/* Base & tokens */
:root {
    --color-bg: #f5f5f7;
    --color-bg-alt: #ffffff;
    --color-surface: #ffffff;
    --color-primary: #0c4ea2;
    --color-primary-soft: #e3efff;
    --color-accent: #f5a623;
    --color-text: #1c1c1f;
    --color-text-soft: #55525b;
    --color-border-subtle: #d7d7e0;
    --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.08);
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-pill: 999px;
    --font-body: "Georgia", "Times New Roman", serif;
    --font-heading: "Georgia", "Times New Roman", serif;
    --transition-fast: 180ms ease-out;
    --transition-med: 260ms ease-out;
    --grid-max-width: 1120px;
    --nav-height: 72px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Global */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--color-text);
    background: radial-gradient(circle at top, #e0f3ff 0, #f5f5f7 46%, #ffffff 100%);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover,
a:focus-visible {
    text-decoration: underline;
}

/* Skip link */
.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: #000;
    color: #fff;
    padding: 8px 16px;
    z-index: 2000;
}

.skip-link:focus {
    left: 12px;
}

/* Layout helpers */
.section {
    padding: 80px 20px;
}

.section-alt {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.section-header {
    max-width: var(--grid-max-width);
    margin: 0 auto 40px;
    text-align: left;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin: 0 0 10px;
}

.section-header p {
    margin: 0;
    color: var(--color-text-soft);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 44px;
    padding: 10px 20px;
    border-radius: var(--radius-pill);
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color var(--transition-med), color var(--transition-med),
        box-shadow var(--transition-med), transform var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #0c4ea2, #0b70c9);
    color: #ffffff;
    box-shadow: 0 10px 30px rgba(11, 112, 201, 0.35);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 16px 40px rgba(11, 112, 201, 0.4);
}

.btn-secondary {
    background: #ffffff;
    border-color: var(--color-border-subtle);
    color: var(--color-text);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
    background: var(--color-primary-soft);
    transform: translateY(-1px);
}

/* Header / nav */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    backdrop-filter: blur(12px);
    background: linear-gradient(to bottom, rgba(245, 245, 247, 0.92), rgba(245, 245, 247, 0.75));
    transition: background-color var(--transition-med), box-shadow var(--transition-med),
        border-bottom-color var(--transition-med);
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.96);
    border-bottom-color: rgba(215, 215, 224, 0.9);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
}

.nav-inner {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 12px;
    background: conic-gradient(from 160deg, #0c4ea2, #0b70c9, #0cc1e0, #0c4ea2);
    position: relative;
}

.brand-mark::after {
    content: "";
    position: absolute;
    inset: 6px;
    border-radius: 10px;
    background: radial-gradient(circle at 30% 0, #ffffff 0, rgba(255, 255, 255, 0) 45%);
}

.brand-text {
    font-size: 0.85rem;
    line-height: 1.3;
    color: var(--color-text);
}

.brand-sub {
    color: var(--color-text-soft);
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 16px;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-list a {
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.9rem;
    color: var(--color-text-soft);
    text-decoration: none;
}

.nav-list a:hover,
.nav-list a:focus-visible {
    background: rgba(12, 78, 162, 0.08);
    color: var(--color-text);
}

/* Hero */
.hero {
    position: relative;
    min-height: calc(100vh - var(--nav-height));
    isolation: isolate;
    overflow: hidden;
    display: flex;
    align-items: center;
    padding: 60px 20px 80px;
}

.hero-layer {
    position: absolute;
    inset: -40px;
    background-repeat: no-repeat;
    background-size: cover;
    will-change: transform;
    transform: translate3d(0, 0, 0);
    transition: transform 300ms ease-out;
}

.hero-layer-back {
    background-image:
        radial-gradient(circle at 10% 0, rgba(220, 238, 255, 0.9) 0, transparent 60%),
        radial-gradient(circle at 80% 20%, rgba(11, 112, 201, 0.25) 0, transparent 55%);
    z-index: -3;
}

.hero-layer-mid {
    background-image:
        radial-gradient(circle at 15% 80%, rgba(12, 78, 162, 0.35) 0, transparent 65%),
        radial-gradient(circle at 85% 90%, rgba(16, 146, 204, 0.2) 0, transparent 60%);
    mix-blend-mode: multiply;
    z-index: -2;
    opacity: 0.9;
}

.hero-layer-front {
    background-image:
        linear-gradient(135deg, rgba(255, 255, 255, 0.65), rgba(255, 255, 255, 0.2)),
        url("hero-panels.webp");
    background-position: center right;
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.45;
    z-index: -1;
}

.hero-content {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, 1fr);
    gap: 40px;
    align-items: center;
}

.hero-kicker {
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.8rem;
    color: var(--color-text-soft);
    margin: 0 0 10px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.4rem, 4vw, 3.2rem);
    letter-spacing: -0.04em;
    margin: 0 0 16px;
}

.hero-title-line {
    display: block;
}

.hero-subtitle {
    margin: 0 0 20px;
    color: var(--color-text-soft);
    max-width: 32rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 22px;
}

.hero-meta {
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px 20px;
    font-size: 0.88rem;
}

.hero-meta dt {
    font-weight: 600;
    color: var(--color-text-soft);
}

.hero-meta dd {
    margin: 0;
}

/* Services grid */
.grid-services {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(215, 215, 224, 0.7);
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.5fr);
    min-height: 220px;
}

.card-reverse {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.2fr);
}

.card-illustration {
    position: relative;
    overflow: hidden;
}

.card-illustration::before,
.card-illustration::after {
    content: "";
    position: absolute;
    inset: 0;
}

.card-illustration-solar::before {
    background: radial-gradient(circle at 20% 0, #ffeaa7 0, transparent 55%),
        linear-gradient(135deg, #0c4ea2, #0cc1e0);
}

.card-illustration-solar::after {
    mask-image: linear-gradient(135deg, transparent 20%, #000 50%, transparent 80%);
    -webkit-mask-image: linear-gradient(135deg, transparent 20%, #000 50%, transparent 80%);
    background-image: repeating-linear-gradient(115deg,
            rgba(255, 255, 255, 0.9) 0,
            rgba(255, 255, 255, 0.9) 2px,
            transparent 2px,
            transparent 8px);
    opacity: 0.55;
}

.card-illustration-wind::before {
    background: radial-gradient(circle at 10% 10%, #a9e4ff 0, transparent 55%),
        linear-gradient(145deg, #0c4ea2, #16c0b0);
}

.card-illustration-wind::after {
    mask-image: radial-gradient(circle at 50% 50%, transparent 30%, #000 65%, transparent 85%);
    -webkit-mask-image: radial-gradient(circle at 50% 50%, transparent 30%, #000 65%, transparent 85%);
    background-image: linear-gradient(120deg, rgba(255, 255, 255, 0.9), transparent);
    opacity: 0.65;
}

.card-illustration-heat::before {
    background: radial-gradient(circle at 0 10%, #ffd8a8 0, transparent 55%),
        linear-gradient(130deg, #f5a623, #ff7e5f);
}

.card-illustration-heat::after {
    mask-image: linear-gradient(180deg, transparent 20%, #000 60%, transparent 90%);
    -webkit-mask-image: linear-gradient(180deg, transparent 20%, #000 60%, transparent 90%);
    background-image: repeating-linear-gradient(90deg,
            rgba(255, 255, 255, 0.9) 0,
            rgba(255, 255, 255, 0.9) 2px,
            transparent 2px,
            transparent 10px);
    opacity: 0.5;
}

.card-body {
    padding: 20px 22px 22px;
}

.card-body h3 {
    margin: 0 0 10px;
    font-size: 1.1rem;
}

.card-body p {
    margin: 0 0 10px;
    color: var(--color-text-soft);
}

.card-list {
    margin: 0;
    padding-left: 18px;
    font-size: 0.9rem;
    color: var(--color-text);
}

/* 3D Demo */
.demo-layout {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.1fr);
    gap: 32px;
    align-items: center;
}

.demo-3d-wrapper {
    background: rgba(255, 255, 255, 0.82);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(215, 215, 224, 0.8);
    box-shadow: var(--shadow-soft);
    padding: 16px 16px 20px;
}

.demo-3d {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 16px;
    background: linear-gradient(160deg, #87cefa 0, #f5f9ff 40%, #f7f0da 100%);
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(18deg) rotateY(-26deg);
    transition: transform 260ms ease-out;
    overflow: hidden;
}

.demo-sun {
    position: absolute;
    top: 12%;
    left: 12%;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: radial-gradient(circle, #ffeaa7 0, #f5a623 55%, rgba(245, 166, 35, 0.1) 100%);
    box-shadow: 0 0 35px rgba(245, 166, 35, 0.8);
}

.demo-panel-row {
    position: absolute;
    left: 12%;
    right: 12%;
    height: 22%;
    display: flex;
    justify-content: space-between;
}

.demo-panel-row:nth-of-type(2) {
    top: 45%;
}

.demo-panel-row:nth-of-type(3) {
    top: 63%;
}

.demo-panel {
    flex: 1 1 0;
    margin: 0 4px;
    border-radius: 6px;
    background: repeating-linear-gradient(135deg,
            rgba(255, 255, 255, 0.16) 0,
            rgba(255, 255, 255, 0.16) 2px,
            transparent 2px,
            transparent 6px),
        linear-gradient(145deg, #0c4ea2, #0cc1e0);
    box-shadow: 0 10px 18px rgba(0, 0, 0, 0.25);
}

.demo-ground {
    position: absolute;
    inset-inline: 0;
    bottom: -6%;
    height: 40%;
    background: radial-gradient(circle at 20% 0, rgba(255, 255, 255, 0.8) 0, transparent 45%),
        linear-gradient(180deg, #c3e38e 0, #86b752 40%, #4c7a2b 100%);
    transform: translateZ(-20px);
}

.demo-caption {
    margin: 10px 0 0;
    font-size: 0.9rem;
    color: var(--color-text-soft);
}

.demo-info h3 {
    margin-top: 0;
}

.demo-info p {
    color: var(--color-text-soft);
}

.demo-list {
    margin: 12px 0 0;
    padding-left: 18px;
}

/* About / company details */
.about-grid {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
    gap: 30px;
}

.about-block {
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    border: 1px solid rgba(215, 215, 224, 0.8);
    box-shadow: var(--shadow-soft);
}

.about-block h3 {
    margin-top: 0;
}

.company-details {
    margin: 10px 0 0;
}

.company-details div {
    margin-bottom: 8px;
}

.company-details dt {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--color-text-soft);
}

.company-details dd {
    margin: 0;
    font-size: 0.92rem;
}

/* Testimonials */
.grid-testimonials {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.testimonial {
    padding: 22px 24px;
}

.testimonial-quote {
    margin: 0 0 12px;
    color: var(--color-text-soft);
    font-style: italic;
}

.testimonial-name {
    margin: 0;
    font-weight: 600;
    font-size: 0.9rem;
}

/* FAQ */
.faq {
    max-width: var(--grid-max-width);
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border-subtle);
}

.faq-item:last-of-type {
    border-bottom: none;
}

.faq-trigger {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 16px 0;
    font: inherit;
    color: var(--color-text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-trigger:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.faq-icon {
    width: 22px;
    height: 22px;
    border-radius: 999px;
    border: 1px solid var(--color-border-subtle);
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: "";
    position: absolute;
    inset: 50%;
    width: 10px;
    height: 2px;
    background: var(--color-text-soft);
    transform: translate(-50%, -50%);
}

.faq-icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
    transition: opacity var(--transition-fast);
}

.faq-trigger[aria-expanded="true"] .faq-icon::after {
    opacity: 0;
}

.faq-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-med);
}

.faq-panel p {
    margin: 0 0 16px;
    color: var(--color-text-soft);
}

/* Contact */
.contact-section {
    background: linear-gradient(135deg, rgba(12, 78, 162, 0.05), rgba(12, 193, 224, 0.08));
}

.contact-grid {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
    gap: 26px;
}

.contact-block {
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: 22px 24px 26px;
    border: 1px solid rgba(215, 215, 224, 0.85);
    box-shadow: var(--shadow-soft);
}

.contact-form {
    display: grid;
    gap: 12px;
}

.form-field label {
    display: block;
    margin-bottom: 4px;
    font-size: 0.9rem;
}

.form-field input,
.form-field textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--color-border-subtle);
    font: inherit;
    color: var(--color-text);
}

.form-field input:focus-visible,
.form-field textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
    border-color: var(--color-primary);
}

.form-note {
    margin: 6px 0 0;
    font-size: 0.82rem;
    color: var(--color-text-soft);
}

/* Footer */
.site-footer {
    padding: 18px 20px 20px;
    background: #0c1524;
    color: #f7f7fb;
    font-size: 0.85rem;
}

.footer-inner {
    max-width: var(--grid-max-width);
    margin: 0 auto;
}

.site-footer p {
    margin: 2px 0;
}

/* Scroll reveal base */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 260ms ease-out, transform 260ms ease-out;
}

.reveal-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive breakpoints */
@media (max-width: 920px) {
    .hero-content {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero-layer-front {
        background-position: bottom right;
        opacity: 0.35;
    }

    .card,
    .card-reverse {
        grid-template-columns: minmax(0, 1fr);
    }

    .demo-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 640px) {
    .nav-inner {
        padding-inline: 14px;
    }

    .nav-list {
        gap: 8px;
    }

    .nav-list li:nth-last-child(1) .btn-primary {
        padding-inline: 14px;
    }

    .section {
        padding: 60px 16px;
    }

    .hero {
        padding-inline: 16px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .card {
        border-radius: 16px;
    }

    .demo-3d-wrapper,
    .about-block,
    .contact-block {
        border-radius: 16px;
    }
}