:root {
    color-scheme: light;
    --bg: #f5f7f6;
    --panel: #ffffff;
    --panel-strong: #f7fbfa;
    --ink: #17211d;
    --muted: #687069;
    --line: #d8dfdd;
    --accent: #0f766e;
    --accent-dark: #0b5f59;
    --danger: #b42318;
    --shadow: 0 20px 60px rgba(23, 33, 29, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        linear-gradient(135deg, rgba(15, 118, 110, 0.12), transparent 32rem),
        var(--bg);
    color: var(--ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.page-shell {
    width: min(1120px, calc(100% - 32px));
    min-height: 100vh;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 24px;
    align-items: center;
    padding: 48px 0;
}

.tool-panel,
.details-panel {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.tool-panel {
    padding: clamp(24px, 5vw, 52px);
}

.details-panel {
    padding: 28px;
    background: var(--panel-strong);
}

.intro {
    max-width: 680px;
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--accent-dark);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

h1,
h2,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 14px;
    font-size: 4rem;
    line-height: 1.02;
    letter-spacing: 0;
}

h2 {
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.lede {
    max-width: 580px;
    margin-bottom: 32px;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

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

.field {
    display: grid;
    gap: 8px;
}

label {
    font-weight: 750;
}

input[type="url"] {
    width: 100%;
    min-height: 54px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    color: var(--ink);
    font: inherit;
    padding: 0 16px;
}

input[type="url"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.14);
    outline: none;
}

.check-row {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    color: var(--ink);
    line-height: 1.45;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--accent);
    flex: 0 0 auto;
}

.primary-button {
    width: fit-content;
    min-width: 170px;
    min-height: 48px;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: #ffffff;
    cursor: pointer;
    font: inherit;
    font-weight: 800;
    padding: 0 22px;
}

.primary-button:hover,
.primary-button:focus-visible {
    background: var(--accent-dark);
}

.primary-button:focus-visible {
    outline: 4px solid rgba(15, 118, 110, 0.2);
    outline-offset: 2px;
}

.field-error,
.message {
    margin: 0;
    color: var(--danger);
    font-size: 0.92rem;
    line-height: 1.45;
}

.field-error.compact {
    margin-top: -8px;
}

.message-list {
    display: grid;
    gap: 8px;
    margin-bottom: 22px;
}

.message {
    border: 1px solid rgba(180, 35, 24, 0.22);
    border-radius: 8px;
    background: rgba(180, 35, 24, 0.08);
    padding: 12px 14px;
}

.details-panel ul {
    display: grid;
    gap: 12px;
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
    line-height: 1.55;
}

@media (max-width: 860px) {
    .page-shell {
        min-height: auto;
        grid-template-columns: 1fr;
        align-items: start;
        padding: 24px 0;
    }

    h1 {
        font-size: 2.3rem;
    }

    .primary-button {
        width: 100%;
    }
}