:root {
    --background: #f4f7fb;
    --surface: #ffffff;
    --text: #172033;
    --muted: #64748b;
    --border: #dbe3ee;
    --primary: #1d4ed8;
    --primary-hover: #1e40af;
    --danger-background: #fef2f2;
    --danger-border: #fecaca;
    --danger-text: #991b1b;
    --success-background: #f0fdf4;
    --success-border: #bbf7d0;
    --success-text: #166534;
    --radius: 10px;
    --shadow: 0 15px 40px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    font-family:
        Arial,
        Helvetica,
        sans-serif;
    line-height: 1.5;
    color: var(--text);
    background: var(--background);
}

body {
    min-height: 100vh;
    margin: 0;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

button,
input {
    font: inherit;
}

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

.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.navigation {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

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

.brand {
    color: var(--text);
    font-size: 19px;
    font-weight: 700;
}

.page-content {
    padding-block: 56px;
}

.hero {
    max-width: 720px;
    padding: 56px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.hero h1,
.auth-card h1,
.dashboard-card h1 {
    margin-top: 0;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero h1 {
    font-size: clamp(32px, 6vw, 52px);
}

.hero p {
    color: var(--muted);
    font-size: 18px;
}

.eyebrow {
    margin-bottom: 10px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 30px;
}

.button {
    display: inline-flex;
    min-height: 44px;
    padding: 10px 18px;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    background: var(--primary);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 700;
    text-decoration: none;
}

.button:hover {
    color: #ffffff;
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    text-decoration: none;
}

.button-secondary {
    color: var(--text);
    background: var(--surface);
    border-color: var(--border);
}

.button-secondary:hover {
    color: var(--text);
    background: #f8fafc;
    border-color: #cbd5e1;
}

.button-block {
    width: 100%;
}

.auth-page {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 32px 16px;
}

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

.auth-container>.brand {
    display: block;
    margin-bottom: 20px;
    text-align: center;
}

.auth-card,
.dashboard-card {
    padding: 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.auth-description {
    margin-top: -4px;
    margin-bottom: 26px;
    color: var(--muted);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-weight: 700;
}

.form-group input {
    width: 100%;
    min-height: 46px;
    padding: 10px 12px;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.12);
}

.form-group small {
    display: block;
    margin-top: 7px;
    color: var(--muted);
}

.checkbox-row {
    display: flex;
    margin-bottom: 20px;
    align-items: center;
    gap: 9px;
}

.checkbox-row input {
    width: 17px;
    height: 17px;
}

.auth-links {
    display: flex;
    margin-top: 22px;
    flex-direction: column;
    gap: 8px;
    text-align: center;
}

.alert {
    padding: 13px 15px;
    margin-bottom: 22px;
    border: 1px solid;
    border-radius: var(--radius);
}

.alert ul {
    margin-bottom: 0;
    padding-left: 20px;
}

.alert-success {
    color: var(--success-text);
    background: var(--success-background);
    border-color: var(--success-border);
}

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

.separated-form {
    margin-top: 12px;
}

.inline-form {
    display: inline;
}

.link-button {
    padding: 0;
    color: var(--primary);
    background: transparent;
    border: 0;
    cursor: pointer;
}

.link-button:hover {
    text-decoration: underline;
}

.account-details {
    margin-bottom: 0;
}

.account-details div {
    display: grid;
    padding: 14px 0;
    grid-template-columns: 160px 1fr;
    gap: 20px;
    border-bottom: 1px solid var(--border);
}

.account-details div:last-child {
    border-bottom: 0;
}

.account-details dt {
    font-weight: 700;
}

.account-details dd {
    margin: 0;
    color: var(--muted);
}

@media (max-width: 640px) {
    .navigation {
        padding-block: 16px;
        align-items: flex-start;
        flex-direction: column;
    }

    .navigation nav {
        width: 100%;
        flex-wrap: wrap;
    }

    .hero,
    .auth-card,
    .dashboard-card {
        padding: 24px;
    }

    .account-details div {
        grid-template-columns: 1fr;
        gap: 4px;
    }
}

/* Phase 5: accessibility */
.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 9999;
    padding: 10px 14px;
    color: #ffffff;
    background: var(--primary);
    border-radius: var(--radius);
    transform: translateY(-160%);
    transition: transform 0.15s ease;
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid rgba(29, 78, 216, 0.35); outline-offset: 3px; }
main:focus { outline: none; }
select, textarea { font: inherit; }
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}