* {
    box-sizing: border-box;
}

body {
    --accent: #6b7280;
    --accent-soft: #f3f4f6;
    --accent-border: #e5e7eb;
    --link-color: #111827;
    margin: 0;
    background: #ffffff;
    color: #111827;
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.app-shell {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 100vh;
    visibility: hidden;
}

.app-shell.ready {
    visibility: visible;
}

.pane {
    min-width: 0;
    height: 100vh;
    overflow-y: auto;
}

.pane-editor {
    border-right: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
}

#markdown-input {
    width: 100%;
    height: 100vh;
    padding: 64px 40px 40px;
    border: none;
    resize: none;
    outline: none;
    background: transparent;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 16px;
    line-height: 1.6;
    color: #111827;
}

.preview-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 64px 20px 80px;
    font-size: 16px;
    line-height: 1.72;
}

.pane-preview .preview-content {
    padding-right: 20px;
}

.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4 {
    margin: 36px 0 18px;
    font-weight: 650;
}

.preview-content h1 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.2;
    overflow-wrap: anywhere;
}

.preview-content h2 {
    font-size: 24px;
    line-height: 1.25;
}

.preview-content h3 {
    font-size: 20px;
    line-height: 1.3;
}

.preview-content h4 {
    font-size: 18px;
    line-height: 1.35;
}

.preview-content > :first-child {
    margin-top: 0;
}

.preview-content p,
.preview-content li {
    font-size: 17px;
    margin: 0 0 16px;
}

.preview-content ul,
.preview-content ol {
    margin: 0 0 20px;
    padding-left: 1.5rem;
}

.preview-content a {
    color: var(--link-color);
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.25em;
}

.preview-content .sheet-back-link {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1000;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin: 0;
    color: var(--accent);
    text-decoration: none;
    border-radius: 999px;
}

.preview-content .sheet-back-link:hover {
    background: var(--accent-soft);
    color: #111827;
    text-decoration: none;
}

.preview-content blockquote {
    margin: 24px 0;
    padding: 0 0 0 16px;
    border-left: 3px solid var(--accent-border);
    color: #4b5563;
}

.preview-content blockquote p {
    margin-bottom: 0;
}

/* Inline code only */
.preview-content code:not(pre code) {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.92em;
    background: var(--accent-soft);
    color: #111827;
    border-radius: 5px;
    padding: 0.2em 0.4em;
}

/* Code block container */
.preview-content pre {
    background: #f9fafb;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    padding: 1.25rem;
    margin: 1.5rem 0;
    overflow-x: auto;
}

/* Code inside blocks */
.preview-content pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
    color: inherit;
    font-size: 0.9em;
    line-height: 1.6;
}

.table-scroll {
    width: 100%;
    margin: 24px 0;
    overflow-x: auto;
    border: 1px solid var(--accent-border);
    border-radius: 10px;
}

.preview-content table {
    width: 100%;
    min-width: max-content;
    border-collapse: separate;
    border-spacing: 0;
    margin: 0;
    border: 0;
    font-size: 15px;
}

.preview-content table code {
    word-break: break-word;
}

.preview-content th,
.preview-content td {
    padding: 10px 12px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
}

.preview-content th {
    background: var(--accent-soft);
    font-weight: 650;
}

.preview-content th:first-child,
.preview-content td:first-child {
    border-left: none;
}

.preview-content th:last-child,
.preview-content td:last-child {
    border-right: none;
}

.preview-content tr:last-child td {
    border-bottom: none;
}

.preview-content img {
    border-radius: 12px;
    margin: 20px 0;
    max-width: 100%;
    height: auto;
    display: block;
}

.preview-content hr {
    border: 0;
    border-top: 1px solid var(--accent-border);
    margin: 36px 0;
}

.sheet-converter {
    margin: 28px 0;
    padding: 16px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    background: var(--accent-soft);
}

.sheet-converter label {
    display: block;
    margin: 0 0 8px;
    font-size: 14px;
    font-weight: 650;
}

.sheet-converter input {
    width: 100%;
    min-height: 44px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    padding: 10px 12px;
    font: inherit;
    color: #111827;
    background: #ffffff;
}

.sheet-converter input:focus {
    outline: 2px solid #111827;
    outline-offset: 2px;
}

.sheet-converter-result {
    margin-top: 12px;
    font-size: 15px;
}

.sheet-converter-result a {
    overflow-wrap: anywhere;
}

.sheet-converter-error {
    color: #111827;
}

.primary-action-btn {
    position: fixed;
    bottom: 16px;
    right: 16px;
    z-index: 1000;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 999px;
    padding: 0;
    background: transparent;
    color: #6b7280;
    cursor: pointer;
    display: none;
}

.primary-action-btn:hover {
    background: #f3f4f6;
    color: #111827;
}

.primary-action-btn:disabled {
    background: transparent;
    color: #9ca3af;
    cursor: default;
}

.primary-action-btn:focus-visible {
    outline: 2px solid #111827;
    outline-offset: 2px;
}

body.editor-mode .primary-action-btn,
body.published-page-mode .primary-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

body.home-mode .primary-action-btn,
body.sheet-mode .primary-action-btn {
    display: none;
}

.primary-action-btn svg {
    width: 18px;
    height: 18px;
}

.action-tooltip {
    position: fixed;
    right: 68px;
    bottom: 25px;
    z-index: 1001;
    max-width: 160px;
    padding: 7px 11px;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.98);
    color: #111827;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.2;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transform: translateX(4px);
    box-shadow: 0 10px 28px rgba(17, 24, 39, 0.12);
    transition: opacity 90ms ease 2s, transform 90ms ease 2s;
}

.primary-action-btn:hover + .action-tooltip,
.primary-action-btn:focus-visible + .action-tooltip {
    opacity: 1;
    transform: translateX(0);
}

.primary-action-btn:disabled + .action-tooltip,
body.sheet-mode .action-tooltip,
body:not(.editor-mode):not(.published-page-mode) .action-tooltip {
    display: none;
}

.scroll-top-btn {
    position: fixed;
    left: 50%;
    bottom: 18px;
    z-index: 1000;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 999px;
    padding: 0;
    background: transparent;
    color: #6b7280;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 8px);
    transition: opacity 160ms ease, transform 160ms ease, background 160ms ease, color 160ms ease;
}

.scroll-top-btn.show {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
}

.scroll-top-btn:hover {
    background: #f3f4f6;
    color: #111827;
}

.scroll-top-btn:focus-visible {
    outline: 2px solid #111827;
    outline-offset: 2px;
}

.scroll-top-btn svg {
    width: 18px;
    height: 18px;
}

.menu-wrap {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 1000;
}

.menu-btn {
    background: transparent;
    color: #6b7280;
    border: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 999px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.menu-btn:hover {
    background: #f3f4f6;
    color: #111827;
}

.menu-btn:focus-visible {
    outline: 2px solid #111827;
    outline-offset: 2px;
}

.menu-btn svg {
    width: 18px;
    height: 18px;
}

.menu-tooltip {
    position: absolute;
    top: 7px;
    right: calc(100% + 8px);
    z-index: 1001;
    padding: 7px 11px;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.98);
    color: #111827;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.2;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transform: translateX(4px);
    box-shadow: 0 10px 28px rgba(17, 24, 39, 0.12);
    transition: opacity 90ms ease 2s, transform 90ms ease 2s;
}

.menu-btn:hover + .menu-tooltip,
.menu-btn:focus-visible + .menu-tooltip {
    opacity: 1;
    transform: translateX(0);
}

.menu-btn[aria-expanded="true"] + .menu-tooltip {
    display: none;
}

.menu-panel {
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 18px 45px rgba(17, 24, 39, 0.14);
    padding: 8px;
    display: none;
}

.menu-panel.open {
    display: block;
}

.toast {
    position: fixed;
    right: 16px;
    bottom: 68px;
    z-index: 1100;
    max-width: min(280px, calc(100vw - 32px));
    padding: 10px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.96);
    color: #4b5563;
    font-size: 14px;
    box-shadow: 0 12px 32px rgba(17, 24, 39, 0.12);
    opacity: 0;
    transform: translateY(6px);
    pointer-events: none;
    transition: opacity 160ms ease, transform 160ms ease;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.menu-item {
    width: 100%;
    border: none;
    background: transparent;
    color: #111827;
    text-align: left;
    min-height: 44px;
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
}

.menu-item:hover {
    background: #f9fafb;
}

.menu-item:focus-visible {
    outline: none;
    background: #f3f4f6;
}

.color-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.color-toggle::after {
    content: "";
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    opacity: 0.55;
    transform: rotate(45deg) translateY(-2px);
    transform-origin: center;
}

.color-toggle[aria-expanded="true"]::after {
    transform: rotate(225deg) translate(-1px, -1px);
}

.color-options {
    display: none;
    margin: 2px 0 6px 12px;
    padding: 4px 0 4px 10px;
    border-left: 1px solid var(--accent-border);
}

.color-options.open {
    display: block;
}

.color-option {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 40px;
    padding: 10px 12px;
    color: #374151;
}

.color-swatch {
    width: 14px;
    height: 14px;
    border: 1px solid var(--accent-border);
    border-radius: 999px;
    background: var(--swatch);
    flex: 0 0 auto;
}

.color-option[aria-current="true"] {
    background: var(--accent-soft);
    color: #111827;
}

.menu-item[disabled] {
    color: #9ca3af;
    cursor: default;
}

.menu-item[disabled]:hover {
    background: transparent;
}

body.publish-mode .pane-editor {
    display: none;
}

body.publish-mode .app-shell {
    grid-template-columns: 1fr;
}

@media (max-width: 900px) {
    .preview-content .sheet-back-link {
        top: max(16px, env(safe-area-inset-top));
        left: max(8px, env(safe-area-inset-left));
        width: 48px;
        height: 48px;
    }

    .primary-action-btn {
        top: auto;
        right: max(16px, env(safe-area-inset-right));
        bottom: max(16px, env(safe-area-inset-bottom));
        width: 48px;
        height: 48px;
    }

    .action-tooltip {
        display: none;
    }

    .scroll-top-btn {
        bottom: max(16px, env(safe-area-inset-bottom));
        width: 48px;
        height: 48px;
    }

    .app-shell {
        grid-template-columns: 1fr;
    }

    .pane-editor {
        border-right: none;
        border-bottom: none;
        height: 100vh;
    }

    #markdown-input {
        height: 100%;
        padding: 20px;
    }

    .pane-preview {
        display: none;
    }

    body.publish-mode .pane-preview {
        display: block;
    }

    body.publish-mode .pane-editor {
        display: none;
    }

    .preview-content {
        padding-top: 20px;
        padding-right: 20px;
        padding-bottom: 104px;
    }

    .menu-wrap {
        top: max(8px, env(safe-area-inset-top));
        right: max(16px, env(safe-area-inset-right));
        bottom: auto;
    }

    .menu-btn {
        width: 48px;
        height: 40px;
    }

    .menu-tooltip {
        display: none;
    }

    .menu-panel {
        top: calc(100% + 10px);
        bottom: auto;
        width: min(240px, calc(100vw - 32px));
    }

    .toast {
        right: max(16px, env(safe-area-inset-right));
        bottom: calc(max(16px, env(safe-area-inset-bottom)) + 60px);
    }
}