:root {
    color-scheme: light;
    --background: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --border: #dfe5ee;
    --border-strong: #c6cfdd;
    --control-border: #b8c4d6;
    --text: #172033;
    --text-muted: #64748b;
    --text-subtle: #8994a7;
    --primary: #3157d5;
    --primary-dark: #2444b8;
    --primary-soft: #eaf0ff;
    --success: #17845a;
    --success-soft: #e7f7f0;
    --danger: #c73b4b;
    --danger-dark: #a82b39;
    --danger-soft: #fff0f2;
    --shadow: 0 18px 45px rgba(30, 49, 84, 0.08);
    --header-background: rgba(255, 255, 255, 0.94);
    --hover-surface: #fbfcff;
    --input-background: #ffffff;
    --input-border: #cbd4e1;
    --on-accent: #ffffff;
    --button-primary: #3157d5;
    --button-primary-hover: #2444b8;
    --button-shadow: rgba(49, 87, 213, 0.2);
    --focus-ring: rgba(49, 87, 213, 0.24);
    --shared-text: #76520b;
    --shared-soft: #fff3cf;
    --warning-text: #925d0b;
    --warning-soft: #fff5d9;
    --radius: 16px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --background: #0f1012;
    --surface: #181a1d;
    --surface-muted: #22252a;
    --border: #353941;
    --border-strong: #50555e;
    --control-border: #5b616b;
    --text: #f1f3f5;
    --text-muted: #a6abb3;
    --text-subtle: #898e96;
    --primary: #dfe2e6;
    --primary-dark: #ffffff;
    --primary-soft: #2c3036;
    --success: #70d8ad;
    --success-soft: #173b31;
    --danger: #ff9aaa;
    --danger-dark: #ffb0bd;
    --danger-soft: #48222c;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.24);
    --header-background: rgba(24, 26, 29, 0.96);
    --hover-surface: #1e2125;
    --input-background: #111315;
    --input-border: #4a5059;
    --button-primary: #41464e;
    --button-primary-hover: #555b65;
    --button-shadow: rgba(0, 0, 0, 0.22);
    --focus-ring: rgba(223, 226, 230, 0.34);
    --shared-text: #d7dade;
    --shared-soft: #30343a;
    --warning-text: #ffd078;
    --warning-soft: #4c3816;
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    min-height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    color: var(--text);
    background: var(--background);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.5;
}

a {
    color: inherit;
}

button,
input,
select,
textarea {
    font: inherit;
}

.container {
    width: min(1080px, calc(100% - 40px));
    margin: 0 auto;
}

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

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

.brand {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 1.15rem;
    font-weight: 750;
    text-decoration: none;
    letter-spacing: -0.02em;
}

.brand-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    color: var(--on-accent);
    background: var(--button-primary);
}

.header-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.user-menu {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.88rem;
    white-space: nowrap;
}

.user-greeting strong {
    color: var(--text);
}

.header-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    font-weight: 700;
    text-decoration: none;
}

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

.inline-form {
    display: inline-flex;
    margin: 0;
}

.button-link {
    padding: 0 2px;
    border: 0;
    color: var(--primary);
    background: transparent;
    cursor: pointer;
}

.page-content {
    flex: 1;
    padding-block: 48px 64px;
}

.site-footer {
    padding: 20px 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    background: var(--surface);
    font-size: 0.85rem;
    text-align: center;
}

.site-footer p {
    margin: 0;
}

.page-heading,
.detail-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
}

.page-heading {
    margin-bottom: 30px;
}

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

h1 {
    margin-bottom: 8px;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    line-height: 1.15;
    letter-spacing: -0.04em;
}

h2 {
    font-size: 1rem;
}

.eyebrow {
    margin-bottom: 8px;
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 750;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.heading-copy,
.form-heading > p:last-child,
.confirm-card > p,
.muted {
    color: var(--text-muted);
}

.heading-copy {
    margin-bottom: 0;
}

.button {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 16px;
    border: 1px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
    text-decoration: none;
    transition: background 150ms ease, border-color 150ms ease, transform 150ms ease;
}

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

.button:focus-visible,
.button-link:focus-visible,
.header-link:focus-visible,
.action-link:focus-visible,
.task-title:focus-visible,
.status-toggle:focus-visible,
.text-link:focus-visible,
.brand:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 2px;
}

.button-primary {
    color: var(--on-accent);
    background: var(--button-primary);
    box-shadow: 0 8px 18px var(--button-shadow);
}

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

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

.button-secondary:hover {
    border-color: var(--border-strong);
    background: var(--surface-muted);
}

.button-danger,
.button-danger-ghost:hover {
    color: var(--on-accent);
    background: var(--danger);
}

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

.button-danger-ghost {
    border-color: #f2cbd0;
    color: var(--danger);
    background: var(--danger-soft);
}

.task-panel,
.detail-card,
.form-card,
.confirm-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.scope-tabs {
    margin-bottom: 18px;
    display: flex;
    gap: 8px;
    overflow-x: auto;
}

.scope-tab {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 13px;
    border: 1px solid var(--border);
    border-radius: 99px;
    color: var(--text-muted);
    background: var(--surface);
    font-size: 0.84rem;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
}

.scope-tab span {
    min-width: 22px;
    padding: 1px 6px;
    border-radius: 99px;
    background: var(--surface-muted);
    text-align: center;
}

.scope-tab:hover,
.scope-tab.is-active {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-soft);
}

.panel-heading {
    padding: 18px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
}

.panel-heading h2 {
    margin: 0;
}

.task-count {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.task-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.task-item {
    padding: 20px 22px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--border);
}

.task-item:last-child {
    border-bottom: 0;
}

.task-item:hover {
    background: var(--hover-surface);
}

.task-item.reminder-overdue {
    box-shadow: inset 3px 0 0 var(--danger);
}

.task-item.reminder-today {
    box-shadow: inset 3px 0 0 var(--warning-text);
}

.toggle-form {
    display: flex;
}

.status-toggle {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    padding: 0;
    border: 2px solid var(--control-border);
    border-radius: 50%;
    color: var(--on-accent);
    background: var(--input-background);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 800;
}

.status-toggle:hover {
    border-color: var(--primary);
}

.is-completed .status-toggle {
    border-color: var(--success);
    background: var(--success);
}

.task-main {
    min-width: 0;
}

.task-title {
    max-width: 100%;
    display: inline-block;
    margin-bottom: 3px;
    font-weight: 750;
    text-decoration: none;
    overflow-wrap: anywhere;
}

.task-title:hover {
    color: var(--primary);
}

.is-completed .task-title {
    color: var(--text-muted);
    text-decoration: line-through;
}

.task-description {
    margin-bottom: 5px;
    overflow: hidden;
    color: var(--text-muted);
    font-size: 0.92rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.task-meta {
    color: var(--text-subtle);
    font-size: 0.76rem;
}

.task-meta-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 7px;
}

.scope-badge {
    display: inline-flex;
    padding: 2px 7px;
    border-radius: 99px;
    color: var(--primary);
    background: var(--primary-soft);
    font-size: 0.7rem;
    font-weight: 750;
}

.scope-badge.shared {
    color: var(--shared-text);
    background: var(--shared-soft);
}

.reminder-summary {
    margin-bottom: 18px;
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 13px;
    border: 1px solid var(--border-strong);
    border-radius: 12px;
    background: var(--surface);
}

.reminder-summary-icon {
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--warning-soft);
}

.reminder-summary h2 {
    margin: 0 0 2px;
    font-size: 0.95rem;
}

.reminder-summary p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.reminder-row {
    margin-top: 8px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 7px;
}

.reminder-badge,
.recurrence-label,
.detail-reminder-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 99px;
    color: var(--text-muted);
    background: var(--surface-muted);
    font-size: 0.72rem;
    font-weight: 700;
}

.reminder-badge.overdue,
.detail-reminder-status.overdue {
    color: var(--danger);
    background: var(--danger-soft);
}

.reminder-badge.today,
.detail-reminder-status.today {
    color: var(--warning-text);
    background: var(--warning-soft);
}

.reminder-badge.upcoming {
    color: var(--primary);
    background: var(--primary-soft);
}

.recurrence-label {
    color: var(--shared-text);
    background: var(--shared-soft);
}

.task-actions,
.detail-actions,
.form-actions,
.detail-footer {
    display: flex;
    align-items: center;
    gap: 10px;
}

.action-link,
.text-link,
.breadcrumb a {
    color: var(--primary);
    font-size: 0.88rem;
    font-weight: 700;
    text-decoration: none;
}

.action-link:hover,
.text-link:hover,
.breadcrumb a:hover {
    text-decoration: underline;
}

.action-danger,
.danger-text {
    color: var(--danger);
}

.empty-state {
    padding: 64px 24px;
    text-align: center;
}

.empty-state h2 {
    margin-bottom: 8px;
    font-size: 1.25rem;
}

.empty-state p {
    margin-bottom: 22px;
    color: var(--text-muted);
}

.empty-icon,
.warning-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 18px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    font-size: 1.4rem;
    font-weight: 800;
}

.empty-icon {
    color: var(--primary);
    background: var(--primary-soft);
}

.warning-icon {
    color: var(--danger);
    background: var(--danger-soft);
}

.messages {
    margin-bottom: 22px;
}

.message {
    padding: 13px 16px;
    border: 1px solid #bee7d5;
    border-radius: 10px;
    color: #126947;
    background: var(--success-soft);
    font-size: 0.92rem;
}

.breadcrumb {
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.88rem;
}

.detail-card,
.form-card {
    padding: clamp(24px, 5vw, 42px);
}

.status-badge {
    display: inline-block;
    margin-bottom: 14px;
    padding: 5px 10px;
    border-radius: 99px;
    color: var(--warning-text);
    background: var(--warning-soft);
    font-size: 0.75rem;
    font-weight: 750;
}

.status-badge.completed {
    color: var(--success);
    background: var(--success-soft);
}

.detail-body {
    margin: 34px 0;
    padding: 24px 0;
    border-block: 1px solid var(--border);
}

.detail-body h2 {
    margin-bottom: 10px;
}

.detail-body p:last-child {
    margin-bottom: 0;
    overflow-wrap: anywhere;
}

.detail-meta {
    margin: 0 0 34px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.detail-meta dt {
    margin-bottom: 3px;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.detail-meta dd {
    margin: 0;
    font-size: 0.92rem;
    font-weight: 650;
    overflow-wrap: anywhere;
}

.detail-reminder-status {
    margin-left: 5px;
    vertical-align: middle;
}

.detail-footer {
    justify-content: space-between;
}

.form-card {
    max-width: 720px;
    margin: 0 auto;
}

.form-heading {
    margin-bottom: 30px;
}

.form-heading h1 {
    font-size: 2rem;
}

.form-group {
    margin-bottom: 22px;
}

.form-fieldset {
    margin: 0 0 26px;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.form-fieldset legend {
    padding: 0 7px;
    font-size: 0.95rem;
    font-weight: 800;
}

.fieldset-copy {
    margin: 0 0 18px;
    color: var(--text-muted);
    font-size: 0.84rem;
}

.form-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 18px;
}

.form-grid .form-group {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 7px;
    font-size: 0.9rem;
    font-weight: 750;
}

.form-group input,
.form-group select,
.form-group textarea {
    min-width: 0;
    width: 100%;
    padding: 11px 13px;
    border: 1px solid var(--input-border);
    border-radius: 9px;
    color: var(--text);
    background: var(--input-background);
}

.form-group textarea {
    resize: vertical;
}

.form-group select {
    min-height: 46px;
}

.form-group small,
.field-help {
    display: block;
    margin-top: 6px;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.field-help ul {
    margin: 6px 0 0;
    padding-left: 20px;
}

.field-errors ul,
.form-errors ul {
    margin: 7px 0 0;
    padding-left: 20px;
    color: var(--danger);
    font-size: 0.84rem;
}

.confirm-card {
    max-width: 580px;
    margin: 40px auto 0;
    padding: 42px;
    text-align: center;
}

.confirm-card h1 {
    font-size: 2rem;
}

.confirm-card .form-actions {
    margin-top: 28px;
    justify-content: center;
}

.auth-card {
    max-width: 520px;
}

.auth-submit {
    width: 100%;
}

.auth-help {
    margin: 24px 0 0;
    color: var(--text-muted);
    font-size: 0.82rem;
    text-align: center;
}

.auth-error {
    margin-bottom: 20px;
}

.account-section {
    max-width: 820px;
    margin: 0 auto;
}

.account-heading {
    margin-bottom: 24px;
}

.account-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.account-card {
    min-width: 0;
    padding: 26px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.account-card h2 {
    margin-bottom: 18px;
    font-size: 1.1rem;
}

.account-card > p {
    margin-bottom: 20px;
    color: var(--text-muted);
}

.account-details {
    margin: 0;
}

.account-details div + div {
    margin-top: 18px;
}

.account-details dt {
    margin-bottom: 3px;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.account-details dd {
    margin: 0;
    font-weight: 700;
    overflow-wrap: anywhere;
}

.account-actions {
    display: flex;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 10px;
}

.account-actions form {
    display: flex;
}

.account-back {
    display: inline-flex;
    margin-top: 24px;
    padding-block: 10px;
}

.theme-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.theme-option {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    background: var(--surface-muted);
    cursor: pointer;
    font-weight: 700;
}

.theme-option:hover,
.theme-option[aria-pressed="true"] {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-soft);
}

.theme-option:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 2px;
}

.setting-status,
.install-instructions {
    margin: 12px 0 0;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.install-card .button[hidden] {
    display: none;
}

@media (max-width: 700px) {
    .container {
        width: min(100% - 24px, 1080px);
    }

    .page-content {
        padding-block: 32px 48px;
    }

    .header-label {
        display: none;
    }

    .user-greeting {
        display: none;
    }

    .user-menu {
        gap: 10px;
    }

    .page-heading,
    .detail-heading {
        flex-direction: column;
    }

    .page-heading .button,
    .detail-actions,
    .detail-actions .button {
        width: 100%;
    }

    .task-item {
        grid-template-columns: auto minmax(0, 1fr);
        align-items: start;
    }

    .task-actions {
        grid-column: 2;
    }

    .task-actions .action-link {
        min-height: 42px;
        display: inline-flex;
        align-items: center;
    }

    .detail-meta {
        grid-template-columns: 1fr;
    }

    .detail-footer {
        align-items: stretch;
        flex-direction: column;
    }

    .detail-footer form,
    .detail-footer .button {
        width: 100%;
    }

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

    .form-grid {
        grid-template-columns: 1fr;
    }

    .account-grid {
        grid-template-columns: 1fr;
    }

    .account-card {
        padding: 24px 20px;
    }

    .account-actions,
    .account-actions form,
    .account-actions .button {
        width: 100%;
    }

    .confirm-card {
        padding: 30px 22px;
    }
}

@media (max-width: 380px) {
    .header-content {
        gap: 12px;
    }

    .brand {
        gap: 8px;
        font-size: 1rem;
    }

    .brand-mark {
        width: 32px;
        height: 32px;
    }

    .user-menu {
        gap: 8px;
    }

    .task-item {
        padding-inline: 16px;
        gap: 12px;
    }
}