:root {
    --bg: #f7f8fb;
    --dark: #111827;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --border: #e5e7eb;
    --white: #ffffff;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--dark);
}

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

button,
input {
    font: inherit;
}

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 20;
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
}

.brand-mark {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: var(--primary);
    color: var(--white);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 18px;
}

.nav-links form {
    margin: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 10px;
    padding: 10px 16px;
    cursor: pointer;
    font-weight: 700;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--dark);
    border: 1px solid var(--border);
}

.btn-ghost {
    background: transparent;
    color: var(--dark);
}

.btn-large {
    padding: 14px 22px;
}

.btn-full {
    width: 100%;
}

.hero {
    padding: 80px 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
}

.eyebrow {
    color: var(--primary);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 13px;
}

.hero h1,
.section h1 {
    font-size: clamp(36px, 6vw, 64px);
    line-height: 1.02;
    margin: 12px 0 20px;
}

.hero-text {
    color: var(--muted);
    font-size: 18px;
    line-height: 1.7;
    max-width: 620px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.hero-card,
.info-card,
.auth-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

.hero-card {
    padding: 32px;
}

.feature-list {
    padding-left: 20px;
    color: var(--muted);
    line-height: 1.9;
}

.section {
    padding: 72px 0;
}

.section-heading {
    max-width: 680px;
    margin-bottom: 28px;
}

.section-heading h2 {
    font-size: 40px;
    margin: 8px 0;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.info-card {
    padding: 24px;
}

.info-card h3 {
    margin-top: 0;
}

.info-card p {
    color: var(--muted);
    line-height: 1.6;
}

.auth-section {
    min-height: calc(100vh - 145px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 16px;
}

.auth-card {
    width: min(460px, 100%);
    padding: 32px;
}

.auth-card h1 {
    margin-top: 0;
    margin-bottom: 8px;
}

.auth-card p {
    color: var(--muted);
}

.form {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.form-group {
    display: grid;
    gap: 8px;
}

.form-group label {
    font-weight: 700;
}

.form-group input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    background: var(--white);
}

.form-group small {
    color: var(--muted);
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
}

.alert {
    padding: 14px;
    border-radius: 12px;
    margin-top: 18px;
}

.alert-error {
    background: var(--danger-bg);
    color: var(--danger-text);
}

.auth-switch {
    margin-top: 22px;
    text-align: center;
}

.auth-switch a {
    color: var(--primary);
    font-weight: 700;
}

.dashboard-header {
    margin-bottom: 30px;
}

.site-footer {
    background: var(--white);
    border-top: 1px solid var(--border);
}

.footer-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 900px) {
    .hero-grid,
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .header-inner,
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        padding: 18px 0;
    }

    .nav-links {
        flex-wrap: wrap;
    }
}