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

:root {
    --bg-page: #f0f2f5;
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --border-color: rgba(255, 255, 255, 0.4);
    --input-bg: rgba(255, 255, 255, 0.4);
    --item-bg: rgba(255, 255, 255, 0.3);
    --item-border: rgba(255, 255, 255, 0.5);
    --header-bg: rgba(255, 255, 255, 0.5);
    --header-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    --footer-color: #8e8e93;
    --editor-bg: rgba(255, 255, 255, 0.3);
    --editor-focus-bg: rgba(255, 255, 255, 0.1);
    --editor-color: #1d1d1f;
    --btn-bg: rgba(255, 255, 255, 0.3);
    --btn-hover: rgba(255, 255, 255, 0.5);
    --btn-active: rgba(0, 122, 255, 0.1);
    --btn-border: rgba(255, 255, 255, 0.3);
    --apple-blue: #007aff;
    --apple-blue-dark: #0a84ff;
    --apple-bg-secondary: #f5f5f7;
    --apple-text-primary: #1d1d1f;
    --apple-text-secondary: #6e6e73;
}

body.dark {
    --bg-page: #121212;
    --glass-bg: rgba(30, 30, 30, 0.35);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --text-primary: #f5f5f7;
    --text-secondary: #8e8e93;
    --border-color: rgba(255, 255, 255, 0.12);
    --input-bg: rgba(255, 255, 255, 0.06);
    --item-bg: rgba(255, 255, 255, 0.04);
    --item-border: rgba(255, 255, 255, 0.08);
    --header-bg: rgba(30, 30, 30, 0.6);
    --header-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    --footer-color: #6e6e73;
    --editor-bg: rgba(255, 255, 255, 0.04);
    --editor-focus-bg: rgba(0, 0, 0, 0.2);
    --editor-color: #f5f5f7;
    --btn-bg: rgba(255, 255, 255, 0.04);
    --btn-hover: rgba(255, 255, 255, 0.08);
    --btn-active: rgba(10, 132, 255, 0.2);
    --btn-border: rgba(255, 255, 255, 0.06);
    --apple-bg-secondary: #1c1c1e;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-page);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 0;
    margin: 0;
    transition: background 0.4s, color 0.4s;
    background-image: url('https://img.fastmirror.net/s/2026/07/29/6a6a10f3a0056.jpg'), linear-gradient(135deg, #a8c0ff 0%, #3f2b96 100%);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

#appHeader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--header-shadow);
    transition: transform 0.3s ease, opacity 0.3s ease, background 0.4s, box-shadow 0.4s;
    transform: translateY(0);
    opacity: 1;
    border-bottom: 1px solid var(--glass-border);
}

#appHeader.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

.header-left .app-title {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.header-left .app-title i {
    color: var(--apple-blue);
}

.header-right {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.icon-btn {
    background: transparent;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 8px;
    transition: background 0.2s, color 0.2s;
    color: var(--text-secondary);
    line-height: 1;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

#app {
    max-width: 1400px;
    margin: 5rem auto 2rem;
    padding: 1rem 1.5rem;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 1.5rem;
    align-items: start;
}

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    padding: 1.5rem 1.8rem;
    transition: background 0.4s, border-color 0.4s, box-shadow 0.4s;
}

.editor-card .status-bar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.rich-editor {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-height: 60px;
    overflow: hidden;
    background: var(--editor-bg);
    color: var(--editor-color);
    transition: backdrop-filter 0.3s, background 0.3s, border-color 0.3s, color 0.3s;
    line-height: 1.6;
    outline: none;
    word-wrap: break-word;
    white-space: pre-wrap;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.rich-editor:focus {
    border-color: var(--apple-blue);
    background: var(--editor-focus-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.08);
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}

.toolbar .fmt-btn,
.toolbar .action-btn {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    padding: 0.3rem 0.7rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-primary);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 32px;
    min-width: 32px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.toolbar .fmt-btn:hover,
.toolbar .action-btn:hover:not(:disabled) {
    background: var(--btn-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.toolbar .fmt-btn:active,
.toolbar .action-btn:active:not(:disabled) {
    transform: translateY(0px);
    box-shadow: none;
}

.toolbar .action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.toolbar .color-picker {
    width: 32px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    cursor: pointer;
    background: none;
    transition: border-color 0.2s;
}

.toolbar .color-picker:hover {
    border-color: var(--apple-blue);
}

.history-index {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: 0.25rem;
}

.undo-btn, .redo-btn {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    padding: 0.3rem 0.7rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-primary);
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 32px;
    min-width: 36px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.undo-btn:hover:not(:disabled),
.redo-btn:hover:not(:disabled) {
    background: var(--btn-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.undo-btn:disabled,
.redo-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.search-section {
    position: relative;
    margin-bottom: 1.2rem;
}

.search-bar {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.search-input {
    flex: 1;
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border 0.15s, background 0.3s, box-shadow 0.15s;
    outline: none;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.search-input:focus {
    border-color: var(--apple-blue);
    background: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.06);
}

body.dark .search-input:focus {
    background: rgba(255, 255, 255, 0.08);
}

.search-mode {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    padding: 0.3rem 0.6rem;
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.search-mode:hover {
    background: var(--btn-hover);
}

.search-mode.active {
    background: var(--apple-blue);
    color: white;
    border-color: var(--apple-blue);
}

body.dark .search-mode.active {
    background: var(--apple-blue-dark);
    border-color: var(--apple-blue-dark);
}

.filter-btn {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    padding: 0.3rem 0.6rem;
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

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

.filter-btn.active {
    border-color: var(--apple-blue);
    background: var(--btn-active);
    color: var(--apple-blue);
}

body.dark .filter-btn.active {
    background: rgba(10, 132, 255, 0.15);
    color: var(--apple-blue-dark);
}

.filter-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    max-width: 300px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: var(--glass-shadow);
    padding: 1rem 1.2rem;
    z-index: 200;
    transition: opacity 0.2s, transform 0.2s;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
}

.filter-menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.filter-group {
    margin-bottom: 1rem;
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-group-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.filter-options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
}

.filter-options input[type="radio"],
.filter-options input[type="checkbox"] {
    accent-color: var(--apple-blue);
    cursor: pointer;
}

.filter-options .count {
    font-size: 0.7rem;
    color: var(--footer-color);
    margin-left: auto;
}

.preset-list {
    margin-top: 0.5rem;
}

#listContainer {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.2rem;
}

.preset-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--item-bg);
    border-radius: 12px;
    padding: 0.5rem 1rem 0.5rem 1.2rem;
    border: 1px solid var(--item-border);
    transition: background 0.15s, border 0.15s, transform 0.1s;
    cursor: pointer;
}

.preset-item:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.005);
}

.preset-name {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-primary);
    flex: 1;
    margin-right: 1rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preset-actions {
    display: flex;
    gap: 0.4rem;
    flex-shrink: 0;
}

.preset-actions button {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.2rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.12s;
    color: var(--text-secondary);
}

.preset-actions .btn-pos {
    border-color: rgba(0, 122, 255, 0.2);
    color: var(--apple-blue);
}

.preset-actions .btn-pos:hover {
    background: rgba(0, 122, 255, 0.06);
}

.preset-actions .btn-neg {
    border-color: rgba(255, 59, 48, 0.2);
    color: #ff3b30;
}

.preset-actions .btn-neg:hover {
    background: rgba(255, 59, 48, 0.04);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 0.5rem;
}

.pagination button {
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    padding: 0.3rem 0.9rem;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.15s;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 32px;
    min-width: 36px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.pagination button:hover:not(:disabled) {
    background: var(--btn-hover);
}

.pagination button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none !important;
}

.pagination span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

#appFooter {
    text-align: center;
    padding: 1.2rem 0 2rem;
    color: var(--footer-color);
    font-size: 0.85rem;
    border-top: 1px solid var(--glass-border);
    margin-top: 1.5rem;
}

.highlight-tag {
    border-radius: 3px;
    padding: 0 2px;
    transition: background-color 0.2s, color 0.2s;
}

@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: 1.2rem;
    }
    #app {
        padding: 0.5rem 0.8rem;
        margin-top: 4.5rem;
    }
    .card {
        padding: 1.2rem;
    }
    #appHeader {
        padding: 0.5rem 1rem;
    }
    .header-left .app-title {
        font-size: 1.1rem;
    }
    .preset-item {
        flex-wrap: wrap;
        gap: 0.4rem 0;
    }
    .preset-name {
        flex-basis: 100%;
    }
    .preset-actions {
        margin-left: auto;
    }
    .search-bar {
        flex-wrap: wrap;
    }
    .toolbar .fmt-btn,
    .toolbar .action-btn {
        font-size: 0.8rem;
        padding: 0.2rem 0.5rem;
        min-height: 28px;
        min-width: 28px;
    }
    .toolbar .color-picker {
        width: 28px;
        height: 28px;
    }
}