.35rem;
    border: 1px solid transparent;
    transition: all 0.28s ease;
}

.solar-calc-tabs .nav-link:hover {
    color: var(--sc-primary);
}

.solar-calc-tabs .nav-link.active {
    color: var(--sc-primary);
    background: #fff;
    border-color: #e2e8f0 #e2e8f0 #fff;
    box-shadow: 0 -6px 18px rgba(15, 23, 42, 0.04);
}

.solar-calc-tab-card {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 0 var(--sc-radius) var(--sc-radius) var(--sc-radius);
    box-shadow: var(--sc-shadow);
    padding: 2rem;
    animation: sc-fade-up 0.45s ease both;
}

.solar-calc-main-wrap {
    max-width: 1120px;
}

@media (min-width: 768px) {
    .solar-calc-tab-card {
        padding: 2rem;
    }
}

.solar-calc-label {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--sc-text);
    margin-bottom: 0.55rem;
}

.solar-calc-input {
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    min-height: 52px;
    padding: 0.78rem 0.95rem;
    font-size: 1rem;
    font-weight: 600;
    width: 100%;
    transition: all 0.25s ease;
}

.solar-calc-input:focus {
    border-color: var(--sc-primary);
    box-shadow: 0 0 0 4px var(--sc-primary-soft);
    transform: translateY(-1px);
}

/* Kết quả */
.solar-calc-results {
    position: relative;
    min-height: 200px;
}

.solar-calc-results.is-loading {
    pointer-events: none;
    opacity: 0.45;
    transition: opacity 0.3s ease;
}

.solar-calc-results__spinner {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.solar-calc-results.is-loading .solar-calc-results__spinner {
    display: flex;
}

.solar-calc-spinner {
    width: 2rem;
    height: 2rem;
    border: 3px solid rgba(153, 0, 0, 0.2);
    border-top-color: var(--sc-primary);
    border-radius: 50%;
    animation: sc-spin 0.7s linear infinite;
}

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

.solar-calc-result-grid {
    display: grid;
    gap: 1.1rem;
    grid-template-columns: 1fr;
}

@media (min-width: 576px) {
    .solar-calc-result-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .solar-calc-result-grid--grid-tie {
        grid-template-columns: repeat(3, 1fr);
    }
}

.solar-calc-metric {
    background: linear-gradient(145deg, #fffafa 0%, #fff 100%);
    border: 1px solid #f0e4e4;
    border-radius: 16px;
    padding: 1.1rem 1.2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.solar-calc-metric:hover {
    transform: translateY(-5px);
    border-color: rgba(153, 0, 0, 0.28);
    box-shadow: 0 15px 28px rgba(153, 0, 0, 0.12);
}

.solar-calc-metric__icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--sc-primary-soft);
    color: var(--sc-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    margin-bottom: 0.8rem;
}

.solar-calc-btn {
    border-radius: 14px;
    padding: 0.88rem 1.05rem;
    background: linear-gradient(90deg, var(--sc-primary), #b71c1c);
    color: #fff;
    border: none;
    font-weight: 700;
    min-height: 52px;
    transition: all 0.28s ease;
}

.solar-calc-btn:hover,
.solar-calc-btn:focus {
    color: #fff;
    background: linear-gradient(90deg, var(--sc-primary-dark), var(--sc-primary));
    transform: translateY(-2px);
    box-shadow: 0 12px 22px var(--sc-primary-glow);
}

.solar-calc-metric__label {
    font-size: 0.77rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--sc-muted);
    margin-bottom: 0.25rem;
}

.solar-calc-metric__value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--sc-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.solar-calc-metric__unit {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--sc-muted);
}

/* Fade-in kết quả */
.solar-calc-fade {
    animation: sc-fade-in 0.6s ease forwards;
}

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

/* Biểu đồ */
.solar-calc-chart-wrap {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: var(--sc-radius);
    padding: 1.3rem;
    margin-top: 1.7rem;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
    animation: sc-fade-up 0.55s ease both;
}

.solar-calc-chart-wrap h3 {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--sc-text);
}

.solar-calc-chart-wrap canvas {
    max-height: 280px;
}

/* Gợi ý lưu trữ */
.solar-calc-hint-box {
    background: #fef2f2;
    border: 1px solid rgba(153, 0, 0, 0.22);
    border-radius: 14px;
    padding: 1rem 1.2rem;
    font-size: 0.93rem;
    color: #991b1b;
    line-height: 1.55;
}

.solar-calc-hint-box i {
    vertical-align: -0.1em;
}

.solar-calc-note {
    font-size: 0.88rem;
    color: var(--sc-muted);
    margin-top: 1.4rem;
    line-height: 1.6;
}

.solar-calc-title {
    font-size: 1.08rem;
    letter-spacing: 0.01em;
}

@keyframes sc-fade-up {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 767.98px) {
    .solar-calc-tab-card {
        border-radius: 0 0 14px 14px;
        padding: 1.05rem;
    }

    .solar-calc-metric__value {
        font-size: 1.22rem;
    }

    .solar-calc-hero__inner {
        padding: 2.1rem 0 1.8rem;
    }

    .solar-calc-hero__title {
        font-size: clamp(1.45rem, 6vw, 1.85rem);
    }

    .solar-calc-section {
        padding: 2rem 0 2.6rem;
    }

    .solar-calc-tabs .nav-link {
        padding: 0.85rem 0.9rem;
        font-size: 0.9rem;
    }
}