/* ================================================
   HOANG GIANG SOLAR — Solutions Pages
   Premium, Tesla-inspired design
   ================================================ */

/* ===== Design Tokens (inherit from landing-v2) ===== */
:root {
    --sol-white: #ffffff;
    --sol-off-white: #fafafa;
    --sol-gray-50: #f5f5f5;
    --sol-gray-100: #ebebeb;
    --sol-gray-200: #d6d6d6;
    --sol-gray-400: #999999;
    --sol-gray-600: #666666;
    --sol-gray-800: #333333;
    --sol-black: #111111;
    --sol-green: #00a86b;
    --sol-green-dark: #008c59;
    --sol-green-light: rgba(0,168,107,.08);
    --sol-green-glow: rgba(0,168,107,.15);
    --sol-font: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --sol-transition: .4s cubic-bezier(.25,.46,.45,.94);
    --sol-ease-out: cubic-bezier(.16,1,.3,1);
    --sol-radius: 16px;
    --sol-radius-sm: 12px;
}

/* ===== Reveal Animation ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity .8s var(--sol-ease-out), transform .8s var(--sol-ease-out);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }

/* ===== Breadcrumb ===== */
.sol-breadcrumb {
    padding: 20px 0 0;
    background: var(--sol-off-white);
}
.sol-breadcrumb ol {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 0;
    font-size: .82rem;
    color: var(--sol-gray-400);
}
.sol-breadcrumb ol li::before {
    content: '/';
    margin-right: 8px;
    color: var(--sol-gray-200);
}
.sol-breadcrumb ol li:first-child::before { display: none; }
.sol-breadcrumb ol li a {
    color: var(--sol-gray-600);
    text-decoration: none;
    transition: color .2s;
}
.sol-breadcrumb ol li a:hover { color: var(--sol-green); }
.sol-breadcrumb ol li.active { color: var(--sol-black); font-weight: 500; }

/* ===== Label ===== */
.sol-label {
    display: inline-block;
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--sol-green);
    margin-bottom: 12px;
}

/* ================================================
   LISTING PAGE
   ================================================ */

/* Hero */
.sol-hero {
    padding: 80px 0 60px;
    background: var(--sol-off-white);
    text-align: center;
}
.sol-hero-content h1 {
    font-family: var(--sol-font);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--sol-black);
    line-height: 1.15;
    letter-spacing: -.02em;
    margin: 0 0 16px;
}
.sol-hero-content p {
    font-size: clamp(.92rem, 1.5vw, 1.1rem);
    color: var(--sol-gray-600);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Solution Grid */
.sol-listing {
    padding: 60px 0 100px;
    background: var(--sol-white);
}
.sol-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: 1100px;
    margin: 0 auto;
}
.sol-card {
    display: block;
    text-decoration: none;
    color: inherit;
    border-radius: var(--sol-radius);
    overflow: hidden;
    background: var(--sol-white);
    border: 1px solid var(--sol-gray-100);
    transition: var(--sol-transition);
    position: relative;
}
.sol-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 24px 64px rgba(0,0,0,.1);
    border-color: transparent;
}
.sol-card-img {
    position: relative;
    height: 240px;
    overflow: hidden;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}
.sol-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s var(--sol-ease-out);
}
.sol-card:hover .sol-card-img img { transform: scale(1.08); }
.sol-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,.3) 0%, transparent 60%);
}
.sol-card-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255,255,255,.3);
}

.sol-card-body {
    padding: 28px 24px;
    position: relative;
}
.sol-card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--sol-green-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--sol-green);
    margin-bottom: 16px;
    transition: var(--sol-transition);
}
.sol-card:hover .sol-card-icon {
    background: var(--sol-green);
    color: var(--sol-white);
}
.sol-card-body h2 {
    font-family: var(--sol-font);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--sol-black);
    margin: 0 0 8px;
    line-height: 1.3;
}
.sol-card-body p {
    font-size: .85rem;
    color: var(--sol-gray-600);
    line-height: 1.6;
    margin: 0 0 16px;
}
.sol-card-link {
    font-size: .82rem;
    font-weight: 600;
    color: var(--sol-green);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap .3s;
}
.sol-card:hover .sol-card-link { gap: 12px; }

/* Empty state */
.sol-empty {
    text-align: center;
    padding: 80px 24px;
    color: var(--sol-gray-400);
}
.sol-empty i { font-size: 3rem; margin-bottom: 16px; }
.sol-empty h3 { font-size: 1.2rem; color: var(--sol-gray-600); margin: 0 0 8px; }
.sol-empty p { font-size: .9rem; margin: 0; }

/* CTA (listing) */
.sol-cta {
    padding: 80px 24px;
    background: var(--sol-black);
    text-align: center;
}
.sol-cta-inner {
    max-width: 640px;
    margin: 0 auto;
}
.sol-cta-inner h2 {
    font-family: var(--sol-font);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--sol-white);
    margin: 0 0 12px;
}
.sol-cta-inner p {
    font-size: .92rem;
    color: var(--sol-gray-400);
    margin: 0 0 32px;
}
.sol-cta-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Shared buttons */
.btn-sol-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--sol-green);
    color: var(--sol-white);
    font-family: var(--sol-font);
    font-size: .9rem;
    font-weight: 600;
    border-radius: 10px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--sol-transition);
}
.btn-sol-primary:hover {
    background: var(--sol-green-dark);
    color: var(--sol-white);
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0,168,107,.3);
}
.btn-sol-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: var(--sol-white);
    font-family: var(--sol-font);
    font-size: .9rem;
    font-weight: 500;
    border-radius: 10px;
    text-decoration: none;
    border: 1px solid rgba(255,255,255,.3);
    transition: var(--sol-transition);
}
.btn-sol-secondary:hover {
    background: rgba(255,255,255,.1);
    color: var(--sol-white);
    border-color: rgba(255,255,255,.6);
}
.btn-sol-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: rgba(255,255,255,.12);
    color: var(--sol-white);
    font-family: var(--sol-font);
    font-size: .9rem;
    font-weight: 500;
    border-radius: 10px;
    text-decoration: none;
    border: 1px solid rgba(255,255,255,.2);
    transition: var(--sol-transition);
    backdrop-filter: blur(8px);
}
.btn-sol-ghost:hover {
    background: rgba(255,255,255,.2);
    color: var(--sol-white);
}
.btn-sol-lg { padding: 16px 40px; font-size: .95rem; }

/* ================================================
   DETAIL PAGE
   ================================================ */

/* Detail Hero */
.sol-detail-hero {
    position: relative;
    min-height: 480px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    background: linear-gradient(135deg, #0a1628 0%, #1a2a4a 50%, #0d1b2a 100%);
    background-size: cover;
    background-position: center;
    overflow: hidden;
}
.sol-detail-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(10,22,40,.85) 0%, rgba(10,22,40,.7) 50%, rgba(10,22,40,.9) 100%);
}
.sol-detail-hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
}
.sol-detail-icon-wrap {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    background: rgba(0,168,107,.15);
    border: 1px solid rgba(0,168,107,.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--sol-green);
    margin: 0 auto 24px;
    backdrop-filter: blur(12px);
}
.sol-detail-hero-content h1 {
    font-family: var(--sol-font);
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--sol-white);
    line-height: 1.15;
    letter-spacing: -.02em;
    margin: 0 0 16px;
}
.sol-detail-subtitle {
    font-size: clamp(.92rem, 1.5vw, 1.15rem);
    color: rgba(255,255,255,.7);
    line-height: 1.6;
    margin: 0 0 32px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}
.sol-detail-hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Section Common ===== */
.sol-section {
    padding: 80px 24px;
}
.sol-bg-alt { background: var(--sol-gray-50); }
.sol-section-header {
    text-align: center;
    max-width: 560px;
    margin: 0 auto 52px;
}
.sol-section-header h2 {
    font-family: var(--sol-font);
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    font-weight: 800;
    color: var(--sol-black);
    line-height: 1.2;
    letter-spacing: -.015em;
    margin: 0;
}

/* ===== Overview ===== */
.sol-overview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}
.sol-overview-text h2 {
    font-family: var(--sol-font);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--sol-black);
    margin: 0 0 20px;
}
.sol-desc-content {
    font-size: .92rem;
    color: var(--sol-gray-600);
    line-height: 1.7;
}
.sol-overview-img img {
    width: 100%;
    border-radius: var(--sol-radius);
    aspect-ratio: 4/3;
    object-fit: cover;
    box-shadow: 0 12px 40px rgba(0,0,0,.1);
}

/* ===== Highlights Grid ===== */
.sol-highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1100px;
    margin: 0 auto;
}
.sol-highlight-card {
    padding: 32px 28px;
    background: var(--sol-white);
    border-radius: var(--sol-radius);
    border: 1px solid var(--sol-gray-100);
    transition: var(--sol-transition);
}
.sol-highlight-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0,0,0,.08);
    border-color: transparent;
}
.sol-hl-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--sol-green-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--sol-green);
    margin-bottom: 20px;
    transition: var(--sol-transition);
}
.sol-highlight-card:hover .sol-hl-icon {
    background: var(--sol-green);
    color: var(--sol-white);
    transform: scale(1.1);
}
.sol-highlight-card h3 {
    font-family: var(--sol-font);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--sol-black);
    margin: 0 0 8px;
}
.sol-highlight-card p {
    font-size: .84rem;
    color: var(--sol-gray-600);
    line-height: 1.6;
    margin: 0;
}

/* ===== Specs Grid ===== */
.sol-specs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}
.sol-spec-item {
    text-align: center;
    padding: 32px 20px;
    background: var(--sol-white);
    border-radius: var(--sol-radius-sm);
    border: 1px solid var(--sol-gray-100);
    transition: var(--sol-transition);
}
.sol-spec-item:hover {
    border-color: var(--sol-green);
    box-shadow: 0 0 0 4px var(--sol-green-glow);
}
.sol-spec-value {
    font-family: var(--sol-font);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--sol-green);
    margin-bottom: 6px;
}
.sol-spec-label {
    font-size: .8rem;
    color: var(--sol-gray-600);
    font-weight: 500;
}

/* ===== Rich Content ===== */
.sol-rich-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: .95rem;
    color: var(--sol-gray-800);
    line-height: 1.75;
}
.sol-rich-content h3 {
    font-family: var(--sol-font);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--sol-black);
    margin: 32px 0 16px;
}
.sol-rich-content h4 {
    font-family: var(--sol-font);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--sol-black);
    margin: 24px 0 12px;
}
.sol-rich-content ul {
    padding-left: 0;
    list-style: none;
}
.sol-rich-content ul li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 10px;
}
.sol-rich-content ul li::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--sol-green);
}

/* ===== Process Timeline ===== */
.sol-process-timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}
.sol-process-timeline::before {
    content: '';
    position: absolute;
    left: 27px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--sol-gray-200);
}
.sol-process-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 24px 0;
    position: relative;
}
.sol-step-number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--sol-white);
    border: 2px solid var(--sol-gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--sol-font);
    font-size: 1rem;
    font-weight: 800;
    color: var(--sol-gray-600);
    position: relative;
    z-index: 2;
    transition: var(--sol-transition);
}
.sol-process-step:hover .sol-step-number {
    border-color: var(--sol-green);
    color: var(--sol-green);
    box-shadow: 0 0 0 8px var(--sol-green-glow);
}
.sol-step-content {
    padding-top: 8px;
}
.sol-step-content h3 {
    font-family: var(--sol-font);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--sol-black);
    margin: 0 0 6px;
}
.sol-step-content p {
    font-size: .85rem;
    color: var(--sol-gray-600);
    line-height: 1.6;
    margin: 0;
}

/* ===== FAQ Accordion ===== */
.sol-faq-list {
    max-width: 760px;
    margin: 0 auto;
}
.sol-faq-item {
    border-bottom: 1px solid var(--sol-gray-100);
}
.sol-faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 0;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: var(--sol-font);
    font-size: .95rem;
    font-weight: 600;
    color: var(--sol-black);
    transition: color .2s;
}
.sol-faq-question:hover { color: var(--sol-green); }
.sol-faq-question i {
    font-size: .75rem;
    color: var(--sol-gray-400);
    transition: transform .3s;
    flex-shrink: 0;
}
.sol-faq-item.open .sol-faq-question i {
    transform: rotate(180deg);
    color: var(--sol-green);
}
.sol-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .4s var(--sol-ease-out), padding .3s;
}
.sol-faq-item.open .sol-faq-answer {
    max-height: 300px;
    padding-bottom: 20px;
}
.sol-faq-answer p {
    font-size: .88rem;
    color: var(--sol-gray-600);
    line-height: 1.7;
    margin: 0;
}

/* ===== Other Solutions ===== */
.sol-other-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}
.sol-other-card {
    display: block;
    text-decoration: none;
    color: inherit;
    padding: 32px;
    background: var(--sol-white);
    border-radius: var(--sol-radius);
    border: 1px solid var(--sol-gray-100);
    transition: var(--sol-transition);
}
.sol-other-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0,0,0,.08);
    border-color: transparent;
}
.sol-other-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--sol-green-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--sol-green);
    margin-bottom: 16px;
    transition: var(--sol-transition);
}
.sol-other-card:hover .sol-other-icon {
    background: var(--sol-green);
    color: var(--sol-white);
}
.sol-other-card h3 {
    font-family: var(--sol-font);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--sol-black);
    margin: 0 0 8px;
}
.sol-other-card p {
    font-size: .82rem;
    color: var(--sol-gray-600);
    line-height: 1.6;
    margin: 0 0 12px;
}
.sol-other-link {
    font-size: .8rem;
    font-weight: 600;
    color: var(--sol-green);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap .3s;
}
.sol-other-card:hover .sol-other-link { gap: 12px; }

/* ===== Detail CTA ===== */
.sol-detail-cta {
    padding: 80px 24px;
    background: var(--sol-black);
    text-align: center;
}
.sol-detail-cta-inner {
    max-width: 640px;
    margin: 0 auto;
}
.sol-detail-cta-inner h2 {
    font-family: var(--sol-font);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--sol-white);
    margin: 0 0 12px;
}
.sol-detail-cta-inner p {
    font-size: .92rem;
    color: var(--sol-gray-400);
    margin: 0 0 32px;
}

/* ================================================
   RESPONSIVE
   ================================================ */
@media (max-width: 991px) {
    .sol-grid { grid-template-columns: 1fr; max-width: 480px; }
    .sol-overview { grid-template-columns: 1fr; gap: 32px; }
    .sol-overview-img { order: -1; }
    .sol-highlights-grid { grid-template-columns: repeat(2, 1fr); }
    .sol-specs-grid { grid-template-columns: repeat(2, 1fr); }
    .sol-other-grid { grid-template-columns: 1fr; max-width: 480px; }
    .sol-detail-hero { min-height: 400px; padding: 100px 20px 60px; }
}

@media (max-width: 575px) {
    .sol-hero { padding: 60px 0 40px; }
    .sol-section { padding: 56px 16px; }
    .sol-highlights-grid { grid-template-columns: 1fr; }
    .sol-specs-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .sol-detail-hero { min-height: 360px; padding: 80px 16px 48px; }
    .sol-detail-icon-wrap { width: 56px; height: 56px; font-size: 1.2rem; }
    .sol-detail-hero-btns { flex-direction: column; align-items: center; }
    .btn-sol-primary, .btn-sol-secondary, .btn-sol-ghost { width: 100%; max-width: 300px; justify-content: center; }
    .sol-process-timeline::before { left: 23px; }
    .sol-step-number { width: 48px; height: 48px; font-size: .9rem; }
    .sol-cta-btns { flex-direction: column; align-items: center; }
    .sol-cta-btns a { width: 100%; max-width: 300px; justify-content: center; }
}