* {
    box-sizing: border-box;
}

:root {
    --bg: #ffffff;
    --bg-subtle: #fafafa;
    --bg-hover: #f0f0f0;
    --border: #e8e8e8;
    --border-muted: #e0e0e0;
    --text: #111111;
    --text-2: #555555;
    --text-3: #999999;
    --text-4: #aaaaaa;
    --text-5: #bbbbbb;
    --text-6: #cccccc;
    --text-placeholder: #b8b8b8;
    --text-dim: #666666;
    --text-strong: #222222;
    --badge-bg: rgb(126, 126, 126);
    --overlay: rgba(0, 0, 0, 0.2);
    --code-bg: #f3f3f3;
    --pre-bg: #f5f5f5;
    --link: #0070f3;
    --toggle-active-bg: #111111;
    --toggle-active-text: #ffffff;
    --danger: #cc3333;
    --danger-bg: #fff0f0;
    --danger-border: #f0c0c0;
}

[data-theme="dark"] {
    --bg: #1a1a1a;
    --bg-subtle: #222222;
    --bg-hover: #2d2d2d;
    --border: #303030;
    --border-muted: #3a3a3a;
    --text: #e4e4e4;
    --text-2: #b0b0b0;
    --text-3: #787878;
    --text-4: #606060;
    --text-5: #4a4a4a;
    --text-6: #444444;
    --text-placeholder: #404040;
    --text-dim: #808080;
    --text-strong: #cccccc;
    --badge-bg: #666666;
    --overlay: rgba(0, 0, 0, 0.5);
    --code-bg: #252525;
    --pre-bg: #252525;
    --link: #58a6ff;
    --toggle-active-bg: #e4e4e4;
    --toggle-active-text: #111111;
    --danger: #e06060;
    --danger-bg: #2a1818;
    --danger-border: #5a3030;
}

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#tab-bar {
    display: flex;
    align-items: flex-end;
    padding: 0 8px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-subtle);
    gap: 2px;
    flex-shrink: 0;
    height: 40px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
}

#tab-bar::-webkit-scrollbar {
    display: none;
}

.tab {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 10px 0 12px;
    height: 32px;
    border: 1px solid transparent;
    border-bottom: none;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-3);
    white-space: nowrap;
    max-width: 180px;
    min-width: 80px;
    flex-shrink: 0;
    user-select: none;
    transition: color 0.1s;
}

.tab:hover {
    background: var(--bg-hover);
    color: var(--text-2);
}

.tab.active {
    background: var(--bg);
    border-color: var(--border);
    color: var(--text);
    margin-bottom: -1px;
}

.tab-title {
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
}

.tab-rename-input {
    background: transparent;
    border: none;
    outline: none;
    font: inherit;
    color: inherit;
    width: 100%;
    min-width: 0;
    padding: 0;
    caret-color: var(--text-2);
}

.tab-close {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
    color: transparent;
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
    transition: background 0.1s, color 0.1s;
}

.tab:hover .tab-close,
.tab.active .tab-close {
    color: var(--text-5);
}

.tab-close:hover {
    background: var(--border-muted);
    color: var(--text-2) !important;
}

#new-tab-btn {
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    cursor: pointer;
    color: var(--text-5);
    font-size: 20px;
    line-height: 1;
    flex-shrink: 0;
    margin-left: 2px;
    align-self: flex-end;
    margin-bottom: 3px;
    transition: background 0.1s, color 0.1s;
    user-select: none;
}

#new-tab-btn:hover {
    background: var(--bg-hover);
    color: var(--text-2);
}

#editor {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    background: transparent;
    appearance: none;
    -webkit-appearance: none;
    padding: 56px 64px;
    font-size: 20px;
    line-height: 1.7;
    color: var(--text);
    white-space: pre-wrap;
    overflow-wrap: break-word;
}

#editor::placeholder {
    color: var(--text-placeholder);
}

#trash-btn {
    margin-left: auto;
    position: relative;
    align-self: flex-end;
    margin-bottom: 3px;
    flex-shrink: 0;
    width: 28px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
    color: var(--text-4);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s, color 0.1s, border-color 0.1s;
    user-select: none;
    padding: 0;
}

#trash-btn:hover {
    background: var(--bg-hover);
    color: var(--text-2);
    border-color: var(--border-muted);
}

#import-btn,
#export-btn {
    margin-left: 4px;
    align-self: flex-end;
    margin-bottom: 3px;
    flex-shrink: 0;
    width: 28px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-4);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s, color 0.1s, border-color 0.1s;
    padding: 0;
}

#import-btn:hover,
#export-btn:hover {
    background: var(--bg-hover);
    color: var(--text-2);
    border-color: var(--border-muted);
}

#trash-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--badge-bg);
    color: #fff;
    font-size: 9px;
    font-weight: 700;
    line-height: 1;
    padding: 2px 4px;
    border-radius: 8px;
    min-width: 14px;
    text-align: center;
    pointer-events: none;
}

#theme-btn {
    margin-left: 4px;
    align-self: flex-end;
    margin-bottom: 3px;
    flex-shrink: 0;
    width: 28px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-4);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s, color 0.1s, border-color 0.1s;
    padding: 0;
}

#theme-btn:hover {
    background: var(--bg-hover);
    color: var(--text-2);
    border-color: var(--border-muted);
}

.theme-icon-sun { display: none; }
[data-theme="dark"] .theme-icon-sun { display: block; }
[data-theme="dark"] .theme-icon-moon { display: none; }

#preview-toggle {
    margin-left: 4px;
    margin-right: 4px;
    align-self: flex-end;
    margin-bottom: 3px;
    flex-shrink: 0;
    height: 26px;
    padding: 0 10px;
    font-size: 12px;
    font-family: inherit;
    color: var(--text-3);
    background: transparent;
    border: 1px solid var(--border-muted);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s, color 0.1s, border-color 0.1s;
    user-select: none;
}

#preview-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-2);
    border-color: var(--border-muted);
}

#preview-toggle.active {
    background: var(--toggle-active-bg);
    color: var(--toggle-active-text);
    border-color: var(--toggle-active-bg);
}

#preview {
    flex: 1;
    padding: 56px 64px;
    font-size: 20px;
    line-height: 1.7;
    color: var(--text);
    overflow-y: auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

#preview h1, #preview h2, #preview h3,
#preview h4, #preview h5, #preview h6 {
    margin: 1em 0 0.4em;
    line-height: 1.3;
    font-weight: 600;
}

#preview h1 { font-size: 1.8em; }
#preview h2 { font-size: 1.4em; }
#preview h3 { font-size: 1.15em; }

#preview p { margin: 0.6em 0; }

#preview a { color: var(--link); text-decoration: underline; }

#preview code {
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 0.85em;
    background: var(--code-bg);
    padding: 2px 5px;
    border-radius: 3px;
}

#preview pre {
    background: var(--pre-bg);
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
}

#preview pre code {
    background: none;
    padding: 0;
    font-size: 0.9em;
}

#preview blockquote {
    border-left: 3px solid var(--border-muted);
    margin: 0.8em 0;
    padding-left: 1em;
    color: var(--text-dim);
}

#preview ul, #preview ol {
    padding-left: 1.5em;
    margin: 0.6em 0;
}

#preview li { margin: 0.2em 0; }

#preview table {
    border-collapse: collapse;
    width: 100%;
    margin: 0.8em 0;
}

#preview th, #preview td {
    border: 1px solid var(--border-muted);
    padding: 6px 12px;
    text-align: left;
}

#preview th { background: var(--pre-bg); font-weight: 600; }

#preview hr {
    border: none;
    border-top: 1px solid var(--border-muted);
    margin: 1.5em 0;
}

#preview img { max-width: 100%; border-radius: 4px; }

#snippet-menu {
    position: fixed;
    z-index: 200;
    background: var(--bg);
    border: 1px solid var(--border-muted);
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    min-width: 200px;
    max-height: 280px;
    overflow-y: auto;
    font-size: 13px;
    font-family: inherit;
}

.snippet-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 12px;
    cursor: pointer;
    color: var(--text);
    transition: background 0.08s;
}

.snippet-item:hover,
.snippet-item.selected {
    background: var(--bg-hover);
}

.snippet-item .snippet-label {
    font-weight: 500;
    flex-shrink: 0;
}

.snippet-item .snippet-hint {
    color: var(--text-4);
    font-size: 11px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ── Trash modal ─────────────────────────────────────────────────────────── */

#trash-modal {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
}

#trash-modal[hidden] {
    display: none;
}

.trash-overlay {
    position: absolute;
    inset: 0;
    background: var(--overlay);
}

.trash-panel {
    position: relative;
    background: var(--bg);
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.14);
    width: 480px;
    max-width: calc(100vw - 32px);
    max-height: 70vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.trash-header {
    display: flex;
    align-items: center;
    padding: 16px 20px 14px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.trash-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    flex: 1;
}

.trash-close-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-5);
    font-size: 18px;
    border-radius: 4px;
    padding: 0;
    font-family: inherit;
    transition: background 0.1s, color 0.1s;
}

.trash-close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-2);
}

.trash-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px 0;
}

.trash-empty-msg {
    text-align: center;
    color: var(--text-6);
    font-size: 13px;
    padding: 36px 0;
    margin: 0;
}

.trash-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 20px;
    transition: background 0.08s;
}

.trash-item:hover {
    background: var(--bg-subtle);
}

.trash-item-info {
    flex: 1;
    min-width: 0;
}

.trash-item-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-strong);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.trash-item-preview {
    font-size: 12px;
    color: var(--text-5);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}

.trash-item-date {
    font-size: 11px;
    color: var(--text-6);
    margin-top: 3px;
}

.trash-item-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.trash-restore-btn {
    padding: 4px 10px;
    font-size: 12px;
    font-family: inherit;
    color: var(--text-2);
    background: transparent;
    border: 1px solid var(--border-muted);
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.1s, border-color 0.1s;
}

.trash-restore-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-muted);
}

.trash-delete-btn {
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-family: inherit;
    color: var(--text-6);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    transition: background 0.1s, color 0.1s, border-color 0.1s;
}

.trash-delete-btn:hover {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: var(--danger-border);
}

.trash-footer {
    border-top: 1px solid var(--border);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-shrink: 0;
}

.trash-confirm-label {
    font-size: 12px;
    color: var(--text-3);
    margin-right: auto;
}

.trash-empty-all-btn {
    padding: 5px 12px;
    font-size: 12px;
    font-family: inherit;
    color: var(--danger);
    background: transparent;
    border: 1px solid var(--danger-border);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s, border-color 0.1s;
}

.trash-empty-all-btn:hover,
.trash-empty-all-btn--confirm:hover {
    background: var(--danger-bg);
    border-color: var(--danger-border);
}

.trash-delete-btn--confirm {
    width: auto;
    padding: 0 10px;
    color: var(--danger);
    border-color: var(--danger-border);
    background: var(--danger-bg);
    font-size: 12px;
}

.trash-delete-btn--confirm:hover {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: var(--danger-border);
}

@media (max-width: 768px) {
    #editor, #preview {
        padding: 32px 24px;
        font-size: 18px;
        line-height: 1.6;
    }
}