/* ===== CSS 变量定义 ===== */
:root {
    /* 颜色系统 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-color-light: #667eea;
    --accent-color-dark: #f093fb;
    
    /* 主题颜色 */
    --bg-light: #ffffff;
    --bg-dark: #0a0a0f;
    --text-light: #333333;
    --text-dark: #f0f0f0;
    --glass-light: rgba(255, 255, 255, 0.15);
    --glass-dark: rgba(0, 0, 0, 0.25);
    --border-light: rgba(255, 255, 255, 0.2);
    --border-dark: rgba(255, 255, 255, 0.1);
    
    /* 间距系统 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    
    /* 动画时间 */
    --transition-fast: 0.3s;
    --transition-normal: 0.5s;
    --transition-slow: 0.8s;
    
    /* 导航高度 */
    --nav-height: 70px;
}

/* ===== 重置与基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    position: relative;
    transition: background-color var(--transition-normal) ease;
}

body:not(.dark-theme) {
    background-color: var(--bg-light);
    color: var(--text-light);
}

body.dark-theme {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

/* ===== 工具类 ===== */
.glass-effect {
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
}

.glass-light {
    background-color: var(--glass-light);
    border: 1px solid var(--border-light);
}

.glass-dark {
    background-color: var(--glass-dark);
    border: 1px solid var(--border-dark);
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-column {
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

/* ===== 背景系统 ===== */
.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    contain: strict;
}

.gradient-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.98;
    transition: opacity var(--transition-normal) ease;
    filter: blur(0.5px);
    will-change: background;
}

.noise-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.04;
    mix-blend-mode: overlay;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 128px 128px, 64px 64px;
    pointer-events: none;
    z-index: 2;
    animation: noiseFloat 20s infinite linear;
}

.texture-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(255, 255, 255, 0.02) 1px,
            rgba(255, 255, 255, 0.02) 2px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 1px,
            rgba(255, 255, 255, 0.01) 1px,
            rgba(255, 255, 255, 0.01) 2px
        );
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 1;
}

.gradient-enhancer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.03) 0%,
        rgba(255, 255, 255, 0.01) 20%,
        transparent 50%,
        rgba(255, 255, 255, 0.01) 80%,
        rgba(255, 255, 255, 0.03) 100%
    );
    mix-blend-mode: overlay;
    opacity: 0.4;
    pointer-events: none;
    animation: enhancerMove 30s infinite linear;
}

/* ===== 粒子系统 ===== */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 3;
}

.particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform;
}

/* ===== 导航栏 ===== */
.nav-container {
    position: fixed;
    top: -100px;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    transition: top 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.1);
}

.nav-container.glass-light {
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-container.glass-dark {
    background-color: rgba(10, 10, 15, 0.95);
    border-bottom-color: var(--border-dark);
}

.nav-container.nav-active {
    top: 0;
}

.nav-title {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity 0.5s ease 0.3s, transform 0.5s ease 0.3s;
}

body.dark-theme .nav-title {
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-container.nav-active .nav-title {
    opacity: 1;
    transform: translateY(0);
}

.nav-buttons {
    display: flex;
    gap: 20px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease 0.4s, transform 0.5s ease 0.4s;
}

.nav-container.nav-active .nav-buttons {
    opacity: 1;
    transform: translateY(0);
}

.nav-button {
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    font-size: 1rem;
    border: none;
    background: linear-gradient(135deg, var(--glass-light), rgba(255, 255, 255, 0.15));
    backdrop-filter: blur(10px);
    color: inherit;
}

.nav-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.mobile-menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding: 0;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--accent-color-light);
    transition: all var(--transition-fast) ease;
    border-radius: 2px;
}

body.dark-theme .mobile-menu-toggle span {
    background: var(--accent-color-dark);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===== 内容区域 ===== */
.content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    padding: clamp(20px, 5vw, 40px);
    transition: all var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: auto;
}

.content.nav-active {
    justify-content: flex-start;
}

h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
    margin-bottom: clamp(20px, 4vw, 30px);
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.1;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 20px rgba(102, 126, 234, 0.2);
    animation: titleFloat 6s ease-in-out infinite;
    transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
}

body.dark-theme h1 {
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 20px rgba(240, 147, 251, 0.2);
}

.content.nav-active h1 {
    font-size: 1.8rem;
    margin: 0;
    animation: none;
    opacity: 0;
    transform: translateY(-50px) scale(0.8);
    position: absolute;
    pointer-events: none;
}

.info {
    font-size: clamp(1.1rem, 3vw, 1.3rem);
    max-width: min(800px, 90vw);
    line-height: 1.7;
    margin-bottom: clamp(30px, 6vw, 50px);
    padding: clamp(25px, 5vw, 35px);
    border-radius: 24px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
}

.info.glass-light {
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--border-light);
}

.info.glass-dark {
    background-color: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-dark);
}

.info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
}

.content.nav-active .info {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    pointer-events: none;
}

.techniques {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: clamp(10px, 3vw, 15px);
    margin-top: clamp(25px, 5vw, 35px);
    transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
}

.content.nav-active .techniques {
    transform: translateY(20px) scale(0.9);
    opacity: 0;
    pointer-events: none;
}

.technique {
    padding: clamp(10px, 2vw, 14px) clamp(20px, 4vw, 28px);
    border-radius: 50px;
    font-size: clamp(0.9rem, 2vw, 1rem);
    font-weight: 600;
    box-shadow: 
        0 8px 20px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: all var(--transition-fast) ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    border: none;
}

.technique.glass-light {
    background: linear-gradient(135deg, var(--glass-light), rgba(255, 255, 255, 0.15));
    border: 1px solid var(--border-light);
}

.technique.glass-dark {
    background: linear-gradient(135deg, var(--glass-dark), rgba(0, 0, 0, 0.2));
    border: 1px solid var(--border-dark);
}

.technique::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.technique:hover::before {
    left: 100%;
}

.technique:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 12px 25px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* ===== 内容卡片 ===== */
.content-card-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 1000;
    pointer-events: none;
}

.content-card {
    width: 90%;
    max-width: 1200px;
    height: 80vh;
    min-height: 500px;
    max-height: 800px;
    border-radius: 24px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.15);
    padding: 30px;
    opacity: 0;
    transform: translateY(100px) scale(0.8);
    transition: opacity var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1), 
                transform var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: auto;
    display: flex;
    flex-direction: column;
}

.content-card.glass-light {
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--border-light);
}

.content-card.glass-dark {
    background-color: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-dark);
}

.content-card.active {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.content-card-header {
    margin-bottom: 30px;
    text-align: center;
}

.content-card h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    color: inherit;
}

.content-card-description {
    font-size: 1.1rem;
    opacity: 0.8;
}

/* ===== 子卡片系统 ===== */
.sub-cards-container {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    overflow-y: auto;
    padding-right: 15px;
    padding-bottom: 10px;
}

.sub-cards-container.scrollable-content {
    scrollbar-width: thin;
}

.sub-cards-container.scrollable-content::-webkit-scrollbar {
    width: 8px;
}

.sub-cards-container.scrollable-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
}

.sub-cards-container.scrollable-content::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

body.dark-theme .sub-cards-container.scrollable-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.2);
}

body.dark-theme .sub-cards-container.scrollable-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
}

.sub-card {
    border-radius: 16px;
    padding: 25px;
    transition: all var(--transition-fast) ease;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.sub-card.glass-light {
    background: linear-gradient(135deg, var(--glass-light), rgba(255, 255, 255, 0.1));
    border: 1px solid var(--border-light);
}

.sub-card.glass-dark {
    background: linear-gradient(135deg, var(--glass-dark), rgba(0, 0, 0, 0.1));
    border: 1px solid var(--border-dark);
}

.sub-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.sub-card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    font-size: 28px;
    background: var(--primary-gradient);
    color: white;
}

body.dark-theme .sub-card-icon {
    background: var(--secondary-gradient);
}

.sub-card h3 {
    font-size: 1.3rem;
    margin: 0;
}

.sub-card p {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.6;
    margin: 0;
}

.sub-card-features {
    margin-top: 15px;
}

.sub-card-features ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sub-card-features li {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.sub-card-features li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color-light);
}

body.dark-theme .sub-card-features li:before {
    color: var(--accent-color-dark);
}

.sub-card-action {
    margin-top: 15px;
}

.sub-card-button {
    padding: 10px 20px;
    border-radius: 50px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    font-size: 0.9rem;
}

body.dark-theme .sub-card-button {
    background: var(--secondary-gradient);
}

.sub-card-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

body.dark-theme .sub-card-button:hover {
    box-shadow: 0 8px 20px rgba(240, 147, 251, 0.3);
}

/* ===== 加载状态 ===== */
.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid var(--accent-color-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

body.dark-theme .loading-spinner {
    border: 3px solid rgba(0, 0, 0, 0.3);
    border-top: 3px solid var(--accent-color-dark);
}

/* ===== 动画定义 ===== */
@keyframes noiseFloat {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(10px, -10px); }
    50% { transform: translate(-5px, 5px); }
    75% { transform: translate(-10px, -5px); }
}

@keyframes enhancerMove {
    0% { transform: translateX(-10%) translateY(-10%); }
    100% { transform: translateX(10%) translateY(10%); }
}

@keyframes titleFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 20px;
    }
    
    .nav-buttons {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 20px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-light);
        z-index: 1002;
        gap: 15px;
    }
    
    .nav-buttons.mobile-open {
        display: flex;
    }
    
    body.dark-theme .nav-buttons.mobile-open {
        border-bottom-color: var(--border-dark);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .content-card {
        width: 95%;
        height: 85vh;
        padding: 20px;
        min-height: 400px;
    }
    
    .sub-cards-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    .nav-title {
        font-size: 1.4rem;
    }
    
    .content-card {
        padding: 15px;
        border-radius: 20px;
    }
    
    .content-card h2 {
        font-size: 1.5rem;
    }
    
    .sub-card {
        padding: 15px;
    }
}
/* ===== 工具详情弹窗样式 ===== */
.tool-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(5px);
}

.tool-modal.active {
    opacity: 1;
}

.tool-modal-content {
    background: var(--glass-light);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    max-width: 900px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(30px);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid var(--border-light);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

body.dark-theme .tool-modal-content {
    background: var(--glass-dark);
    border-color: var(--border-dark);
}

.tool-modal.active .tool-modal-content {
    transform: translateY(0);
}

.tool-modal-header {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tool-modal-icon {
    width: 70px;
    height: 70px;
    border-radius: 16px;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-right: 25px;
    flex-shrink: 0;
}

body.dark-theme .tool-modal-icon {
    background: var(--secondary-gradient);
}

.tool-modal-title-section {
    flex: 1;
}

.tool-modal-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin: 0 0 8px 0;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.dark-theme .tool-modal-title {
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tool-modal-version {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-right: 10px;
}

.modal-close-btn {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
    flex-shrink: 0;
    margin-left: 10px;
}

.modal-close-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(90deg);
}

.tool-modal-description {
    font-size: 1.15rem;
    line-height: 1.7;
    margin-bottom: 35px;
    color: inherit;
    opacity: 0.9;
}

.tool-modal-features h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 35px;
}

.feature-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.feature-item-icon {
    margin-right: 12px;
    color: var(--accent-color-light);
    font-size: 1.1rem;
}

body.dark-theme .feature-item-icon {
    color: var(--accent-color-dark);
}

.tool-modal-actions {
    display: flex;
    gap: 20px;
    margin-top: 40px;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-action-btn {
    flex: 1;
    padding: 16px 24px;
    border-radius: 14px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.use-tool-btn {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

body.dark-theme .use-tool-btn {
    background: var(--secondary-gradient);
    box-shadow: 0 8px 25px rgba(240, 147, 251, 0.3);
}

.use-tool-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
}

body.dark-theme .use-tool-btn:hover {
    box-shadow: 0 15px 35px rgba(240, 147, 251, 0.4);
}

.close-modal-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-light);
    color: inherit;
}

body.dark-theme .close-modal-btn {
    border-color: var(--border-dark);
}

.close-modal-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

/* ===== 滚动条样式 ===== */
.tool-modal-content::-webkit-scrollbar {
    width: 8px;
}

.tool-modal-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

.tool-modal-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.tool-modal-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ===== 响应式调整 ===== */
@media (max-width: 768px) {
    .tool-modal-content {
        padding: 25px;
        width: 95%;
        margin: 20px;
    }
    
    .tool-modal-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .tool-modal-icon {
        margin-right: 0;
        margin-bottom: 20px;
    }
    
    .tool-modal-title {
        font-size: 1.8rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-modal-actions {
        flex-direction: column;
    }
    
    .modal-action-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .tool-modal-content {
        padding: 20px;
        border-radius: 20px;
    }
    
    .tool-modal-icon {
        width: 60px;
        height: 60px;
        font-size: 28px;
    }
    
    .tool-modal-title {
        font-size: 1.5rem;
    }
    
    .tool-modal-description {
        font-size: 1rem;
    }
}