:root {
    --hd-navy: #0f172a;
    --hd-navy-soft: #172033;

    --hd-blue: #2563eb;
    --hd-blue-dark: #1d4ed8;
    --hd-blue-light: #dbeafe;

    --hd-cyan: #06b6d4;

    --hd-success: #10b981;
    --hd-success-light: #d1fae5;

    --hd-warning: #f59e0b;
    --hd-warning-light: #fef3c7;

    --hd-danger: #ef4444;
    --hd-danger-light: #fee2e2;

    --hd-white: #ffffff;
    --hd-background: #ffffff;
    --hd-surface: #f8fafc;
    --hd-border: #e2e8f0;

    --hd-text: #0f172a;
    --hd-muted: #64748b;

    --hd-gradient:
        linear-gradient(135deg,
            var(--hd-blue) 0%,
            var(--hd-cyan) 100%);

    --hd-radius-sm: 10px;
    --hd-radius-md: 16px;
    --hd-radius-lg: 24px;
    --hd-radius-pill: 999px;

    --hd-shadow-sm:
        0 1px 2px rgba(15, 23, 42, 0.04),
        0 4px 12px rgba(15, 23, 42, 0.04);

    --hd-shadow-md:
        0 12px 35px rgba(15, 23, 42, 0.08);

    --hd-transition: 200ms ease;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;

    background:
        radial-gradient(circle at 10% 0%,
            rgba(37, 99, 235, 0.08),
            transparent 28rem),
        var(--hd-background);

    color: var(--hd-text);

    font-family:
        "Manrope",
        Arial,
        sans-serif;

    font-size: 16px;
    line-height: 1.6;
}

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

button,
input,
select {
    font: inherit;
}

.core-container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.core-header {
    position: sticky;
    top: 0;
    z-index: 20;

    border-bottom: 1px solid rgba(226, 232, 240, 0.8);

    background: rgba(255, 255, 255, 0.86);

    backdrop-filter: blur(18px);
}

.core-header__content {
    min-height: 76px;

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.core-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.core-brand__symbol {
    width: 44px;
    height: 44px;

    display: grid;
    place-items: center;

    border-radius: 13px;

    background: var(--hd-gradient);
    color: var(--hd-white);

    font-weight: 800;
    letter-spacing: -0.05em;
}

.core-brand__text {
    display: flex;
    flex-direction: column;

    line-height: 1.2;
}

.core-brand__text strong {
    font-size: 15px;
}

.core-brand__text small {
    color: var(--hd-muted);
    font-size: 12px;
}

.core-hero {
    position: relative;
    overflow: hidden;

    min-height: 680px;

    display: flex;
    align-items: center;

    border-bottom: 1px solid var(--hd-border);
}

.core-hero::after {
    content: "";

    position: absolute;
    top: 90px;
    right: -160px;

    width: 560px;
    height: 560px;

    border-radius: 50%;

    background:
        radial-gradient(circle,
            rgba(6, 182, 212, 0.18),
            rgba(37, 99, 235, 0.08) 42%,
            transparent 70%);

    pointer-events: none;
}

.core-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;

    margin-bottom: 20px;

    color: var(--hd-blue);

    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.core-hero h1 {
    max-width: 850px;

    margin: 0;

    font-size: clamp(52px, 8vw, 94px);
    line-height: 0.98;
    letter-spacing: -0.065em;
}

.core-hero__description {
    max-width: 680px;

    margin: 32px 0 0;

    color: var(--hd-muted);

    font-size: 20px;
    line-height: 1.7;
}

.core-hero__actions {
    margin-top: 40px;

    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.core-button {
    min-height: 48px;

    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;

    padding: 0 22px;

    border: 1px solid transparent;
    border-radius: var(--hd-radius-sm);

    cursor: pointer;

    font-size: 14px;
    font-weight: 700;

    transition:
        transform var(--hd-transition),
        border-color var(--hd-transition),
        background-color var(--hd-transition),
        color var(--hd-transition),
        box-shadow var(--hd-transition);
}

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

.core-button:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.25);
    outline-offset: 3px;
}

.core-button--primary {
    background: var(--hd-blue);
    color: var(--hd-white);

    box-shadow:
        0 8px 20px rgba(37, 99, 235, 0.2);
}

.core-button--primary:hover {
    background: var(--hd-blue-dark);
}

.core-button--secondary {
    border-color: var(--hd-border);

    background: var(--hd-white);
    color: var(--hd-text);
}

.core-button--secondary:hover {
    border-color: #cbd5e1;
    box-shadow: var(--hd-shadow-sm);
}

.core-button--outline-light {
    border-color: rgba(255, 255, 255, 0.28);

    background: transparent;
    color: var(--hd-white);
}

.core-button--outline-light:hover {
    background: rgba(255, 255, 255, 0.08);
}

.core-button--ghost-light {
    background: transparent;
    color: #cbd5e1;
}

.core-button--ghost-light:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--hd-white);
}

.core-section {
    padding: 120px 0;
}

.core-section--alternate {
    border-top: 1px solid var(--hd-border);
    border-bottom: 1px solid var(--hd-border);

    background: var(--hd-surface);
}

.core-section--dark {
    background:
        radial-gradient(circle at 85% 20%,
            rgba(6, 182, 212, 0.12),
            transparent 24rem),
        var(--hd-navy);

    color: var(--hd-white);
}

.core-section--dark .core-section__heading p {
    color: #94a3b8;
}

.core-section__heading {
    max-width: 690px;
    margin-bottom: 50px;
}

.core-section__heading--spaced {
    margin-top: 72px;
    margin-bottom: 26px;
}

.core-section__heading h2 {
    margin: 0;

    font-size: clamp(34px, 5vw, 54px);
    line-height: 1.08;
    letter-spacing: -0.045em;
}

.core-section__heading p {
    margin: 20px 0 0;

    color: var(--hd-muted);

    font-size: 18px;
}

.core-grid {
    display: grid;
    gap: 22px;
}

.core-grid--four {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.core-grid--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.core-card {
    min-height: 260px;

    padding: 30px;

    border: 1px solid var(--hd-border);
    border-radius: var(--hd-radius-md);

    background: rgba(255, 255, 255, 0.72);

    transition:
        transform var(--hd-transition),
        border-color var(--hd-transition),
        box-shadow var(--hd-transition);
}

.core-card:hover {
    transform: translateY(-4px);

    border-color: #bfdbfe;

    box-shadow: var(--hd-shadow-md);
}

.core-card__number {
    color: var(--hd-blue);

    font-size: 13px;
    font-weight: 800;
}

.core-card h3 {
    margin: 44px 0 12px;

    font-size: 24px;
    letter-spacing: -0.035em;
}

.core-card p {
    margin: 0;
    color: var(--hd-muted);
}

.core-colors {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
}

.core-color {
    overflow: hidden;

    border: 1px solid var(--hd-border);
    border-radius: var(--hd-radius-md);

    background: var(--hd-white);
}

.core-color__preview {
    height: 150px;
}

.core-color__preview--light {
    border-bottom: 1px solid var(--hd-border);
}

.core-color__content {
    padding: 20px;

    display: flex;
    flex-direction: column;
}

.core-color__content strong {
    font-size: 15px;
}

.core-color__content span {
    margin-top: 3px;

    color: var(--hd-muted);

    font-family: monospace;
    font-size: 13px;
}

.core-color__content small {
    margin-top: 12px;

    color: var(--hd-muted);
    font-size: 12px;
}

.core-type-samples {
    border-top: 1px solid var(--hd-border);
}

.core-type-row {
    padding: 34px 0;

    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 30px;
    align-items: start;

    border-bottom: 1px solid var(--hd-border);
}

.core-type-row>span {
    color: var(--hd-muted);

    font-size: 13px;
    font-weight: 700;
}

.core-type-row strong,
.core-type-row p,
.core-type-row small {
    margin: 0;
}

.core-type-display {
    font-size: clamp(46px, 7vw, 78px);
    line-height: 1;
    letter-spacing: -0.06em;
}

.core-type-h1 {
    font-size: clamp(36px, 5vw, 58px);
    line-height: 1.08;
    letter-spacing: -0.05em;
}

.core-type-h2 {
    font-size: clamp(30px, 4vw, 44px);
    line-height: 1.12;
    letter-spacing: -0.04em;
}

.core-type-h3 {
    font-size: 28px;
    letter-spacing: -0.035em;
}

.core-type-row p {
    max-width: 750px;
    color: var(--hd-muted);
    font-size: 18px;
}

.core-type-row small {
    color: var(--hd-muted);
}

.core-component-group {
    padding: 32px;

    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--hd-radius-md);

    background: rgba(255, 255, 255, 0.04);
}

.core-component-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

.core-badge {
    display: inline-flex;
    align-items: center;

    padding: 7px 11px;

    border-radius: var(--hd-radius-pill);

    font-size: 12px;
    font-weight: 800;
}

.core-badge--success {
    background: var(--hd-success-light);
    color: #047857;
}

.core-badge--info {
    background: var(--hd-blue-light);
    color: var(--hd-blue-dark);
}

.core-badge--warning {
    background: var(--hd-warning-light);
    color: #b45309;
}

.core-badge--danger {
    background: var(--hd-danger-light);
    color: #b91c1c;
}

.core-form-preview {
    max-width: 780px;

    padding: 34px;

    display: grid;
    gap: 24px;

    border: 1px solid var(--hd-border);
    border-radius: var(--hd-radius-lg);

    background: var(--hd-white);

    box-shadow: var(--hd-shadow-sm);
}

.core-form-group {
    display: grid;
    gap: 9px;
}

.core-form-group label {
    font-size: 13px;
    font-weight: 800;
}

.core-form-group input,
.core-form-group select {
    width: 100%;
    min-height: 50px;

    padding: 0 15px;

    border: 1px solid var(--hd-border);
    border-radius: var(--hd-radius-sm);

    background: var(--hd-white);
    color: var(--hd-text);

    outline: none;

    transition:
        border-color var(--hd-transition),
        box-shadow var(--hd-transition);
}

.core-form-group input::placeholder {
    color: #94a3b8;
}

.core-form-group input:focus,
.core-form-group select:focus {
    border-color: var(--hd-blue);

    box-shadow:
        0 0 0 4px rgba(37, 99, 235, 0.1);
}

.core-feature-card {
    padding: 32px;

    border: 1px solid var(--hd-border);
    border-radius: var(--hd-radius-md);

    background: var(--hd-white);

    transition:
        transform var(--hd-transition),
        box-shadow var(--hd-transition);
}

.core-feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--hd-shadow-md);
}

.core-feature-card__icon {
    width: 48px;
    height: 48px;

    display: grid;
    place-items: center;

    border-radius: 14px;

    background: var(--hd-blue-light);
    color: var(--hd-blue);

    font-size: 13px;
    font-weight: 800;
}

.core-feature-card h3 {
    margin: 34px 0 12px;

    font-size: 22px;
    letter-spacing: -0.035em;
}

.core-feature-card p {
    margin: 0;
    color: var(--hd-muted);
}

.core-feature-card a {
    display: inline-block;
    margin-top: 26px;

    color: var(--hd-blue);

    font-size: 14px;
    font-weight: 800;
}

.core-footer {
    padding: 44px 0;

    border-top: 1px solid rgba(255, 255, 255, 0.08);

    background: #080e1a;
    color: var(--hd-white);
}

.core-footer__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.core-footer p {
    margin: 4px 0 0;
    color: #94a3b8;
    font-size: 13px;
}

.core-footer span {
    color: #94a3b8;
    font-size: 13px;
}


.skip-link {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 9999;

    padding: 0.75rem 1rem;

    border-radius: var(--hd-radius-sm);

    background: var(--hd-navy);
    color: var(--hd-white);

    font-size: 14px;
    font-weight: 700;

    transform: translateY(-200%);

    transition: transform var(--hd-transition);
}

.skip-link:focus {
    transform: translateY(0);
}


@media (max-width: 960px) {

    .core-grid--four,
    .core-colors {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .core-grid--three {
        grid-template-columns: 1fr;
    }

    .core-hero {
        min-height: 600px;
    }
}

@media (max-width: 640px) {
    .core-container {
        width: min(100% - 28px, 1180px);
    }

    .core-header__content {
        min-height: 68px;
    }

    .core-header__status {
        display: none;
    }

    .core-hero {
        min-height: auto;
        padding: 110px 0 90px;
    }

    .core-hero h1 {
        font-size: 48px;
    }

    .core-hero__description {
        font-size: 17px;
    }

    .core-hero__actions,
    .core-hero__actions .core-button {
        width: 100%;
    }

    .core-section {
        padding: 82px 0;
    }

    .core-grid--four,
    .core-grid--three,
    .core-colors {
        grid-template-columns: 1fr;
    }

    .core-card {
        min-height: auto;
    }

    .core-type-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .core-type-display {
        font-size: 42px;
    }

    .core-component-group,
    .core-form-preview {
        padding: 22px;
    }

    .core-component-row .core-button {
        width: 100%;
    }

    .core-footer__content {
        align-items: flex-start;
        flex-direction: column;
    }
}