:root {
        --bg: #f7f9fc;
        --surface: #ffffff;
        --primary: #1490d3;
        --primary-dark: #0f6fa3;
        --secondary: #f09a00;
        --text: #1d2733;
        --muted: #5e6b78;
        --border: #d9e2ec;
        --accent: #eaf5fc;
        --shadow: 0 10px 30px rgba(16, 45, 74, 0.08);
        --max-width: 1180px;
        --radius: 10px;
    }

    * {
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        margin: 0;
        font-family: Inter, Arial, Helvetica, sans-serif;
        color: var(--text);
        background: var(--bg);
        line-height: 1.6;
    }

    a {
        color: inherit;
        text-decoration: none;
    }

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

    .container {
        width: min(var(--max-width), calc(100% - 2rem));
        margin: 0 auto;
    }

    .topbar {
        background: rgba(255, 255, 255, 0.96);
        border-bottom: 1px solid var(--border);
        position: sticky;
        top: 0;
        z-index: 100;
        backdrop-filter: blur(8px);
        box-shadow: 0 4px 18px rgba(15, 76, 129, 0.06);
    }

    .topbar-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.8rem 0;
        gap: 1.5rem;
        min-height: 92px;
    }

    .brand {
        display: flex;
        align-items: center;
        gap: 0.85rem;
        font-weight: 800;
        letter-spacing: 0.04em;
        flex: 0 0 auto;
    }

    .brand-logo {
        height: 72px;
        width: auto;
        object-fit: contain;
        display: block;
    }


    nav {
        display: flex;
        gap: 1.1rem;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-end;
        margin-left: auto;
    }

    nav a {
        color: var(--muted);
        font-weight: 600;
        font-size: 0.95rem;
    }

    nav a:hover {
        color: var(--primary);
    }

    .language-switcher {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        padding: 0.25rem;
        border: 1px solid var(--border);
        border-radius: 999px;
        background: white;
    }

    .language-switcher a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-width: 2.4rem;
        padding: 0.35rem 0.55rem;
        border-radius: 999px;
        font-size: 0.82rem;
        font-weight: 800;
        color: var(--muted);
    }

    .language-switcher a:hover,
    .language-switcher a[aria-current="true"] {
        background: var(--primary);
        color: white;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        padding: 0.5rem 0.5rem;
        border-radius: 999px;
        font-weight: 700;
        border: 1px solid transparent;
        transition: 0.2s ease;
        cursor: pointer;
    }

    .btn-primary {
        background: var(--primary);
        color: white;
        box-shadow: var(--shadow);
    }

    .btn-primary:hover {
        background: var(--primary-dark);
    }

    .btn-secondary {
        background: white;
        color: var(--primary);
        border-color: var(--border);
    }

    .hero {
        padding: 4.5rem 0 3rem;
        background:
            radial-gradient(circle at top right, rgba(240, 154, 0, 0.16), transparent 25%),
            radial-gradient(circle at top left, rgba(15, 76, 129, 0.12), transparent 28%);
    }

    .hero-grid {
        display: grid;
        grid-template-columns: 1.2fr 0.8fr;
        gap: 2rem;
        align-items: center;
    }

    .eyebrow {
        display: inline-block;
        background: var(--accent);
        color: var(--primary);
        padding: 0.45rem 0.8rem;
        border-radius: 999px;
        font-size: 0.85rem;
        font-weight: 700;
        margin-bottom: 1rem;
    }

    h1,
    h2,
    h3 {
        margin: 0 0 1rem;
        line-height: 1.15;
    }

    h1 {
        /* font-size: clamp(2.2rem, 5vw, 4rem); */
        letter-spacing: -0.03em;
    }

    h2 {
        font-size: clamp(1.7rem, 3vw, 2.5rem);
    }

    h3 {
        font-size: 1.2rem;
    }

    .lead {
        font-size: 1.08rem;
        color: var(--muted);
        max-width: 62ch;
    }

    .hero-actions {
        display: flex;
        gap: 1rem;
        flex-wrap: wrap;
        margin-top: 1.5rem;
    }

    .hero-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 1.4rem;
        box-shadow: var(--shadow);
    }

    .temperature-list {
        display: grid;
        gap: 0.8rem;
        margin-top: 1rem;
    }

    .temp-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.9rem 1rem;
        border-radius: 10px;
        background: var(--bg);
        border: 1px solid var(--border);
        font-weight: 700;
    }

    section {
        padding: 3rem 0;
    }

    .section-head {
        display: flex;
        justify-content: space-between;
        align-items: end;
        gap: 1rem;
        margin-bottom: 2rem;
    }

    .section-head p {
        margin: 0;
        color: var(--muted);
        max-width: 58ch;
    }

    .grid-3 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1.2rem;
    }

    .grid-2 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1.2rem;
    }

    .card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 1.4rem;
        box-shadow: var(--shadow);
        height: 100%;
    }

    .card .tag {
        display: inline-block;
        font-size: 0.82rem;
        font-weight: 700;
        color: #b56d00;
        background: #fff1d6;
        padding: 0.35rem 0.65rem;
        border-radius: 999px;
        margin-bottom: 0.8rem;
    }

    .muted {
        color: var(--muted);
    }

    .audience-list,
    .feature-list,
    .product-list {
        list-style: none;
        padding: 0;
        margin: 1rem 0 0;
        display: grid;
        gap: 0.7rem;
    }

    .audience-list li,
    .feature-list li,
    .product-list li {
        padding-left: 1.2rem;
        position: relative;
        color: var(--text);
    }

    .audience-list li::before,
    .feature-list li::before,
    .product-list li::before {
        content: "•";
        position: absolute;
        left: 0;
        color: var(--secondary);
        font-weight: 900;
    }

    .highlight {
        background: linear-gradient(180deg, rgba(255, 255, 255, 0) 40%, rgba(255, 241, 214, 1) 40%);
        font-weight: 800;
    }

    .about-banner {
        background: linear-gradient(135deg, var(--primary), var(--primary-dark));
        color: white;
        border-radius: var(--radius);
        /* border-radius: calc(var(--radius) + 4px); */
        padding: 2rem;
        box-shadow: var(--shadow);
    }

    .about-banner p {
        color: rgba(255, 255, 255, 0.9);
        margin: 0;
        max-width: 78ch;
    }

    .contact-wrap {
        display: grid;
        grid-template-columns: 0.9fr 1.1fr;
        gap: 1.4rem;
        align-items: start;
    }

    .contact-card,
    .form-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 1.5rem;
        height: 100%;
    }

    .contact-card .info {
        display: grid;
        gap: 1rem;
        margin-top: 1rem;
    }

    .info-block {
        padding: 1rem;
        background: var(--bg);
        border: 1px solid var(--border);
        border-radius: 10px;
    }

    form {
        display: grid;
        gap: 1rem;
    }

    .form-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    label {
        display: grid;
        gap: 0.45rem;
        font-weight: 700;
        font-size: 0.95rem;
    }

    input,
    select,
    textarea {
        width: 100%;
        border: 1px solid var(--border);
        background: white;
        border-radius: 10px;
        padding: 0.50rem 0.50rem;
        font: inherit;
        color: var(--text);
    }

    textarea {
        min-height: 150px;
        resize: vertical;
    }

    input:focus,
    select:focus,
    textarea:focus {
        outline: 3px solid rgba(15, 76, 129, 0.14);
        border-color: var(--primary);
    }

    .consent {
        display: flex;
        align-items: flex-start;
        gap: 0.7rem;
        font-size: 0.92rem;
        color: var(--muted);
    }

    .consent input {
        width: auto;
        margin-top: 0.2rem;
    }

    .note {
        font-size: 0.9rem;
        color: var(--muted);
        margin: 0;
    }

    footer {
        padding: 2rem 0 3rem;
        color: var(--muted);
        font-size: 0.95rem;
    }

    .footer-card {
        background: white;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 1.25rem 1.5rem;
    }

    @media (max-width: 980px) {

        .hero-grid,
        .contact-wrap,
        .grid-3,
        .grid-2 {
            grid-template-columns: 1fr;
        }

        .section-head {
            align-items: start;
            flex-direction: column;
        }
    }

    @media (max-width: 680px) {
        .brand-logo {
            height: 54px;
        }

        .topbar-inner {
            min-height: auto;
            padding: 0.9rem 0;
        }

        nav {
            width: 100%;
            justify-content: flex-start;
            gap: 0.75rem 1rem;
        }


        .topbar-inner {
            flex-direction: column;
            align-items: flex-start;
        }

        nav {
            width: 100%;
        }

        .form-grid {
            grid-template-columns: 1fr;
        }

        .hero {
            padding-top: 3rem;
        }
    }

    #message.success {
        margin-bottom: 1rem;
        color: #166534;
        background: #dcfce7;
        padding: 0.75rem;
        border-radius: 0.5rem;
    }

    #message.error {
        margin-bottom: 1rem;
        color: #991b1b;
        background: #fee2e2;
        padding: 0.75rem;
        border-radius: 0.5rem;
    }

    button:disabled {
        opacity: 0.5;
        cursor: not-allowed;
    }