:root {
    color-scheme: light;
    --bg: #f5f7fa;
    --surface: #ffffff;
    --surface-alt: #eef3f8;
    --line: #dce3eb;
    --text: #17202a;
    --muted: #637083;
    --primary: #1769aa;
    --primary-dark: #0f4d7d;
    --success: #1f7a4f;
    --warning: #9a5b00;
    --danger: #b42318;
    --radius: 8px;
    font-family: Arial, Helvetica, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
}

a {
    text-decoration: none;
}

button,
input,
textarea {
    font: inherit;
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 248px minmax(0, 1fr);
}

.sidebar {
    background: #152232;
    color: #edf3f8;
    padding: 20px 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}

.brand-mark {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    background: #22a6b3;
    color: #ffffff;
    font-weight: 700;
}

.brand-name {
    font-weight: 700;
    font-size: 18px;
}

.brand-subtitle {
    color: #aebecd;
    font-size: 12px;
    margin-top: 2px;
}

.nav-list {
    display: grid;
    gap: 4px;
}

.nav-item {
    width: 100%;
    border: 0;
    border-radius: 6px;
    padding: 11px 12px;
    background: transparent;
    color: #c8d5e1;
    text-align: left;
    cursor: pointer;
}

.nav-item:hover,
.nav-item.is-active {
    background: #203348;
    color: #ffffff;
}

.main {
    min-width: 0;
    padding: 22px;
}

.topbar {
    min-height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    margin-bottom: 18px;
}

.topbar h1,
.panel h2,
.dialog-header h2 {
    margin: 0;
}

.topbar h1 {
    font-size: 28px;
}

.topbar p,
.dialog-header p {
    margin: 4px 0 0;
    color: var(--muted);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search,
input,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 10px 11px;
    background: #ffffff;
    color: var(--text);
}

.search {
    width: 240px;
}

.primary-button,
.secondary-button,
.text-button,
.icon-button,
.tab {
    border: 0;
    border-radius: 6px;
    cursor: pointer;
}

.primary-button {
    padding: 10px 14px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
}

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

.secondary-button {
    padding: 10px 14px;
    background: var(--surface-alt);
    color: var(--text);
}

.text-button {
    padding: 8px 10px;
    background: transparent;
    color: var(--primary);
    font-weight: 700;
}

.compact {
    padding: 8px 10px;
}

.icon-button {
    width: 34px;
    height: 34px;
    background: var(--surface-alt);
}

.notice {
    border-radius: var(--radius);
    padding: 12px 14px;
    margin-bottom: 16px;
    background: #e9f6ef;
    color: var(--success);
    border: 1px solid #c6ead8;
}

.notice.is-error {
    background: #fff1f0;
    color: var(--danger);
    border-color: #ffd2cc;
}

.view {
    display: none;
}

.view.is-active {
    display: block;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 16px;
}

.metric,
.panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.metric {
    padding: 16px;
}

.metric span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 8px;
}

.metric strong {
    font-size: 30px;
}

.workspace-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, .8fr);
    gap: 16px;
}

.panel {
    padding: 16px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.panel h2 {
    font-size: 18px;
}

.document-list {
    display: grid;
    gap: 10px;
}

.document-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fbfcfd;
}

.document-title {
    font-weight: 700;
}

.document-meta {
    margin-top: 4px;
    color: var(--muted);
    font-size: 13px;
}

.status-pill {
    border-radius: 999px;
    padding: 5px 9px;
    background: #eaf3fb;
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 700;
}

.empty-state {
    padding: 28px;
    border: 1px dashed var(--line);
    border-radius: var(--radius);
    color: var(--muted);
    text-align: center;
    background: #fbfcfd;
}

.activity-list {
    margin: 0;
    padding-left: 18px;
    color: var(--muted);
}

.form-panel {
    max-width: 680px;
}

form {
    display: grid;
    gap: 14px;
}

label {
    display: grid;
    gap: 6px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.auth-dialog {
    width: min(460px, calc(100% - 32px));
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0;
}

.auth-dialog::backdrop {
    background: rgba(10, 18, 28, .55);
}

.dialog-header {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    padding: 18px;
    border-bottom: 1px solid var(--line);
}

.tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 12px;
    gap: 8px;
}

.tab {
    padding: 10px;
    background: var(--surface-alt);
}

.tab.is-active {
    background: var(--primary);
    color: #ffffff;
}

.auth-form {
    display: none;
    padding: 0 18px 18px;
}

.auth-form.is-active {
    display: grid;
}

.marketing-page {
    min-height: 100vh;
    background: #f6f8fb;
}

.marketing-hero {
    min-height: 72vh;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
    gap: 48px;
    align-items: center;
    max-width: 1180px;
    margin: 0 auto;
    padding: 56px 28px 44px;
}

.hero-copy {
    display: grid;
    gap: 22px;
}

.hero-copy .brand {
    color: var(--text);
    margin-bottom: 6px;
}

.hero-copy .brand-subtitle {
    color: var(--muted);
}

.hero-copy h1 {
    max-width: 720px;
    margin: 0;
    font-size: 54px;
    line-height: 1.02;
    letter-spacing: 0;
}

.hero-copy p {
    max-width: 680px;
    margin: 0;
    color: var(--muted);
    font-size: 18px;
    line-height: 1.55;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.desktop-preview {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 20px 55px rgba(15, 35, 52, .12);
}

.preview-topbar {
    height: 38px;
    background: #1769aa;
}

.preview-body {
    display: grid;
    grid-template-columns: 96px 1fr;
    min-height: 360px;
}

.preview-body aside {
    background: #152232;
}

.preview-body section {
    padding: 22px;
    background: #edf3f8;
}

.preview-toolbar {
    height: 38px;
    margin-bottom: 16px;
    border-radius: 6px;
    background: #ffffff;
    border: 1px solid var(--line);
}

.preview-page {
    height: 260px;
    padding: 34px;
    display: grid;
    align-content: start;
    gap: 16px;
    background: #ffffff;
    border: 1px solid #b9c6d8;
}

.preview-page span {
    display: block;
    height: 12px;
    border-radius: 999px;
    background: #dce3eb;
}

.preview-page span:nth-child(2) {
    width: 74%;
}

.preview-page span:nth-child(3) {
    width: 58%;
}

.preview-page strong {
    width: 170px;
    margin-top: 26px;
    padding: 14px;
    border: 2px solid #f0b11c;
    background: #fff8dd;
    color: #475569;
}

.info-band,
.steps-band {
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px;
}

.info-band {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.info-band article,
.steps-band {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 22px;
}

.info-band h2,
.steps-band h2 {
    margin: 0 0 10px;
    font-size: 20px;
}

.info-band p,
.steps-band li {
    color: var(--muted);
    line-height: 1.5;
}

.steps-band ol {
    margin: 0;
    padding-left: 22px;
}

@media (max-width: 920px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: sticky;
        top: 0;
        z-index: 3;
        padding: 12px;
    }

    .brand {
        margin-bottom: 12px;
    }

    .nav-list {
        grid-template-columns: repeat(5, minmax(110px, 1fr));
        overflow-x: auto;
    }

    .topbar,
    .topbar-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .search {
        width: 100%;
    }

    .metric-grid,
    .workspace-grid,
    .marketing-hero,
    .info-band {
        grid-template-columns: 1fr;
    }

    .hero-copy h1 {
        font-size: 38px;
    }
}