:root {
    --bg: #e7eef7;
    --surface: #ffffff;
    --surface-2: #f4f7fb;
    --column: #eef3f9;
    --text: #152033;
    --muted: #5b6b80;
    --border: #d4deea;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #dbeafe;
    --danger: #dc2626;
    --danger-soft: #fee2e2;
    --ok: #059669;
    --ok-soft: #d1fae5;
    --shadow: 0 1px 2px rgba(21, 32, 51, 0.05), 0 10px 28px rgba(21, 32, 51, 0.07);
    --shadow-card: 0 1px 2px rgba(21, 32, 51, 0.06), 0 8px 20px rgba(37, 99, 235, 0.06);
    --radius: 14px;
    --header-h: 60px;
    --sidebar-w: min(380px, 100vw);
    --focus: 0 0 0 3px rgba(37, 99, 235, 0.28);
    font-family: "Segoe UI", Inter, system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
    --bg: #0b1220;
    --surface: #151d2c;
    --surface-2: #1b2536;
    --column: #121a28;
    --text: #e8eef7;
    --muted: #93a1b5;
    --border: #2a384c;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-soft: #1d3a5f;
    --danger: #f87171;
    --danger-soft: #3f1d1d;
    --ok: #34d399;
    --ok-soft: #12382c;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 14px 32px rgba(0, 0, 0, 0.32);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 22px rgba(0, 0, 0, 0.28);
    --focus: 0 0 0 3px rgba(96, 165, 250, 0.35);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    min-height: 100dvh;
    overflow: hidden;
}

body.auth-body {
    overflow: auto;
    height: auto;
}

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

a {
    color: var(--accent);
}

:focus-visible {
    outline: none;
    box-shadow: var(--focus);
}

.app {
    height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    position: relative;
    height: var(--header-h);
    min-height: var(--header-h);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
    z-index: 20;
}

[data-theme="dark"] .header {
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    letter-spacing: 0.04em;
    font-size: 0.95rem;
    white-space: nowrap;
}

.brand-mark {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 0.85rem;
}

.header-spacer {
    flex: 1;
}

.export-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.export-actions-menu {
    display: none;
}

.nav-toggle,
.icon-btn,
.btn {
    min-height: 44px;
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 10px;
    padding: 0 12px;
    cursor: pointer;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.icon-btn {
    min-width: 44px;
    gap: 6px;
}

.btn-primary {
    background: var(--accent);
    border-color: transparent;
    color: #fff;
}

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

.btn-danger {
    background: var(--danger);
    border-color: transparent;
    color: #fff;
}

.btn-ghost {
    background: transparent;
}

.btn-soft {
    background: var(--accent-soft);
    border-color: transparent;
    color: var(--accent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.user-chip {
    color: var(--muted);
    font-size: 0.85rem;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-toggle {
    display: none;
}

.theme-when-dark {
    display: none;
}

[data-theme="dark"] .theme-when-light {
    display: none;
}

[data-theme="dark"] .theme-when-dark {
    display: inline;
}

.workspace {
    flex: 1;
    min-height: 0;
    display: flex;
    position: relative;
}

.board-wrap {
    flex: 1;
    min-width: 0;
    min-height: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.board {
    display: flex;
    align-items: stretch;
    gap: 14px;
    padding: 14px;
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    flex: 1 1 auto;
    min-height: 0;
    height: 100%;
    touch-action: pan-x;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
    background:
        radial-gradient(1200px 400px at 10% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 50%),
        var(--bg);
}

.column {
    scroll-snap-align: start;
    flex: 1 1 0;
    min-width: min(170px, 86vw);
    height: 100%;
    max-height: 100%;
    background: var(--column);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.column-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
    padding: 10px;
    min-width: 0;
}

.column-label {
    min-width: 0;
    flex: 1 1 5rem;
    overflow: hidden;
}

.column-title {
    margin: 0;
    font-size: 0.92rem;
    font-weight: 750;
    letter-spacing: 0.01em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.column-count {
    color: var(--muted);
    font-weight: 500;
    font-size: 0.8rem;
}

.column-actions {
    display: flex;
    flex: 0 0 auto;
    gap: 4px;
    margin-left: auto;
}

.column-actions .icon-btn {
    min-height: 32px;
    min-width: 32px;
    width: 32px;
    height: 32px;
    padding: 0;
    font-size: 0.78rem;
    line-height: 1;
}

.column-actions .column-hide {
    font-size: 0.95rem;
    font-weight: 650;
}

.column-actions .icon-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.columns-menu {
    position: relative;
}

#btn-columns.has-hidden {
    border-color: var(--accent);
}

.columns-panel {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    z-index: 30;
    min-width: min(280px, calc(100vw - 28px));
    padding: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.columns-panel-hint {
    margin: 0 0 10px;
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.35;
}

.columns-panel-row {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 40px;
    padding: 2px 4px;
    border-radius: 8px;
    cursor: pointer;
}

.columns-panel-row:hover {
    background: var(--surface-2);
}

.columns-panel-row input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.column-body {
    flex: 1 1 0;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 0 10px 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.column-body > .card {
    flex: 0 0 auto;
}

.card {
    container-type: inline-size;
    container-name: card;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 12px 10px;
    box-shadow: var(--shadow-card);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--accent);
}

.card:hover {
    transform: translateY(-1px);
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
    box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 12%, transparent);
}

.card.selected {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.card-top {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.card-handle {
    cursor: grab;
    color: var(--muted);
    user-select: none;
    min-width: 20px;
    text-align: center;
    line-height: 1.2;
}

.card-title {
    margin: 0;
    font-size: 0.98rem;
    font-weight: 700;
    flex: 1;
    line-height: 1.3;
}

.card-body {
    margin: 8px 0 0;
    color: var(--text);
}

.card-body .ql-editor {
    min-height: 0;
    max-height: none;
    overflow: visible;
    padding: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text);
}

.card-body .ql-editor p {
    margin: 0 0 0.45em;
}

.card-body .ql-editor p:last-child {
    margin-bottom: 0;
}

.card-body .ql-editor ul,
.card-body .ql-editor ol {
    margin: 0.25em 0 0.45em;
    padding-left: 1.3em;
}

.card-body .ql-editor h1,
.card-body .ql-editor h2,
.card-body .ql-editor h3 {
    margin: 0.15em 0 0.4em;
    line-height: 1.25;
    color: var(--text);
}

.card-body .ql-editor h1 { font-size: 1.15rem; }
.card-body .ql-editor h2 { font-size: 1.05rem; }
.card-body .ql-editor h3 { font-size: 1rem; }

.card-body .ql-editor strong,
.card-body .ql-editor b {
    font-weight: 700;
    color: var(--text);
}

.card-body .ql-editor em,
.card-body .ql-editor i {
    font-style: italic;
}

.card-body .ql-editor u {
    text-decoration: underline;
}

.card-body .ql-editor s,
.card-body .ql-editor strike {
    text-decoration: line-through;
}

.card-body .ql-editor a {
    color: var(--accent);
}

.card-meta {
    display: flex;
    align-items: center;
    margin-top: 8px;
}

.card-sub {
    margin: 0;
    color: var(--muted);
    font-size: 0.75rem;
    min-width: 0;
    flex: 1;
}

.card-actions .card-move {
    flex: 0 0 auto;
    align-self: center;
    min-width: 0;
    margin: 0;
}

.card-move-select {
    -webkit-appearance: none;
    appearance: none;
    display: block;
    box-sizing: border-box;
    width: auto;
    max-width: 100%;
    height: 27px;
    min-height: 27px;
    max-height: 27px;
    margin: 0;
    border: 1px solid color-mix(in srgb, var(--border) 65%, #fff);
    border-radius: 999px;
    background-color: color-mix(in srgb, var(--surface-2) 62%, #fff);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='%2393a1b5' d='M1 1l4 4 4-4'/></svg>");
    background-repeat: no-repeat;
    background-position: right 7px center;
    background-size: 8px 5px;
    color: var(--text);
    padding: 0 20px 0 9px;
    font-family: inherit;
    font-size: 0.5625rem;
    font-weight: 400;
    line-height: 25px;
    text-align: left;
    cursor: pointer;
}

.card-reminder {
    display: block;
    width: 100%;
    margin-top: 8px;
    min-height: 27px;
    padding: 0 9px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface-2);
    font-size: 0.5625rem;
    font-weight: 650;
    text-align: left;
    cursor: pointer;
}

.card-reminder.unset {
    color: var(--muted);
    font-weight: 500;
}

.card-reminder.upcoming,
.reminder-item.upcoming {
    color: var(--ok);
}

.card-reminder.overdue,
.reminder-item.overdue {
    color: var(--danger);
}

.reminder-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    width: 100%;
    margin-bottom: 8px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-2);
    text-align: left;
    cursor: pointer;
}

.reminder-item strong {
    color: var(--text);
}

.reminder-item span {
    font-size: 0.85rem;
    font-weight: 650;
}

.card-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-start;
    gap: 4px;
    margin-top: 8px;
}

.card-actions .icon-btn {
    min-height: 27px;
    min-width: 33px;
    padding: 0 9px;
    font-size: 0.5625rem;
    border-radius: 999px;
    background: var(--surface-2);
    text-align: center;
}

@media (min-width: 2560px) {
    .card-actions {
        gap: 5px;
    }

    .card-actions .icon-btn {
        min-height: 31px;
        min-width: 38px;
        padding: 0 10px;
        font-size: 0.647rem;
    }

    .card-move-select {
        height: 31px;
        min-height: 31px;
        max-height: 31px;
        padding: 0 23px 0 10px;
        font-size: 0.647rem;
        line-height: 29px;
        background-position: right 8px center;
        background-size: 9px 6px;
    }

    .card-reminder {
        min-height: 31px;
        padding: 0 10px;
        font-size: 0.647rem;
    }
}

.recycle {
    display: none;
    flex: 1;
    min-height: 0;
    overflow: auto;
    padding: 12px;
}

.app.view-recycle .board {
    display: none;
}

.app.view-recycle .recycle {
    display: block;
}

.recycle-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
}

.recycle-meta {
    color: var(--muted);
    font-size: 0.8rem;
}

.ai-sidebar {
    display: none;
    width: var(--sidebar-w);
    background: var(--surface);
    border-left: 1px solid var(--border);
    flex-direction: column;
    min-height: 0;
}

.app.ai-pinned .ai-sidebar {
    display: flex;
}

.ai-head,
.ai-compose {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.ai-compose {
    border-bottom: 0;
    border-top: 1px solid var(--border);
}

.ai-head h2 {
    margin: 0;
    font-size: 0.95rem;
    flex: 1;
}

.ai-messages {
    flex: 1;
    overflow: auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-msg {
    max-width: 95%;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.ai-msg.user {
    margin-left: auto;
    background: var(--accent-soft);
}

.ai-msg.assistant {
    background: var(--surface-2);
    border: 1px solid var(--border);
}

.ai-msg.ai-card-chip {
    font-weight: 650;
}

.ai-msg.ai-card-chip.upcoming {
    color: var(--ok);
}

.ai-msg.ai-card-chip.overdue {
    color: var(--danger);
}

.ai-compose input {
    flex: 1;
    min-width: 0;
    min-height: 44px;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0 10px;
    background: var(--surface-2);
}

.ai-edge {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 25;
    border-radius: 10px 0 0 10px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    min-height: 96px;
    padding: 16px 10px;
    display: none;
    align-items: center;
    justify-content: center;
    text-align: center;
    letter-spacing: 0.06em;
}

.app:not(.ai-pinned) .ai-edge {
    display: inline-flex;
}

.ai-backdrop {
    display: none;
}

.toast-wrap {
    position: fixed;
    right: 12px;
    bottom: 12px;
    z-index: 80;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: min(360px, calc(100vw - 24px));
}

.toast {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 10px;
    padding: 12px 14px;
    box-shadow: var(--shadow);
    font-size: 0.9rem;
}

.toast.error {
    border-left-color: var(--danger);
}

.toast.ok {
    border-left-color: var(--ok);
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 20, 27, 0.45);
    z-index: 50;
    display: none;
    align-items: stretch;
    justify-content: center;
    padding: 0;
}

.modal-backdrop.open {
    display: flex;
}

.modal {
    background: var(--surface);
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-head,
.modal-foot {
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.modal-foot {
    border-bottom: 0;
    border-top: 1px solid var(--border);
    justify-content: flex-end;
}

.modal-head h2 {
    margin: 0;
    font-size: 1rem;
    flex: 1;
}

.modal-body {
    flex: 1;
    overflow: auto;
    padding: 12px;
}

.export-format-hint {
    margin: 0 0 12px;
    color: var(--muted);
}

.export-formats {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.export-formats label {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 40px;
    padding: 0 6px;
    border-radius: 8px;
    cursor: pointer;
}

.export-formats label:hover {
    background: var(--surface-2);
}

.export-formats input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
}

.field input,
.field textarea {
    min-height: 44px;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 10px;
    background: var(--surface-2);
    color: var(--text);
    width: 100%;
}

#reminder-when {
    color-scheme: light;
    background: #ffffff;
    color: #152033;
    caret-color: #152033;
}

[data-theme="dark"] #reminder-when {
    color-scheme: dark;
    background: #0f1724;
    color: #f3f7ff;
    caret-color: #f3f7ff;
    border-color: #4b5d75;
}

#reminder-when::-webkit-datetime-edit,
#reminder-when::-webkit-datetime-edit-fields-wrapper,
#reminder-when::-webkit-datetime-edit-text,
#reminder-when::-webkit-datetime-edit-year-field,
#reminder-when::-webkit-datetime-edit-month-field,
#reminder-when::-webkit-datetime-edit-day-field,
#reminder-when::-webkit-datetime-edit-hour-field,
#reminder-when::-webkit-datetime-edit-minute-field,
#reminder-when::-webkit-datetime-edit-ampm-field {
    color: inherit;
    background: transparent;
}

#reminder-when::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: 0.85;
    filter: none;
}

[data-theme="dark"] #reminder-when::-webkit-calendar-picker-indicator {
    filter: invert(1);
}

.ql-toolbar.ql-snow,
.ql-container.ql-snow {
    border-color: var(--border);
    background: var(--surface);
}

.ql-toolbar.ql-snow {
    white-space: normal;
}

.ql-container.ql-snow {
    min-height: 160px;
}

.ql-container .ql-editor {
    min-height: 160px;
}

.history-item {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px;
    margin-bottom: 8px;
    background: var(--surface-2);
}

.history-item strong {
    display: block;
    margin-bottom: 4px;
}

.history-item time {
    color: var(--muted);
    font-size: 0.8rem;
}

.auth-page {
    min-height: 100dvh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-card {
    width: min(420px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 24px;
}

.auth-card .btn-primary {
    width: 100%;
}

.auth-card h1 {
    margin: 0 0 6px;
    font-size: 1.4rem;
}

.auth-card p.lead {
    margin: 0 0 18px;
    color: var(--muted);
}

.auth-links {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin: 10px 0 0;
}

.auth-card .btn-ghost {
    width: 100%;
}

.form-status {
    min-height: 1.3em;
    margin: 0 0 12px;
    font-size: 0.9rem;
}

.form-status.ok {
    color: var(--ok);
}

.form-status.error {
    color: var(--danger);
}

.hidden {
    display: none !important;
}

.sortable-ghost {
    opacity: 0.45;
}

@media (min-width: 768px) {
    .modal-backdrop {
        padding: 28px 16px;
        align-items: center;
    }

    .modal {
        width: min(720px, 100%);
        height: auto;
        max-height: min(860px, calc(100dvh - 56px));
        border-radius: 16px;
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
    }
}

@media (min-width: 1280px) {
    .app.ai-pinned .workspace {
        display: grid;
        grid-template-columns: minmax(0, 1fr) var(--sidebar-w);
        min-height: 0;
        height: 100%;
    }

    .app.ai-pinned .board-wrap,
    .app.ai-pinned .ai-sidebar {
        min-height: 0;
        height: 100%;
    }

    .app.ai-pinned .ai-sidebar {
        position: static;
        width: auto;
        box-shadow: none;
    }
}

@media (max-width: 1279px) {
    .app.ai-pinned .ai-sidebar {
        position: fixed;
        top: var(--header-h);
        right: 0;
        bottom: 0;
        z-index: 30;
        width: min(380px, 86vw);
        box-shadow: var(--shadow);
    }

    .app.ai-pinned .ai-backdrop {
        display: block;
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(15, 20, 27, 0.4);
        z-index: 29;
    }
}

@media (max-width: 767px) {
    .board {
        padding: 10px;
        gap: 10px;
    }

    .column {
        height: 100%;
        max-height: 100%;
    }

    .nav-toggle {
        display: inline-flex;
        margin-left: auto;
    }

    .nav-actions {
        display: none;
        position: absolute;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        padding: 10px;
        z-index: 21;
    }

    .header.menu-open .nav-actions {
        display: flex;
    }

    .export-actions-bar {
        display: none;
    }

    .export-actions-menu {
        display: flex;
        width: 100%;
        flex-wrap: wrap;
    }

    .user-chip {
        max-width: none;
        width: 100%;
    }
}