:root {
    color-scheme: light;

    --color-text: #252525;
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-field: #FFFFFF;
    --color-muted: #737373;
    --color-danger: #C2413A;
    --color-danger-contrast: #FFFFFF;
    --color-danger-soft: rgb(194 65 58 / 0.1);
    --terminal-bg: #f5f6f8;
    --terminal-text: #111827;
    --terminal-text-subtle: rgb(0 0 0 / 0.45);
    --terminal-placeholder: rgb(0 0 0 / 0.45);
    --terminal-prompt: #16a34a;
    --terminal-success: #111827;
    --terminal-error: #dc2626;
    --terminal-border: rgb(0 0 0 / 0.12);
    --terminal-scroll-thumb: rgb(0 0 0 / 0.18);
    --terminal-controls: rgb(0 0 0 / 0.55);
    --terminal-color-scheme: light;

    --radius: 0.75rem;
    --transition: 150ms;
}

:root[data-theme="dark"] {
    color-scheme: dark;

    --color-text: #F2F2F0;
    --color-bg: #111314;
    --color-surface: #1A1D1F;
    --color-field: #141719;
    --color-muted: #A3A3A3;
    --color-danger: #F08075;
    --color-danger-contrast: #201716;
    --color-danger-soft: rgb(240 128 117 / 0.12);
    --terminal-bg: #101214;
    --terminal-text: #d7f9df;
    --terminal-text-subtle: rgb(255 255 255 / 0.45);
    --terminal-placeholder: rgb(255 255 255 / 0.35);
    --terminal-prompt: #8be28b;
    --terminal-success: #d7f9df;
    --terminal-error: #ff9b92;
    --terminal-border: rgb(255 255 255 / 0.1);
    --terminal-scroll-thumb: rgb(255 255 255 / 0.18);
    --terminal-controls: rgb(255 255 255 / 0.55);
    --terminal-color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
:root:not([data-theme="light"]) {
        color-scheme: dark;

        --color-text: #F2F2F0;
        --color-bg: #111314;
        --color-surface: #1A1D1F;
        --color-field: #141719;
        --color-muted: #A3A3A3;
        --color-danger: #F08075;
        --color-danger-contrast: #201716;
        --color-danger-soft: rgb(240 128 117 / 0.12);
        --terminal-bg: #101214;
        --terminal-text: #d7f9df;
        --terminal-text-subtle: rgb(255 255 255 / 0.45);
        --terminal-placeholder: rgb(255 255 255 / 0.35);
        --terminal-prompt: #8be28b;
        --terminal-success: #d7f9df;
        --terminal-error: #ff9b92;
        --terminal-border: rgb(255 255 255 / 0.1);
        --terminal-scroll-thumb: rgb(255 255 255 / 0.18);
        --terminal-controls: rgb(255 255 255 / 0.55);
        --terminal-color-scheme: dark;
    }
}

html {
    background-color: var(--color-bg);
}

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

body {
    transition:
        background-color var(--transition) ease,
        color var(--transition) ease;
}

.home-panel-scroll {
    /* スマホでは横スワイプUIとして使うが、下部スクロールバーは見せない。 */
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.home-panel-scroll::-webkit-scrollbar {
    display: none;
}

.home-panel-tabs {
    /* タブの選択背景を独立レイヤー化し、横スクロール時の残像を抑える。 */
    contain: paint;
    isolation: isolate;
    overflow: hidden;
    position: relative;
    transform: translateZ(0);
}

.home-panel-tabs::before {
    /* 選択中タブの背景は1枚だけをスライドさせ、ボタン背景の塗り替えを減らす。 */
    background-color: var(--color-text);
    border-radius: 9999px;
    content: "";
    inset-block: 0.25rem;
    inset-inline-start: 0.25rem;
    position: absolute;
    transform: translate3d(calc(var(--home-panel-tab-index, 0) * 100%), 0, 0);
    transition: transform 160ms ease;
    width: calc((100% - 0.5rem) / 2);
    will-change: transform;
    z-index: 0;
}

.home-panel-tab {
    color: color-mix(in srgb, var(--color-text) 58%, transparent);
    position: relative;
    transform: translateZ(0);
    z-index: 1;
}

.home-panel-tab.is-active {
    color: var(--color-bg);
}

.home-panel-tab:not(.is-active):hover {
    color: var(--color-text);
}

.tutorial-step {
    /* チュートリアルのステップ切り替え時に、方向つきで軽くスライド表示する。 */
    opacity: 0;
    transform: translate3d(1rem, 0, 0);
    transition:
        opacity 180ms ease,
        transform 220ms cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.tutorial-step[data-direction="backward"] {
    transform: translate3d(-1rem, 0, 0);
}

.tutorial-step.is-visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

input,
select,
textarea {
    background-color: var(--color-field);
    box-sizing: border-box;
    color: var(--color-text);
    max-width: 100%;
    min-width: 0;
}

input::placeholder {
    color: var(--color-muted);
}

.terminal-shell {
    block-size: clamp(28rem, 72dvh, calc(100dvh - 12rem));
    background-color: var(--terminal-bg);
    color: var(--terminal-text);
    color-scheme: var(--terminal-color-scheme);
    min-block-size: 0;
    transition: background-color var(--transition) ease, color var(--transition) ease;
    border: 0;
}

.terminal-output {
    min-block-size: 0;
    color: var(--terminal-text);
    scrollbar-color: var(--terminal-scroll-thumb) transparent;
}

.terminal-titlebar {
    border-bottom-color: var(--terminal-border);
}

.terminal-line {
    white-space: pre-wrap;
}

.terminal-input {
    background: transparent;
    color: var(--terminal-text);
}

.terminal-input::placeholder {
    color: var(--terminal-placeholder);
}

.terminal-shell-label {
    color: var(--terminal-text-subtle);
}

.terminal-accent {
    color: var(--terminal-prompt);
}

.terminal-success {
    color: var(--terminal-success);
}

.terminal-error {
    color: var(--terminal-error);
}

.terminal-titlebar[data-platform="windows"] {
    justify-content: space-between;
}

.terminal-titlebar[data-platform="windows"] .terminal-window-controls {
    margin-left: auto;
    order: 2;
}

.terminal-window-controls {
    display: flex;
    gap: 0.5rem;
}

.terminal-traffic-light {
    block-size: 0.75rem;
    border-radius: 9999px;
    inline-size: 0.75rem;
}

.terminal-window-button {
    align-items: center;
    border-radius: 0.25rem;
    color: var(--terminal-controls);
    display: inline-flex;
    block-size: 1rem;
    inline-size: 1rem;
    justify-content: center;
}

.terminal-window-button svg {
    block-size: 0.75rem;
    fill: none;
    inline-size: 0.75rem;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.5;
}

.terminal-window-close {
    color: var(--terminal-error);
}

.custom-native-control {
    block-size: 1px;
    inline-size: 1px;
    opacity: 0;
    pointer-events: none;
    position: absolute;
}

.custom-select {
    inline-size: max-content;
}

.custom-select.w-full,
.custom-date.w-full {
    inline-size: 100%;
}

.custom-select-button,
.custom-date-input {
    -webkit-appearance: none;
    appearance: none;
    box-sizing: border-box;
    inline-size: 100%;
    max-inline-size: 100%;
    min-inline-size: 0;
    transition:
        border-color var(--transition) ease,
        background-color var(--transition) ease;
}

.custom-select-button:focus-visible,
.custom-date-input:focus {
    border-color: var(--color-text);
    outline: none;
}

.custom-select-menu,
.custom-date-menu {
    box-shadow: 0 18px 40px rgb(0 0 0 / 0.14);
}

.custom-date-day.is-selected {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.project-card,
.project-card *,
.overflow-project-card,
.overflow-project-card * {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    touch-action: manipulation;
    user-select: none;
}

.modal-content {
    /* PCでは最大幅を固定し、スマホでは画面幅内に収める。 */
    inline-size: min(100%, calc(100vw - 2rem));
    max-block-size: calc(100dvh - 2rem);
    max-inline-size: 28rem;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

.modal-content.max-w-lg {
    max-inline-size: 32rem;
}

.modal-content.max-w-xl {
    max-inline-size: 36rem;
}

.modal-content.max-w-4xl {
    max-inline-size: 56rem;
}

.modal-content input[type="date"] {
    -webkit-appearance: none;
    appearance: none;
    display: block;
    inline-size: 100%;
    max-inline-size: 100%;
    min-inline-size: 0;
    width: 100%;
}

.modal-content input[type="date"]::-webkit-date-and-time-value {
    min-inline-size: 0;
    text-align: left;
}

.modal-content input[type="date"]::-webkit-calendar-picker-indicator {
    flex-shrink: 0;
    margin-left: 0.25rem;
}

@keyframes modal-overlay-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes modal-overlay-out {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

@keyframes modal-content-in {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(0.5rem);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes modal-content-out {
    from {
        opacity: 1;
        transform: scale(1) translateY(0);
    }

    to {
        opacity: 0;
        transform: scale(0.96) translateY(0.5rem);
    }
}

@keyframes undo-toast-in {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(0.75rem) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

@keyframes undo-toast-out {
    from {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }

    to {
        opacity: 0;
        transform: translateX(-50%) translateY(0.75rem) scale(0.98);
    }
}

.modal-overlay {
    animation: modal-overlay-in 180ms ease-out both;
}

.modal-content {
    animation: modal-content-in 180ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.modal-overlay.is-closing {
    animation: modal-overlay-out 150ms ease-in both;
    pointer-events: none;
}

.modal-overlay.is-closing .modal-content {
    animation: modal-content-out 150ms ease-in both;
}

.undo-toast {
    animation: undo-toast-in 180ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.undo-toast.is-closing {
    animation: undo-toast-out 160ms ease-in both;
    pointer-events: none;
}

/* プロジェクト一覧のミートボールメニューは、表示・非表示を滑らかに切り替える。 */
.data-menu,
.task-menu,
.project-context-menu {
    opacity: 0;
    transform: translateY(-0.25rem) scale(0.98);
    transform-origin: top right;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity 140ms ease,
        transform 140ms ease,
        visibility 0s linear 140ms;
}

.data-menu.is-open,
.task-menu.is-open,
.project-context-menu.is-open {
    opacity: 1;
    transform: translateY(0) scale(1);
    visibility: visible;
    pointer-events: auto;
    transition:
        opacity 140ms ease,
        transform 140ms ease;
}

.task-row[draggable="true"] {
    cursor: grab;
}

.task-row.is-dragging {
    opacity: 0.45;
}

.task-row.is-drop-target {
    outline: 2px solid color-mix(in srgb, var(--color-text) 35%, transparent);
    outline-offset: -2px;
}

.deadline-settings {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    transition:
        grid-template-rows 180ms ease,
        opacity 150ms ease;
}

.deadline-settings.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
}

.deadline-settings-content {
    min-height: 0;
    overflow: hidden;
}

.deadline-probability-label {
    display: grid;
    grid-template-columns: 0fr;
    margin-right: 0;
    min-width: 0;
    opacity: 0;
    transform: translateX(0.25rem);
    transition:
        grid-template-columns 180ms ease,
        margin-right 180ms ease,
        opacity 150ms ease,
        transform 180ms ease;
}

.deadline-probability-label.is-visible {
    grid-template-columns: 1fr;
    margin-right: 0.75rem;
    opacity: 1;
    transform: translateX(0);
}

.deadline-probability-label-content {
    overflow: hidden;
    white-space: nowrap;
}

.deadline-probability-marker {
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -50%) scale(0.65);
    transition:
        opacity 150ms ease,
        transform 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.deadline-probability-marker.is-visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

@media (prefers-reduced-motion: reduce) {
    .modal-overlay,
    .modal-content,
    .undo-toast,
    .data-menu,
    .task-menu,
    .project-context-menu,
    .tutorial-step,
    .deadline-settings,
    .deadline-probability-label,
    .deadline-probability-marker {
        animation-duration: 1ms;
        transition-duration: 1ms;
    }
}