:root {
    --t-fast: 220ms;
    --t-med: 320ms;
    --ease-ui: cubic-bezier(.2, .8, .2, 1);
    --ff-heading: "Space Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --ff-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --ff-mono: "JetBrains Mono", "Fira Code", monospace;
    --nav-h: 120px;
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --shadow-card: 0 1px 3px rgba(11, 18, 32, 0.06), 0 1px 2px rgba(11, 18, 32, 0.04);
    --shadow-soft: 0 4px 12px rgba(11, 18, 32, 0.08);
    --transition-speed: 0.3s;
}

html[data-theme="light"] {
    --page-bg: #f7f8fa;
    --section-bg: #eef2f6;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --border: #d7dee8;
    --heading: #0b1220;
    --text: #243041;
    --muted: #5b677a;
    --accent: #d4af37;
    --accent-hover: #b68b1e;
    --accent-strong: #8f6c14;
    --accent-soft: rgba(212, 175, 55, 0.12);
}

html[data-theme="dark"] {
    --page-bg: #0b0f14;
    --section-bg: #101826;
    --surface: #141c27;
    --surface-strong: #182231;
    --border: #263244;
    --heading: #f7faff;
    --text: #e8edf4;
    --muted: #a7b2c3;
    --accent: #d4af37;
    --accent-hover: #b68b1e;
    --accent-strong: #f1d27d;
    --accent-soft: rgba(212, 175, 55, 0.12);
}

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

html {
    scroll-behavior: smooth;
    background: var(--page-bg);
    color: var(--text);
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--ff-body);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(212, 175, 55, 0.08), transparent 24%),
        radial-gradient(circle at top right, rgba(212, 175, 55, 0.06), transparent 28%),
        linear-gradient(180deg, var(--page-bg), var(--section-bg));
}

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

button,
input,
select,
textarea {
    font: inherit;
}

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

code,
pre {
    font-family: var(--ff-mono);
}

.navbar {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 1.25rem;
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--surface) 96%, transparent);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    z-index: 1000;
}

.navbar__brand {
    display: inline-flex;
    align-items: center;
    gap: 0.9rem;
    min-width: 0;
}

.navbar__brand-mark {
    display: grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent-strong) 72%, white));
    color: #031417;
    font-weight: 800;
    letter-spacing: 0.06em;
}

.navbar__brand-copy {
    display: grid;
    gap: 0.1rem;
}

.navbar__brand-copy strong {
    font-family: var(--ff-heading);
    font-size: 0.98rem;
    letter-spacing: 0.01em;
    color: var(--heading);
}

.navbar__brand-copy span {
    font-size: 0.78rem;
    color: var(--muted);
}

.navbar__panel {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.navbar__links {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.navbar__link {
    border: 0;
    background: transparent;
    padding: 0.75rem 0.95rem;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.94rem;
    font-weight: 600;
    cursor: pointer;
    transition: color var(--transition-speed), background-color var(--transition-speed), transform var(--transition-speed);
}

.navbar__link--button {
    appearance: none;
}

.navbar__link:hover,
.navbar__link[aria-current="page"] {
    color: var(--heading);
    background: var(--accent-soft);
}

.navbar__link:hover {
    transform: translateY(-1px);
}

.navbar__hamburger {
    display: none;
    width: 2.8rem;
    height: 2.8rem;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    color: var(--heading);
}

.navbar__hamburger span {
    display: block;
    width: 1.1rem;
    height: 2px;
    margin: 0.18rem auto;
    border-radius: 999px;
    background: currentColor;
    transition: transform var(--transition-speed), opacity var(--transition-speed);
}

.navbar__hamburger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(0.36rem) rotate(45deg);
}

.navbar__hamburger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.navbar__hamburger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-0.36rem) rotate(-45deg);
}

.theme-button {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.72rem 0.95rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface) 86%, transparent);
    color: var(--heading);
    cursor: pointer;
    transition: transform var(--transition-speed), border-color var(--transition-speed), background-color var(--transition-speed);
}

.theme-button:hover {
    transform: translateY(-1px);
    border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.theme-button__icon {
    display: inline-grid;
    place-items: center;
    width: 1.45rem;
    height: 1.45rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-hover);
    font-size: 0.88rem;
}

.theme-button__label {
    font-size: 0.9rem;
    font-weight: 600;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 3.2rem;
    padding: 0.9rem 1.4rem;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 700;
    cursor: pointer;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed), background-color var(--transition-speed);
}

.btn:hover {
    transform: translateY(-1px);
}

.btn--primary {
    background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent-strong) 75%, white));
    color: #021418;
    box-shadow: 0 12px 28px rgba(15, 118, 110, 0.22);
}

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

.btn--outline {
    border-color: var(--border);
    background: color-mix(in srgb, var(--surface) 84%, transparent);
    color: var(--heading);
}

.site-footer {
    padding: 1.5rem 1.25rem 2.5rem;
    color: var(--muted);
    text-align: center;
}

.site-footer p {
    width: min(860px, 100%);
    margin: 0 auto;
    line-height: 1.6;
}

@media (max-width: 860px) {
    .navbar {
        padding: 0 1rem;
    }

    .navbar__hamburger {
        display: inline-block;
    }

    .navbar__panel {
        position: absolute;
        top: calc(100% + 0.8rem);
        left: 1rem;
        right: 1rem;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        border: 1px solid var(--border);
        border-radius: 24px;
        background: color-mix(in srgb, var(--surface) 96%, transparent);
        box-shadow: var(--shadow-card);
    }

    .navbar__panel.is-open {
        display: flex;
    }

    .navbar__links {
        flex-direction: column;
        align-items: stretch;
    }

    .navbar__link {
        text-align: center;
    }

    .theme-button {
        justify-content: center;
        width: 100%;
    }
}