:root {
    --color-surface-base: #FFF8F0;
    --color-surface-raised: #FFFFFF;
    --color-ink-primary: #2D2A26;
    --color-ink-secondary: #7A7368;
    --color-ink-disabled: #BDB6AB;
    --color-accent-green: #3A9A5B;
    --color-accent-orange: #E87B35;
    --color-accent-orange-light: #FFF0E5;
    --color-accent-green-light: #E8F5EC;
    --color-border-hairline: #E8E2D9;
    --color-danger: #D44040;
    --font-family: system-ui, -apple-system, sans-serif;
    --font-size-title: 22px;
    --font-size-body: 16px;
    --font-size-meta: 13px;
    --rounded-sm: 8px;
    --rounded-md: 14px;
    --rounded-lg: 20px;
    --rounded-full: 9999px;
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-5: 24px;
    --spacing-6: 32px;
    --spacing-7: 48px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    color: var(--color-ink-primary);
    background-color: var(--color-surface-base);
    min-height: 100dvh;
    padding-bottom: 72px;
    -webkit-tap-highlight-color: transparent;
}

/* ---- Login ---- */

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-bottom: 0;
}

.login-container {
    width: 100%;
    max-width: 320px;
    padding: var(--spacing-4);
    text-align: center;
}

.login-title {
    font-size: var(--font-size-title);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
}

.login-input {
    display: block;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    border: 1px solid var(--color-border-hairline);
    border-radius: var(--rounded-sm);
    background: var(--color-surface-raised);
    outline: none;
}

.login-input:focus {
    border-color: var(--color-accent-orange);
}

.login-error {
    color: var(--color-danger);
    font-size: var(--font-size-meta);
    margin-top: var(--spacing-2);
}

.login-button {
    display: block;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    margin-top: var(--spacing-4);
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    font-weight: 500;
    color: #FFFFFF;
    background: var(--color-accent-orange);
    border: none;
    border-radius: var(--rounded-sm);
    cursor: pointer;
    min-height: 44px;
}

/* ---- App Header ---- */

.app-header {
    padding: var(--spacing-5) var(--spacing-4) var(--spacing-3);
}

.app-title {
    font-size: var(--font-size-title);
    font-weight: 700;
}

.header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.complete-all-btn {
    font-size: var(--font-size-meta);
    font-family: var(--font-family);
    color: var(--color-ink-secondary);
    background: none;
    border: 1px solid var(--color-border-hairline);
    border-radius: var(--rounded-sm);
    padding: var(--spacing-1) var(--spacing-3);
    cursor: pointer;
    min-height: 32px;
}

.complete-all-btn:hover {
    background: var(--color-accent-green-light);
    border-color: var(--color-accent-green);
    color: var(--color-ink-primary);
}

.complete-all-btn:focus-visible {
    outline: 2px solid var(--color-accent-green);
    outline-offset: 2px;
}

/* ---- Todo List ---- */

.todo-main {
    padding: 0 var(--spacing-4);
}

.empty-state {
    color: var(--color-ink-secondary);
    padding: var(--spacing-7) 0;
    text-align: center;
}

.todo-row {
    display: flex;
    align-items: center;
    min-height: 56px;
    padding: var(--spacing-3) 0;
    border-bottom: 1px solid var(--color-border-hairline);
    gap: var(--spacing-2);
}

.todo-row.dragging {
    opacity: 0.5;
}

.todo-row.drag-over {
    border-top: 2px solid var(--color-accent-green);
}

/* ---- Checkbox ---- */

.todo-checkbox {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.checkbox-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border-hairline);
    border-radius: var(--rounded-sm);
    transition: background-color 0.05s, border-color 0.05s;
}

.checkbox-icon.checked {
    background: var(--color-accent-green);
    border-color: var(--color-accent-green);
}

.checkbox-icon.checked::after {
    content: '';
    display: block;
    width: 6px;
    height: 12px;
    border: solid #FFFFFF;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg) translateY(-1px);
}

/* ---- Todo Text ---- */

.todo-text {
    flex: 1;
    min-width: 0;
    word-break: break-word;
    line-height: 1.4;
}

.done-text {
    text-decoration: line-through;
    color: var(--color-ink-disabled);
}

.todo-edit-input {
    flex: 1;
    min-width: 0;
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    padding: var(--spacing-1) var(--spacing-2);
    border: 1px solid var(--color-accent-green);
    border-radius: var(--rounded-sm);
    outline: none;
    background: var(--color-surface-raised);
}

/* ---- Move to Tomorrow ---- */

.todo-move {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--color-danger);
}

.move-icon::after {
    content: '→';
    font-size: 18px;
}

/* ---- Drag Handle ---- */

.drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    color: var(--color-ink-disabled);
    cursor: grab;
    font-size: 20px;
    user-select: none;
    touch-action: none;
}

.drag-handle:active {
    cursor: grabbing;
}

/* ---- Completed Section ---- */

.completed-section {
    margin-top: var(--spacing-4);
}

.completed-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-accent-green-light);
    border: none;
    border-radius: var(--rounded-sm);
    cursor: pointer;
    font-size: var(--font-size-meta);
    font-weight: 500;
    font-family: var(--font-family);
    color: var(--color-ink-secondary);
    min-height: 44px;
}

.completed-chevron::after {
    content: '▸';
    font-size: 14px;
    transition: transform 0.1s;
    display: inline-block;
}

.completed-header[aria-expanded="true"] .completed-chevron::after {
    transform: rotate(90deg);
}

.completed-list {
    margin-top: var(--spacing-1);
}

.todo-done {
    opacity: 0.7;
}

/* ---- FAB ---- */

.fab {
    position: fixed;
    bottom: 80px;
    right: var(--spacing-4);
    width: 56px;
    height: 56px;
    border-radius: var(--rounded-full);
    background: var(--color-accent-orange);
    color: #FFFFFF;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab-icon {
    font-size: 28px;
    font-weight: 300;
    line-height: 1;
}

/* ---- Paste Input ---- */

.paste-input-area {
    margin-top: var(--spacing-4);
    padding: var(--spacing-4);
    background: var(--color-accent-orange-light);
    border-radius: var(--rounded-md);
}

.paste-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.date-toggle {
    display: flex;
    gap: 0;
    border-radius: var(--rounded-sm);
    overflow: hidden;
    border: 1px solid var(--color-border-hairline);
}

.date-toggle-btn {
    flex: 1;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-meta);
    font-weight: 500;
    font-family: var(--font-family);
    border: none;
    cursor: pointer;
    background: var(--color-surface-raised);
    color: var(--color-ink-secondary);
    min-height: 36px;
}

.date-toggle-btn.active {
    background: var(--color-accent-orange);
    color: #FFFFFF;
}

.paste-textarea {
    width: 100%;
    padding: var(--spacing-3);
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    border: 1px solid var(--color-border-hairline);
    border-radius: var(--rounded-sm);
    background: var(--color-surface-raised);
    resize: vertical;
    outline: none;
    min-height: 120px;
}

.paste-textarea:focus {
    border-color: var(--color-accent-orange);
}

.paste-submit {
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    font-weight: 500;
    color: #FFFFFF;
    background: var(--color-accent-orange);
    border: none;
    border-radius: var(--rounded-sm);
    cursor: pointer;
    min-height: 44px;
}

/* ---- Tab Bar ---- */

.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    display: flex;
    background: var(--color-surface-raised);
    border-top: 1px solid var(--color-border-hairline);
    z-index: 20;
}

.tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-1);
    text-decoration: none;
    color: var(--color-ink-secondary);
    font-size: var(--font-size-meta);
    min-height: 44px;
}

.tab.active {
    color: var(--color-accent-green);
}

.tab-icon {
    display: block;
    width: 20px;
    height: 20px;
}

.tab-icon-today::after {
    content: '☀';
    font-size: 18px;
}

.tab-icon-tomorrow::after {
    content: '☾';
    font-size: 18px;
}

/* ---- Confirm Dialog ---- */

.confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.confirm-dialog {
    background: var(--color-surface-raised);
    border-radius: var(--rounded-md);
    padding: var(--spacing-5);
    max-width: 280px;
    width: 90%;
    text-align: center;
}

.confirm-dialog p {
    margin-bottom: var(--spacing-5);
    font-size: var(--font-size-body);
}

.confirm-actions {
    display: flex;
    gap: var(--spacing-3);
}

.confirm-actions button {
    flex: 1;
    padding: var(--spacing-3);
    font-size: var(--font-size-body);
    font-family: var(--font-family);
    font-weight: 500;
    border: none;
    border-radius: var(--rounded-sm);
    cursor: pointer;
    min-height: 44px;
}

.btn-cancel {
    background: var(--color-border-hairline);
    color: var(--color-ink-primary);
}

.btn-confirm {
    background: var(--color-danger);
    color: #FFFFFF;
}

/* ---- Desktop ---- */

@media (min-width: 481px) {
    .todo-main {
        max-width: 640px;
        margin: 0 auto;
    }

    .app-header {
        max-width: 640px;
        margin: 0 auto;
    }

    .tab-bar {
        position: static;
        max-width: 640px;
        margin: 0 auto;
        border-top: none;
        border-bottom: 1px solid var(--color-border-hairline);
    }

    body {
        padding-bottom: 0;
    }

    .fab {
        bottom: var(--spacing-5);
    }
}