:root {
    --primary: #0f172a;
    --primary-light: #334155;
    --secondary: #64748b;
    --accent: #0ea5e9;
    /* Sky 500 */
    --accent-hover: #0284c7;
    --accent-gradient: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    --success: #10b981;
    --bg-page: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.7);
    --border: rgba(226, 232, 240, 0.8);
    --glass-border: 1px solid rgba(255, 255, 255, 0.6);
    --glass-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.05);
    --text-main: #1e293b;
    --text-sub: #64748b;
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
}

* {
    box-sizing: border-box;
    outline: none;
}

body {
    background-color: var(--bg-page);
    background-image:
        radial-gradient(circle at 0% 0%, rgba(14, 165, 233, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 40px 32px;
}

.header {
    text-align: center;
    margin-bottom: 32px;
    animation: fadeInDown 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0 0 16px 0;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.header p {
    font-size: 1.25rem;
    color: var(--text-sub);
    margin: 0;
    font-weight: 400;
    opacity: 0.8;
}

.header-hint {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-top: 8px;
}

.main-content {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 32px;
    align-items: stretch;
    animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1) 0.2s backwards;
}

.card {
    background: var(--bg-card);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    border: var(--glass-border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-header {
    padding: 24px 32px;
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.4);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.01em;
}

.card-content {
    padding: 32px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.input-textarea {
    width: 100%;
    min-height: 480px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    background: #fff;
    color: var(--text-main);
    resize: none;
    transition: all 0.3s ease;
    flex: 1;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.input-textarea:focus {
    outline: none;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1), inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.btn {
    height: 48px;
    border: none;
    border-radius: 9999px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(14, 165, 233, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: white;
    color: var(--text-main);
    border: 1px solid var(--border);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.btn-secondary:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.btn-secondary:active {
    transform: translateY(0);
    background: #f1f5f9;
}

.btn-sm {
    height: 36px;
    padding: 0 20px;
    font-size: 13px;
    border-radius: 9999px;
    width: auto;
}

.btn-accent {
    background: rgba(14, 165, 233, 0.1);
    color: var(--accent);
    border: 1px solid rgba(14, 165, 233, 0.2);
}

.btn-accent:hover {
    background: rgba(14, 165, 233, 0.15);
    transform: translateY(-1px);
}

.btn-accent:active {
    transform: translateY(0);
    background: rgba(14, 165, 233, 0.2);
}

.diagram-container {
    width: 100%;
    flex: 1;
    min-height: 600px;
    background-color: #ffffff;
    background-image: radial-gradient(#cbd5e1 1.5px, transparent 1.5px);
    background-size: 24px 24px;
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.6);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.01);
    transition: background-image 0.3s ease;
}

.diagram-container.no-grid {
    background-image: none;
}

.background-toggle {
    position: absolute;
    top: 16px;
    left: 16px;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    border: 1px solid rgba(226, 232, 240, 0.6);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 100;
}

.background-toggle:hover {
    background: rgba(255, 255, 255, 1);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.background-toggle i {
    font-size: 18px;
    color: var(--accent);
    transition: color 0.3s ease;
}

.background-toggle:hover i {
    color: var(--accent-hover);
}

.background-toggle:active {
    transform: scale(0.95);
}

.colorize-toggle {
    position: absolute;
    top: 66px;
    left: 16px;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    border: 1px solid rgba(226, 232, 240, 0.6);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 100;
}

.colorize-toggle:hover {
    background: rgba(255, 255, 255, 1);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.colorize-toggle i {
    font-size: 18px;
    transition: color 0.3s ease;
}

.colorize-toggle.active {
    background: linear-gradient(135deg, #dbeafe 0%, #f3e8ff 50%, #ffe4e6 100%);
    border-color: rgba(14, 165, 233, 0.3);
}

.colorize-toggle.active:hover {
    background: linear-gradient(135deg, #bfdbfe 0%, #e9d5ff 50%, #fecdd3 100%);
}

.colorize-toggle.active i {
    color: var(--accent);
}

.colorize-toggle:not(.active) i {
    color: var(--secondary);
}

.colorize-toggle:hover i {
    color: var(--accent-hover);
}

.colorize-toggle:active {
    transform: scale(0.95);
}

.colorize-toggle.active:active {
    transform: scale(0.95);
}

.button-group {
    display: flex;
    gap: 16px;
    margin-top: auto;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    transition: all 0.3s ease;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(14, 165, 233, 0.1);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.error-message {
    background: #fef2f2;
    color: #ef4444;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border: 1px solid #fee2e2;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 20px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 0.85rem;
    color: var(--text-sub);
    transition: all 0.2s ease;
}

.legend-item:hover {
    background: #fff;
    transform: translateY(-1px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Tablet and below */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .app-container {
        padding: 24px;
    }
}

/* Mobile and small tablets */
@media (max-width: 768px) {

    /* 禁用移动端的hover效果,避免点击后状态保持 */
    .btn-primary:hover {
        transform: none;
        box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
    }

    .btn-secondary:hover {
        transform: none;
        background: white;
        border-color: var(--border);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    }

    .btn-accent:hover {
        transform: none;
        background: rgba(14, 165, 233, 0.1);
    }

    .background-toggle:hover {
        transform: none;
        background: rgba(255, 255, 255, 0.9);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }

    .background-toggle:hover i {
        color: var(--accent);
    }

    .colorize-toggle:hover {
        transform: none;
        background: rgba(255, 255, 255, 0.9);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }

    .colorize-toggle.active:hover {
        transform: none;
        background: linear-gradient(135deg, #dbeafe 0%, #f3e8ff 50%, #ffe4e6 100%);
    }

    .colorize-toggle:hover i {
        color: var(--secondary);
    }

    .colorize-toggle.active:hover i {
        color: var(--accent);
    }

    /* 移动端active状态:点击时放大效果 */
    .btn-primary:active {
        transform: scale(1.05);
    }

    .btn-secondary:active {
        transform: scale(1.05);
        background: #f1f5f9;
    }

    .btn-accent:active {
        transform: scale(1.05);
        background: rgba(14, 165, 233, 0.2);
    }

    .background-toggle:active {
        transform: scale(1.15);
    }

    .colorize-toggle:active,
    .colorize-toggle.active:active {
        transform: scale(1.15);
    }

    .app-container {
        padding: 16px;
    }

    .header {
        margin-bottom: 32px;
    }

    .header h1 {
        font-size: 2.5rem;
    }

    .header p {
        font-size: 1rem;
    }

    .main-content {
        gap: 20px;
    }

    .card-header {
        padding: 16px 20px;
    }

    .card-content {
        padding: 20px;
        gap: 16px;
    }

    .card-title {
        font-size: 1rem;
    }

    .input-textarea {
        min-height: 250px;
        padding: 16px;
        font-size: 13px;
    }

    .CodeMirror {
        height: 300px !important;
        font-size: 13px;
    }

    .button-group {
        gap: 10px;
    }

    .btn {
        height: 44px;
        font-size: 13px;
    }

    .btn-sm {
        height: 38px;
        font-size: 13px;
    }

    .diagram-container {
        min-height: 400px;
        border-radius: var(--radius-md);
    }
}

/* Small mobile phones */
@media (max-width: 480px) {
    .app-container {
        padding: 12px;
    }

    .header {
        margin-bottom: 24px;
    }

    .header h1 {
        font-size: 1.75rem;
        letter-spacing: -0.02em;
    }

    .header p {
        font-size: 0.875rem;
    }

    .main-content {
        gap: 16px;
    }

    .card {
        border-radius: var(--radius-md);
    }

    .card-header {
        padding: 12px 16px;
    }

    .card-content {
        padding: 16px;
        gap: 12px;
    }

    /* 隐藏ER预览区的提示文本和分隔符 */
    .card-header>div:last-child>div:first-child {
        display: none !important;
    }

    .card-header>div:last-child .ant-switch {
        transform: scale(0.85);
    }

    /* 手机版隐藏图例 */
    .output-section .card-header>div:first-child {
        display: none !important;
    }

    /* 手机版控制区域居中 */
    .output-section .card-header {
        justify-content: center !important;
    }

    .output-section .card-header>div:last-child {
        margin: 0 !important;
        flex-wrap: wrap;
        gap: 8px !important;
        justify-content: center;
    }

    .card-title {
        font-size: 0.9rem;
    }

    .card-title span {
        font-size: 1.2rem !important;
    }

    .input-textarea {
        min-height: 200px;
        padding: 12px;
        font-size: 12px;
    }

    .CodeMirror {
        height: 250px !important;
        font-size: 12px;
    }

    .button-group {
        gap: 8px;
    }

    .btn {
        height: 40px;
        font-size: 12px;
        padding: 0 12px;
    }

    .btn-sm {
        height: 32px;
        font-size: 11px;
        padding: 0 10px;
        gap: 4px;
    }

    .diagram-container {
        min-height: 300px;
        border-radius: 12px;
        background-size: 16px 16px;
    }

    .legend-item {
        font-size: 0.75rem;
        padding: 4px 10px;
    }

    .error-message {
        padding: 12px 16px;
        font-size: 0.875rem;
    }

    /* 隐藏ER预览标头中的提示文本和分隔符 */
    .output-section .card-header>div:last-child>div:first-child,
    .output-section .card-header>div:last-child>div:nth-child(2) {
        display: none;
    }

    /* 手机版隐藏图例 */
    .output-section .card-header>div:first-child {
        display: none !important;
    }

    /* 手机版控制区域居中 */
    .output-section .card-header {
        justify-content: center !important;
    }

    .output-section .card-header>div:last-child {
        margin: 0 !important;
        flex-wrap: wrap;
        gap: 8px !important;
        justify-content: center;
    }
}

.CodeMirror {
    height: 480px !important;
    font-family: var(--font-mono) !important;
    font-size: 14px;
    line-height: 1.6;
    background: #fff;
}

.CodeMirror-gutters {
    background: #f8fafc;
    border-right: 1px solid #e2e8f0;
}

.CodeMirror-linenumber {
    color: #94a3b8;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* GitHub Corner - 立体纸张折叠效果 */
.github-corner {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 9999;
    border: 0;
    width: 80px;
    height: 80px;
    overflow: hidden;
}

.github-corner svg {
    fill: #0f172a;
    color: #fff;
    position: absolute;
    top: 0;
    border: 0;
    left: 0;
    transition: all 0.3s ease;
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.2));
    transform: scaleX(-1);
}

/* 纸张折叠效果 - 上层阴影 */
.github-corner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 80px 80px 0 0;
    border-color: rgba(15, 23, 42, 0.05) transparent transparent transparent;
    pointer-events: none;
    transition: all 0.3s ease;
}

/* 纸张折叠效果 - 下层阴影 */
.github-corner::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 80px 80px;
    border-color: transparent transparent rgba(0, 0, 0, 0.03) transparent;
    pointer-events: none;
    transition: all 0.3s ease;
    transform-origin: top left;
}

.github-corner:hover::before {
    border-color: rgba(15, 23, 42, 0.1) transparent transparent transparent;
}

.github-corner:hover::after {
    border-color: transparent transparent rgba(0, 0, 0, 0.06) transparent;
}

.github-corner:hover svg {
    filter: drop-shadow(3px 3px 6px rgba(0, 0, 0, 0.3));
    transform: scaleX(-1.05) scaleY(1.05);
}

.github-corner .octo-arm {
    transform-origin: 130px 106px;
}

.github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {

    0%,
    100% {
        transform: rotate(0);
    }

    20%,
    60% {
        transform: rotate(-25deg);
    }

    40%,
    80% {
        transform: rotate(10deg);
    }
}

@media (max-width: 500px) {
    .github-corner:hover .octo-arm {
        animation: none;
    }

    .github-corner .octo-arm {
        animation: octocat-wave 560ms ease-in-out;
    }

    .github-corner {
        width: 60px;
        height: 60px;
    }

    .github-corner svg {
        width: 60px;
        height: 60px;
    }
}