* {
    box-sizing: border-box;
}

:root {
    --ink: #111827;
    --muted: #5b6475;
    --line: #e7eaf0;

    --blue: #1877f2;
    --green: #12b981;
    --orange: #ff8a2a;

    --page-bg:
        radial-gradient(circle at 12% 6%, rgba(24, 119, 242, 0.10), transparent 32rem),
        radial-gradient(circle at 88% 12%, rgba(18, 185, 129, 0.10), transparent 30rem),
        linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);

    --card-bg: rgba(255, 255, 255, 0.88);
    --field-bg: #ffffff;
    --heading: #111827;
}

html {
    scroll-behavior: smooth;
}

html.dark-mode {
    --ink: #f8fafc;
    --muted: #aab4c3;
    --line: rgba(255, 255, 255, 0.12);

    --page-bg:
        radial-gradient(circle at 12% 6%, rgba(24, 119, 242, 0.18), transparent 32rem),
        radial-gradient(circle at 88% 12%, rgba(255, 138, 42, 0.14), transparent 30rem),
        linear-gradient(180deg, #050816 0%, #0b1020 100%);

    --card-bg: rgba(15, 23, 42, 0.72);
    --field-bg: rgba(2, 6, 23, 0.72);
    --heading: #f8fafc;
}

body {
    margin: 0;

    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    background: var(--page-bg);
    color: var(--ink);
}

.page {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

/* THEME TOGGLE */

.topbar {
    display: flex;
    justify-content: flex-end;
    align-items: center;

    padding: 24px 0 0;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;

    border: 1px solid var(--line);
    border-radius: 999px;

    padding: 10px 16px;

    background: var(--card-bg);
    color: var(--ink);

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

    cursor: pointer;

    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);

    transition:
        transform 0.18s ease,
        background 0.18s ease,
        border-color 0.18s ease,
        color 0.18s ease;
}

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

/* HEADER / LOGO */

.header {
    padding: 28px 0 10px;

    display: flex;
    justify-content: center;
    align-items: center;

    text-align: center;
}

.logo {
    width: min(560px, 92%);
    height: auto;

    display: block;
    margin: 0 auto;
}

/* HERO */

.hero {
    padding: 28px 0 44px;

    max-width: 900px;
    margin: 0 auto;

    text-align: center;
}

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

    border: 1px solid rgba(18, 185, 129, 0.28);
    background: rgba(18, 185, 129, 0.08);
    color: #087756;

    border-radius: 999px;

    padding: 9px 14px;

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

    margin-bottom: 24px;
}

html.dark-mode .badge {
    border-color: rgba(18, 185, 129, 0.36);
    background: rgba(18, 185, 129, 0.14);
    color: #86efac;
}

.badge::before {
    content: "";

    width: 9px;
    height: 9px;

    border-radius: 999px;

    background: var(--green);

    box-shadow: 0 0 0 6px rgba(18, 185, 129, 0.14);
}

h1 {
    font-size: clamp(42px, 6vw, 72px);
    line-height: 1;
    letter-spacing: -0.055em;

    margin: 0 0 24px;

    color: var(--heading);
}

.lead {
    color: var(--ink);

    font-size: clamp(19px, 2.1vw, 24px);
    line-height: 1.6;

    max-width: 850px;

    margin: 0 auto 22px;
}

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

    font-size: 17px;
    line-height: 1.75;

    max-width: 850px;

    margin: 0 auto;

    padding-left: 18px;

    border-left: 4px solid var(--green);

    text-align: left;
}

/* CARDS */

.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;

    margin: 10px auto 70px;

    max-width: 1120px;
}

.cards article {
    border: 1px solid var(--line);

    background: var(--card-bg);

    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.07);

    backdrop-filter: blur(8px);

    border-radius: 28px;

    padding: 28px;

    text-align: left;
}

html.dark-mode .cards article {
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.32);
}

.cards h2 {
    margin: 0 0 10px;

    letter-spacing: -0.03em;

    font-size: 23px;

    color: var(--heading);
}

.cards p {
    color: var(--muted);

    line-height: 1.65;

    margin: 0;
}

/* CONTACT */

.contact {
    border-radius: 34px;

    padding: 40px;

    background: var(--card-bg);

    border: 1px solid var(--line);

    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.07);

    backdrop-filter: blur(8px);

    max-width: 860px;

    margin: 0 auto 40px;
}

html.dark-mode .contact {
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.32);
}

.contact-copy {
    text-align: center;

    margin-bottom: 30px;
}

.section-kicker {
    color: var(--green);

    text-transform: uppercase;

    letter-spacing: 0.14em;

    font-size: 13px;

    font-weight: 800;
}

.contact-copy h2 {
    font-size: clamp(32px, 4vw, 48px);

    letter-spacing: -0.05em;

    margin: 12px 0 16px;

    color: var(--heading);
}

.contact-copy p {
    color: var(--muted);

    line-height: 1.7;

    margin: 0;
}

/* FORM */

.form {
    display: grid;
    gap: 18px;
}

label {
    display: grid;
    gap: 8px;

    font-size: 14px;

    color: var(--ink);

    font-weight: 750;
}

input,
textarea {
    width: 100%;

    border: 1px solid var(--line);

    border-radius: 18px;

    padding: 16px 18px;

    font: inherit;

    color: var(--ink);

    background: var(--field-bg);

    outline: none;

    transition:
        border-color 0.18s ease,
        box-shadow 0.18s ease,
        background 0.18s ease,
        color 0.18s ease;
}

input::placeholder,
textarea::placeholder {
    color: #768195;
}

textarea {
    resize: vertical;

    min-height: 180px;
}

input:focus,
textarea:focus {
    border-color: rgba(24, 119, 242, 0.65);

    box-shadow: 0 0 0 5px rgba(24, 119, 242, 0.10);
}

html.dark-mode input:focus,
html.dark-mode textarea:focus {
    border-color: rgba(24, 119, 242, 0.75);

    box-shadow: 0 0 0 5px rgba(24, 119, 242, 0.18);
}

button {
    border: 0;

    border-radius: 18px;

    padding: 18px;

    font: inherit;

    font-weight: 850;

    font-size: 18px;

    cursor: pointer;

    color: #ffffff;

    background:
        linear-gradient(
            135deg,
            var(--blue),
            var(--green) 58%,
            var(--orange)
        );

    box-shadow: 0 14px 30px rgba(18, 185, 129, 0.22);

    transition:
        transform 0.18s ease,
        box-shadow 0.18s ease;
}

button:hover {
    transform: translateY(-1px);

    box-shadow: 0 18px 38px rgba(18, 185, 129, 0.26);
}

/* ALERTS */

.success,
.error {
    border-radius: 18px;

    padding: 14px 16px;

    font-weight: 750;
}

.success {
    background: rgba(18, 185, 129, 0.10);

    color: #087756;

    border: 1px solid rgba(18, 185, 129, 0.22);
}

html.dark-mode .success {
    background: rgba(18, 185, 129, 0.14);

    color: #86efac;

    border-color: rgba(18, 185, 129, 0.28);
}

.error {
    background: rgba(239, 68, 68, 0.08);

    color: #b42318;

    border: 1px solid rgba(239, 68, 68, 0.18);
}

html.dark-mode .error {
    background: rgba(239, 68, 68, 0.14);

    color: #fecaca;

    border-color: rgba(239, 68, 68, 0.30);
}

.hidden {
    position: absolute;

    left: -10000px;

    width: 1px;
    height: 1px;

    opacity: 0;
}

/* FOOTER */

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

    border-top: 1px solid var(--line);

    padding: 24px 0 40px;

    display: flex;
    justify-content: space-between;
    gap: 18px;

    font-size: 14px;
}

/* MOBILE */

@media (max-width: 820px) {
    .logo {
        width: min(440px, 96%);
    }

    .hero {
        padding-top: 20px;
    }

    .cards {
        grid-template-columns: 1fr;

        margin-bottom: 50px;
    }

    .contact {
        padding: 24px;
    }

    .footer {
        flex-direction: column;

        text-align: center;
    }

    h1 {
        line-height: 1.05;
    }
}