:root {
    --primary: #18a7a1;
    --primary-dark: #115e59;
    --navy: #163b5c;
    --text: #43536a;
    --muted: #718096;
    --bg: #f5f9fc;
    --white: #ffffff;
    --border: #e4edf2;
    --radius: 16px;
    --shadow: 0 12px 35px rgba(0, 70, 80, 0.09);
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(circle at 10% 20%, #e2f4f1 0, transparent 28%),
        radial-gradient(circle at 90% 80%, #e8effb 0, transparent 30%),
        var(--bg);
}

/* Header */
.header {
    width: 100%;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--border);
}

.navbar {
    min-height: 82px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--navy);
    font-family: "Manrope", sans-serif;
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.8px;
}

.brand img {
    height: 48px;
    width: auto;
}

.brand span span {
    color: var(--primary);
}

.header-link {
    color: var(--navy);
    font-size: 14px;
    font-weight: 700;
    transition: color 0.2s ease;
}

.header-link:hover {
    color: var(--primary);
}

/* Main 404 section */
main {
    flex: 1;
    display: grid;
    place-items: center;
    padding: 70px 0 80px;
}

.error-layout {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    align-items: center;
    gap: 60px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 9px 15px;
    color: var(--primary-dark);
    background: #e1f4ef;
    border: 1px solid #c8e9e0;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.1px;
    text-transform: uppercase;
}

h1 {
    margin: 24px 0 16px;
    color: var(--navy);
    font-family: "Manrope", sans-serif;
    font-size: clamp(36px, 5vw, 58px);
    line-height: 1.12;
    letter-spacing: -2.4px;
}

h1 span {
    color: var(--primary);
}

.description {
    max-width: 480px;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.9;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 13px;
    margin-top: 30px;
}

.btn {
    min-height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 0 24px;
    border: 1px solid transparent;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    transition: transform 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    color: var(--white);
    background: var(--primary);
    box-shadow: 0 9px 20px #0f766e26;
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 12px 24px #0f766e30;
}

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

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

.btn svg {
    width: 18px;
    height: 18px;
}

.help-text {
    margin-top: 25px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.8;
}

.help-text a {
    color: var(--primary);
    font-weight: 700;
}

/* Illustration */
.illustration {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 390px;
}

.art-circle {
    position: absolute;
    width: min(100%, 380px);
    aspect-ratio: 1;
    background: linear-gradient(145deg, #e1f4ef, #e8effb);
    border: 1px solid #ffffff;
    border-radius: 50%;
}

.art-circle::before,
.art-circle::after {
    content: "";
    position: absolute;
    border: 1px solid #cde6e4;
    border-radius: 50%;
}

.art-circle::before {
    inset: 22px;
}

.art-circle::after {
    inset: 44px;
}

.art-card {
    position: relative;
    z-index: 1;
    width: min(330px, 90%);
    padding: 28px 25px;
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid #ffffff;
    border-radius: 25px;
    box-shadow: 0 24px 65px #203b5716;
    text-align: center;
}

.art-icon {
    width: 92px;
    height: 92px;
    display: grid;
    place-items: center;
    margin: 0 auto 20px;
    color: var(--primary);
    background: #e7f6f1;
    border-radius: 25px;
}

.art-icon svg {
    width: 55px;
    height: 55px;
}

.error-number {
    color: var(--primary);
    font-family: "Manrope", sans-serif;
    font-size: 68px;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -4px;
}

.art-card h2 {
    margin-top: 8px;
    color: var(--navy);
    font-family: "Manrope", sans-serif;
    font-size: 19px;
}

.art-card p {
    margin-top: 8px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.7;
}

.float-icon {
    position: absolute;
    z-index: 2;
    width: 55px;
    height: 55px;
    display: grid;
    place-items: center;
    color: var(--primary);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 17px;
    box-shadow: 0 12px 25px #203b5712;
}

.float-icon svg {
    width: 25px;
    height: 25px;
}

.float-one {
    top: 48px;
    right: 7%;
}

.float-two {
    bottom: 45px;
    left: 4%;
    color: #4865a8;
}

/* Helpful links */
.link-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.quick-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: border-color 0.2s ease,
        transform 0.2s ease;
}

.quick-card:hover {
    border-color: #9bd4c7;
    transform: translateY(-3px);
}

.quick-icon {
    flex-shrink: 0;
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    color: var(--primary);
    background: #e5f5f0;
    border-radius: 13px;
}

.quick-icon svg {
    width: 22px;
    height: 22px;
}

.quick-card h3 {
    color: var(--navy);
    font-size: 14px;
    font-weight: 700;
}

.quick-card p {
    margin-top: 5px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 850px) {
    .error-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .error-copy {
        text-align: center;
    }

    .description {
        margin: 0 auto;
    }

    .actions {
        justify-content: center;
    }

    .illustration {
        min-height: 350px;
    }

    .art-circle {
        width: 330px;
    }

    .link-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .quick-card {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .navbar {
        min-height: 72px;
    }

    .brand {
        gap: 9px;
        font-size: 19px;
    }

    .brand-icon {
        width: 39px;
        height: 39px;
        border-radius: 12px;
    }

    .header-link {
        font-size: 12px;
    }

    main {
        padding: 48px 0 40px;
    }

    h1 {
        font-size: 39px;
        letter-spacing: -1.7px;
    }

    .description {
        font-size: 14px;
    }

    .actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .illustration {
        min-height: 315px;
    }

    .art-circle {
        width: 285px;
    }

    .art-card {
        width: 270px;
        padding: 23px 17px;
    }

    .art-icon {
        width: 72px;
        height: 72px;
        border-radius: 20px;
    }

    .art-icon svg {
        width: 44px;
        height: 44px;
    }

    .error-number {
        font-size: 58px;
    }

    .float-icon {
        width: 44px;
        height: 44px;
        border-radius: 13px;
    }

    .float-one {
        right: 0;
        top: 35px;
    }

    .float-two {
        left: 0;
        bottom: 30px;
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}