:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-primary: #58a6ff;
    --accent-secondary: #388bfd;
    --accent-success: #3fb950;
    --accent-warning: #d29922;
    --accent-danger: #f85149;
    --accent-purple: #a371f7;
    --border-color: #30363d;
    --border-light: #21262d;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(88, 166, 255, 0.3);
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    --input-background: #0d1117;
    --input-border: #30363d;
    --input-focus: #58a6ff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #58a6ff 0%, #a371f7 100%);
    --gradient-success: linear-gradient(135deg, #3fb950 0%, #2ea043 100%);
    --gradient-danger: linear-gradient(135deg, #f85149 0%, #da3633 100%)
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --bg-hover: #d0d7de;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --text-muted: #8c959f;
    --accent-primary: #0969da;
    --accent-secondary: #0550ae;
    --accent-success: #1a7f37;
    --accent-warning: #9a6700;
    --accent-danger: #cf222e;
    --accent-purple: #8250df;
    --border-color: #d0d7de;
    --border-light: #eaeef2;
    --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.08);
    --shadow-md: 0 4px 12px rgba(31, 35, 40, 0.12);
    --shadow-lg: 0 8px 24px rgba(31, 35, 40, 0.16);
    --shadow-glow: 0 0 20px rgba(9, 105, 218, 0.2);
    --input-background: #ffffff;
    --input-border: #d0d7de;
    --input-focus: #0969da;
    --gradient-primary: linear-gradient(135deg, #0969da 0%, #8250df 100%);
    --gradient-accent: linear-gradient(135deg, #0969da 0%, #8250df 100%)
}

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

html {
    scroll-behavior: smooth
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal)
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 5px
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
    border: 2px solid var(--bg-secondary)
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted)
}

.main-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px;
    animation: fadeInUp 0.5s ease-out
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px)
    }

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

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color)
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 12px
}

.header h1::before {
    content: "\f5c3";
    font-family: "Font Awesome 7 Free";
    font-weight: 900;
    -webkit-text-fill-color: var(--accent-primary);
    font-size: 1.5rem
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast)
}

.theme-toggle::before {
    content: "\f186";
    font-family: "Font Awesome 7 Free";
    font-weight: 900;
    font-size: 16px
}

[data-theme="light"] .theme-toggle::before {
    content: "\f185"
}

.theme-toggle:active {
    transform: scale(0.96);
    background: var(--bg-hover)
}

.tab-navigation {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    padding: 6px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow-x: auto
}

.tab-button {
    flex: 1;
    min-width: max-content;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap
}

.tab-button[data-tab="ascii-unicode"]::before {
    content: "\f121";
    font-family: "Font Awesome 7 Free";
    font-weight: 900
}

.tab-button[data-tab="qq-emoji"]::before {
    content: "\f118";
    font-family: "Font Awesome 7 Free";
    font-weight: 400
}

.tab-button[data-tab="control-chars"]::before {
    content: "\f11c";
    font-family: "Font Awesome 7 Free";
    font-weight: 400
}

.tab-button.active {
    background: var(--accent-primary);
    color: #ffffff;
    box-shadow: var(--shadow-md)
}

.tab-button:active {
    transform: scale(0.97)
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease
}

.tab-content.active {
    display: block
}

@keyframes fadeIn {
    from {
        opacity: 0
    }

    to {
        opacity: 1
    }
}

.section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: all var(--transition-normal)
}

.section h2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: 10px
}

.section h2::before {
    content: "\f0e7";
    font-family: "Font Awesome 7 Free";
    font-weight: 900;
    color: var(--accent-primary);
    font-size: 1rem
}

.section p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.7
}

label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
    margin-top: 14px
}

label:first-of-type {
    margin-top: 0
}

input[type="text"],
input[type="number"],
textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--input-background);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-md);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-fast);
    margin-bottom: 12px
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15)
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted)
}

textarea {
    min-height: 100px;
    resize: vertical
}

select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    background: var(--input-background);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-md);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%238b949e'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    transition: all var(--transition-fast);
    margin-bottom: 12px
}

select:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15)
}

.select2-container--default .select2-selection--single {
    height: 44px;
    padding: 8px 16px;
    background: var(--input-background);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast)
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    color: var(--text-primary);
    line-height: 26px;
    padding-left: 0
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    height: 42px;
    right: 12px
}

.select2-container--default .select2-selection--single .select2-selection__arrow b {
    border-color: var(--text-secondary) transparent transparent transparent
}

.select2-container--default.select2-container--open .select2-selection--single {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15)
}

.select2-container--default .select2-results__option {
    padding: 10px 16px;
    color: var(--text-primary)
}

.select2-container--default .select2-results__option--highlighted[aria-selected] {
    background: var(--accent-primary);
    color: #ffffff
}

.select2-dropdown {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden
}

.select2-search--dropdown .select2-search__field {
    background: var(--input-background);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-sm);
    padding: 10px 14px
}

.select2-search--dropdown .select2-search__field:focus {
    outline: none;
    border-color: var(--input-focus)
}

.select2-results {
    background: var(--bg-secondary)
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap
}

.section>button:not(.copy-button):not(.clear-button),
#btnConvertAscii,
#btnConvertUnicode,
#btnGenerateConvert,
#btnGenerateSingle,
#btnGenerateSequence,
#btnReverseEmoji,
#btnGenerateText {
    background: var(--gradient-accent);
    color: #ffffff;
    margin-top: 8px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm)
}

.section>button:not(.copy-button):not(.clear-button)::before,
#btnConvertAscii::before,
#btnConvertUnicode::before {
    content: "\f2f1";
    font-family: "Font Awesome 7 Free";
    font-weight: 900
}

#btnGenerateConvert::before,
#btnGenerateSingle::before,
#btnGenerateSequence::before {
    content: "\f0d0";
    font-family: "Font Awesome 7 Free";
    font-weight: 900
}

#btnReverseEmoji::before {
    content: "\f002";
    font-family: "Font Awesome 7 Free";
    font-weight: 900
}

#btnGenerateText::before {
    content: "\f1fc";
    font-family: "Font Awesome 7 Free";
    font-weight: 900
}

.section>button:not(.copy-button):not(.clear-button):active,
#btnConvertAscii:active,
#btnConvertUnicode:active,
#btnGenerateConvert:active,
#btnGenerateSingle:active,
#btnGenerateSequence:active,
#btnReverseEmoji:active,
#btnGenerateText:active {
    transform: scale(0.97);
    box-shadow: none
}

.copy-button {
    background: var(--accent-success);
    color: #ffffff;
    margin-right: 8px
}

.copy-button::before {
    content: "\f0c5";
    font-family: "Font Awesome 7 Free";
    font-weight: 400
}

.copy-button:active {
    transform: scale(0.97);
    background: #2ea043
}

.clear-button {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color)
}

.clear-button::before {
    content: "\f2ed";
    font-family: "Font Awesome 7 Free";
    font-weight: 400
}

.clear-button:active {
    transform: scale(0.97);
    background: var(--bg-hover)
}

.output {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-md);
    padding: 16px;
    margin-bottom: 16px;
    min-height: 60px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 14px;
    color: var(--text-primary);
    word-break: break-all;
    white-space: pre-wrap;
    line-height: 1.7;
    position: relative
}

.output:empty::before {
    content: "结果将在这里显示...";
    color: var(--text-muted);
    font-style: italic;
    font-family: inherit
}

#reverseOutput {
    max-height: 300px;
    overflow-y: auto;
    overflow-x: hidden
}

#sequenceOutput,
#numberOutput {
    max-height: 180px;
    overflow-y: auto;
    overflow-x: hidden
}

#asciiOutput,
#unicodeOutput,
#singleEmojiOutput,
#text-inserter-output {
    max-height: 120px;
    overflow-y: auto;
    overflow-x: hidden
}

.image-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-md);
    margin-bottom: 16px;
    min-height: 50px;
    max-height: 220px;
    overflow-y: auto;
    align-content: flex-start
}

.image-preview:empty {
    display: none
}

.image-preview img {
    height: 40px;
    width: 40px;
    object-fit: contain;
    border-radius: var(--border-radius-sm);
    background: var(--bg-secondary);
    padding: 4px;
    transition: transform var(--transition-fast);
    flex-shrink: 0
}

.direct-copy-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-md);
    margin-bottom: 12px
}

.direct-copy-section span {
    font-size: 14px;
    color: var(--text-secondary)
}

.direct-copy-section code {
    background: var(--bg-primary);
    color: var(--accent-purple);
    padding: 3px 8px;
    border-radius: var(--border-radius-sm);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 13px;
    border: 1px solid var(--border-color)
}

.direct-copy-section .copy-button {
    padding: 8px 16px;
    font-size: 13px
}

.control-char-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px
}

.control-char-buttons button {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    padding: 10px 18px
}

.control-char-buttons button::before {
    content: "\f067";
    font-family: "Font Awesome 7 Free";
    font-weight: 900;
    font-size: 12px
}

.control-char-buttons button:active {
    transform: scale(0.97);
    background: var(--accent-primary);
    color: #ffffff
}

.reverse-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 0;
    border-bottom: 1px dashed var(--border-light)
}

.reverse-item:last-child {
    border-bottom: none;
    padding-bottom: 0
}

.reverse-item img {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-sm);
    background: var(--bg-secondary);
    padding: 4px;
    flex-shrink: 0
}

.reverse-item span {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6
}

.reverse-img-error {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-muted);
    font-size: 11px;
    font-family: "SFMono-Regular", Consolas, monospace;
    flex-shrink: 0
}

.copy-alert {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--accent-success);
    color: #ffffff;
    padding: 14px 28px;
    border-radius: var(--border-radius-lg);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.35s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 9999;
    display: flex;
    align-items: center;
    gap: 10px
}

.copy-alert::before {
    content: "\f00c";
    font-family: "Font Awesome 7 Free";
    font-weight: 900;
    font-size: 16px
}

.copy-alert.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0)
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap
}

.button-group .copy-button,
.button-group .clear-button {
    flex: 1;
    min-width: 120px
}

@keyframes pulse {
    0%,
    100% {
        opacity: 1
    }

    50% {
        opacity: 0.5
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite
}

[data-tooltip] {
    position: relative
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    pointer-events: none;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    z-index: 100
}

/* ============ Hover效果 - 集中管理 ============ */
@media (hover:hover) {
    .theme-toggle:hover {
        background: var(--bg-hover);
        border-color: var(--accent-primary);
        box-shadow: var(--shadow-glow)
    }

    .tab-button:not(.active):hover {
        background: var(--bg-hover);
        color: var(--text-primary)
    }

    .section:hover {
        border-color: var(--border-color);
        box-shadow: var(--shadow-md)
    }

    .section>button:not(.copy-button):not(.clear-button):hover,
    #btnConvertAscii:hover,
    #btnConvertUnicode:hover,
    #btnGenerateConvert:hover,
    #btnGenerateSingle:hover,
    #btnGenerateSequence:hover,
    #btnReverseEmoji:hover,
    #btnGenerateText:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-md), var(--shadow-glow)
    }

    .copy-button:hover {
        background: #2ea043;
        transform: translateY(-2px);
        box-shadow: var(--shadow-md)
    }

    .clear-button:hover {
        color: var(--accent-danger);
        border-color: var(--accent-danger);
        background: rgba(248, 81, 73, 0.1)
    }

    .image-preview img:hover {
        transform: scale(1.3);
        z-index: 10;
        box-shadow: var(--shadow-md)
    }

    .control-char-buttons button:hover {
        background: var(--accent-primary);
        color: #ffffff
    }

    [data-tooltip]:hover::after {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(-4px)
    }
}

/* ============ 响应式设计 ============ */
@media (max-width:768px) {
    .main-container {
        padding: 16px
    }

    .header {
        flex-direction: column;
        align-items: flex-start
    }

    .header h1 {
        font-size: 1.4rem
    }

    .tab-navigation {
        flex-direction: column
    }

    .tab-button {
        justify-content: flex-start;
        padding: 14px 18px
    }

    .section {
        padding: 18px
    }

    .section h2 {
        font-size: 1.05rem
    }

    button {
        width: 100%;
        justify-content: center
    }

    .copy-button,
    .clear-button {
        flex: 1
    }

    .section>.copy-button,
    .section>.clear-button {
        margin-bottom: 8px
    }

    .direct-copy-section {
        flex-direction: column;
        align-items: flex-start
    }

    .direct-copy-section .copy-button {
        width: 100%
    }
}