/* ColorCraft - Professional Color Tools */
/* Harmonious Gradient Theme */

/* CSS Variables */
:root {
    /* 企业级专业色彩体系 - 深蓝科技风格 */
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
    --secondary-gradient: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 50%, #7dd3fc 100%);
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #a78bfa 50%, #c4b5fd 100%);
    --success-gradient: linear-gradient(135deg, #10b981 0%, #34d399 50%, #6ee7b7 100%);
    --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #fbbf24 50%, #fcd34d 100%);
    --danger-gradient: linear-gradient(135deg, #ef4444 0%, #f87171 50%, #fca5a5 100%);
    
    /* 增强的基础颜色 */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-active: #1e40af;
    --primary-light: #dbeafe;
    
    --secondary-color: #0ea5e9;
    --secondary-hover: #0284c7;
    --secondary-active: #0369a1;
    --secondary-light: #cff4fc;
    
    --accent-color: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent-active: #6d28d9;
    --accent-light: #ede9fe;
    
    --success-color: #10b981;
    --success-hover: #059669;
    --success-active: #047857;
    --success-light: #dcfce7;
    
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --warning-active: #b45309;
    --warning-light: #fef3c7;
    
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --danger-active: #b91c1c;
    --danger-light: #fee2e2;
    
    --info-color: #0ea5e9;
    --info-hover: #0284c7;
    --info-active: #0369a1;
    --info-light: #e0f2fe;
    
    /* Enhanced Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-elevated: #ffffff;
    --bg-overlay: rgba(255, 255, 255, 0.95);
    
    /* Enhanced Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-tertiary: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    
    /* Enhanced Border Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;
    
    /* Enhanced Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.12);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.2);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
    
    /* Enhanced Border Radius */
    --radius-xs: 0.125rem;
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Enhanced Transitions */
    --transition-xs: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-sm: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-md: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-lg: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-xl: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 企业级字体体系 */
    --font-sans: 'SF Pro Display', 'Helvetica Neue', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-serif: 'Georgia', 'Times New Roman', Times, serif;
    --font-mono: 'SF Mono', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
    
    /* 专业化的字号体系 */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */
    
    /* 字重体系 */
    --font-thin: 100;
    --font-extralight: 200;
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    --font-black: 900;
    
    /* 行高规范 */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    
    /* 字母间距 */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0em;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;
    
    /* Spacing Scale */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Theme - 企业级专业暗色模式 */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-elevated: #1e293b;
    --bg-overlay: rgba(15, 23, 42, 0.95);
    
    --text-primary: #f8fafc;
    --text-secondary: #e2e8f0;
    --text-tertiary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    
    --border-color: #334155;
    --border-light: #475569;
    --border-medium: #64748b;
    --border-dark: #94a3b8;
    
    /* 暗色模式下的专业色彩调整 */
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-active: #93c5fd;
    --primary-light: #1e3a8a;
    
    --secondary-color: #38bdf8;
    --secondary-hover: #7dd3fc;
    --secondary-active: #bae6fd;
    --secondary-light: #083344;
    
    --accent-color: #a78bfa;
    --accent-hover: #c4b5fd;
    --accent-active: #ddd6fe;
    --accent-light: #4c1d95;
    
    --success-color: #34d399;
    --success-hover: #6ee7b7;
    --success-active: #a7f3d0;
    --success-light: #064e3b;
    
    --warning-color: #fbbf24;
    --warning-hover: #fcd34d;
    --warning-active: #fde68a;
    --warning-light: #78350f;
    
    --danger-color: #f87171;
    --danger-hover: #fca5a5;
    --danger-active: #fecaca;
    --danger-light: #7f1d1d;
}

/* 企业级信息架构和视觉层次 */

/* 页面章节样式 */
.section {
    padding: var(--spacing-16) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
}

.section-subtitle {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: 0;
}

.section-alt {
    background-color: var(--bg-secondary);
}

/* 英雄区域优化 */
.hero-section {
    position: relative;
    padding: var(--spacing-20) 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, var(--primary-light) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, var(--secondary-light) 0%, transparent 50%);
    opacity: 0.3;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    align-items: center;
}

.hero-text {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    margin-bottom: var(--spacing-6);
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
    color: var(--text-primary);
    line-height: var(--leading-tight);
    margin-bottom: var(--spacing-6);
    letter-spacing: var(--tracking-tight);
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-8);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

/* CTA区域优化 */
.cta-section {
    padding: var(--spacing-20) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    z-index: 0;
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    margin-bottom: var(--spacing-4);
    letter-spacing: var(--tracking-tight);
}

.cta-description {
    font-size: var(--text-xl);
    opacity: 0.9;
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-8);
}

.cta-actions {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* 视觉引导元素 */
.divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: var(--spacing-12) 0;
}

.divider-dashed {
    height: 2px;
    background: repeating-linear-gradient(
        to right,
        var(--border-color),
        var(--border-color) 4px,
        transparent 4px,
        transparent 8px
    );
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-6);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    color: var(--text-muted);
}

.breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-sm);
}

.breadcrumb-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: var(--font-medium);
}

/* 加载指示器 */
.loading-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

.loading-content {
    text-align: center;
    padding: var(--spacing-8);
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

/* 实用工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-white { color: white; }

.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }

.rounded { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-xs { box-shadow: var(--shadow-xs); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

.leading-tight { line-height: var(--leading-tight); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }

.tracking-tight { letter-spacing: var(--tracking-tight); }
.tracking-normal { letter-spacing: var(--tracking-normal); }
.tracking-wide { letter-spacing: var(--tracking-wide); }

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

.transition-all { transition: var(--transition-md); }
.transform { transform: translateZ(0); }

.hover\:scale-105:hover { transform: scale(1.05); }
.hover\:shadow-lg:hover { box-shadow: var(--shadow-lg); }

/* 响应式工具类 */
@media (max-width: 767px) {
    .sm\:hidden { display: none; }
    .sm\:block { display: block; }
    .sm\:text-center { text-align: center; }
}

@media (min-width: 768px) {
    .md\:hidden { display: none; }
    .md\:block { display: block; }
    .md\:flex { display: flex; }
    .md\:grid { display: grid; }
    .md\:text-left { text-align: left; }
}

@media (min-width: 1024px) {
    .lg\:hidden { display: none; }
    .lg\:block { display: block; }
    .lg\:flex { display: flex; }
    .lg\:grid { display: grid; }
}
.header-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: var(--bg-overlay);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-lg);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .header-nav {
    background: var(--bg-overlay);
    box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.2);
}

.header-nav.scrolled {
    background: var(--bg-overlay);
    box-shadow: var(--shadow-md);
    transform: translateY(0);
}

[data-theme="dark"] .header-nav.scrolled {
    background: var(--bg-overlay);
    box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.3);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-5) var(--spacing-8);
    height: 72px;
    max-width: 1400px;
    margin: 0 auto;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: var(--font-bold);
    transition: var(--transition-sm);
}

.brand-link:hover {
    color: var(--primary-color);
    transform: translateY(-1px);
}

.brand-logo {
    width: 36px;
    height: 36px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.125rem;
    box-shadow: var(--shadow-md);
}

.brand-title {
    font-size: var(--text-xl);
    font-weight: var(--font-extrabold);
    margin: 0;
    letter-spacing: var(--tracking-tight);
}

.brand-subtitle {
    font-size: var(--text-xs);
    color: var(--text-muted);
    font-weight: var(--font-medium);
    display: block;
    margin-top: var(--spacing-1);
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    text-decoration: none;
    color: inherit;
    transition: var(--transition-md);
    cursor: pointer;
    position: relative;
}

.brand-link:hover {
    transform: translateY(-1px);
    color: inherit;
}

.brand-link:hover .brand-logo {
    transform: rotate(5deg) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.brand-logo {
    width: 50px;
    height: 50px;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-lg);
    position: relative;
    overflow: hidden;
}

.brand-logo::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    transition: var(--transition-lg);
}

.brand-link:hover .brand-logo::before {
    animation: shine 0.8s ease;
}

@keyframes shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

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

.brand-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.5px;
}

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

/* Enhanced Animation Effects */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: translate3d(0, 0, 0);
    }
    40%, 43% {
        transform: translate3d(0, -10px, 0);
    }
    70% {
        transform: translate3d(0, -5px, 0);
    }
    90% {
        transform: translate3d(0, -2px, 0);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

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

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

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes zoomOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.8);
    }
}

/* Enhanced Interactive Feedback */
.button-feedback {
    position: relative;
    overflow: hidden;
}

.button-feedback::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.button-feedback:active::after {
    width: 300px;
    height: 300px;
}

/* Smooth Loading States */
.loading-state {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading-state::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Enhanced Hover Effects */
.hover-lift {
    transition: var(--transition-lg);
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.hover-scale {
    transition: var(--transition-md);
}

.hover-scale:hover {
    transform: scale(1.05);
}

.hover-rotate {
    transition: var(--transition-lg);
}

.hover-rotate:hover {
    transform: rotate(5deg);
}

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

/* Enhanced Focus Styles for Accessibility */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Custom Selection Styles */
::selection {
    background: var(--primary-gradient);
    color: white;
}

::-moz-selection {
    background: var(--primary-gradient);
    color: white;
}

/* 企业级排版系统 */
body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* 标题层级规范 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: var(--spacing-4);
}

h1 {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    letter-spacing: var(--tracking-tight);
}

h2 {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-tight);
}

h3 {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
}

h4 {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
}

h5 {
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
}

h6 {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
}

/* 段落和文本元素 */
p {
    margin-top: 0;
    margin-bottom: var(--spacing-4);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

/* 链接样式 */
a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: var(--font-medium);
    transition: var(--transition-sm);
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* 强调文本 */
strong, b {
    font-weight: var(--font-bold);
    color: var(--text-primary);
}

em, i {
    font-style: italic;
}

/* 引用文本 */
blockquote {
    margin: var(--spacing-6) 0;
    padding: var(--spacing-4) var(--spacing-6);
    border-left: 4px solid var(--primary-color);
    background-color: var(--bg-secondary);
    font-size: var(--text-lg);
    font-style: italic;
    color: var(--text-secondary);
}

blockquote p:last-child {
    margin-bottom: 0;
}

/* 代码文本 */
code {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    background-color: var(--bg-tertiary);
    color: var(--accent-color);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

pre {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    overflow-x: auto;
}

pre code {
    background: none;
    border: none;
    padding: 0;
    color: inherit;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-8);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-10);
    }
}

/* 企业级网格系统 */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Flexbox布局工具类 */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

/* 间距系统优化 */
.m-0 { margin: 0; }
.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-3 { margin: var(--spacing-3); }
.m-4 { margin: var(--spacing-4); }
.m-5 { margin: var(--spacing-5); }
.m-6 { margin: var(--spacing-6); }
.m-8 { margin: var(--spacing-8); }

.mx-auto { margin-left: auto; margin-right: auto; }
.my-0 { margin-top: 0; margin-bottom: 0; }
.my-2 { margin-top: var(--spacing-2); margin-bottom: var(--spacing-2); }
.my-4 { margin-top: var(--spacing-4); margin-bottom: var(--spacing-4); }
.my-6 { margin-top: var(--spacing-6); margin-bottom: var(--spacing-6); }
.my-8 { margin-top: var(--spacing-8); margin-bottom: var(--spacing-8); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-5 { padding: var(--spacing-5); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

.py-2 { padding-top: var(--spacing-2); padding-bottom: var(--spacing-2); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }
.py-6 { padding-top: var(--spacing-6); padding-bottom: var(--spacing-6); }
.py-8 { padding-top: var(--spacing-8); padding-bottom: var(--spacing-8); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }
.px-6 { padding-left: var(--spacing-6); padding-right: var(--spacing-6); }
.px-8 { padding-left: var(--spacing-8); padding-right: var(--spacing-8); }

/* 响应式断点优化 */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .grid {
        gap: var(--spacing-4);
    }
    
    .sm\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .container {
        max-width: 768px;
    }
}

@media (min-width: 1024px) and (max-width: 1199px) {
    .container {
        max-width: 1024px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1200px;
    }
    
    .xl\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .xl\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Enhanced Navigation */
.main-navigation {
    display: flex;
}

.nav-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: var(--spacing-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: var(--transition-md);
    position: relative;
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: calc(var(--spacing-4) * -1);
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
}

/* Enhanced Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.theme-switcher {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    position: relative;
    overflow: hidden;
}

.theme-switcher:hover {
    background: var(--primary-gradient);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.theme-switcher::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: var(--transition-md);
}

.theme-switcher:hover::before {
    transform: translateX(100%);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: var(--transition-md);
    position: relative;
    overflow: hidden;
}

.mobile-menu-toggle:hover {
    background: var(--primary-gradient);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: var(--transition-md);
}

.mobile-menu-toggle:hover::before {
    transform: translateX(100%);
}

.hamburger-line {
    width: 20px;
    height: 2px;
    background: var(--text-secondary);
    transition: var(--transition-md);
    border-radius: var(--radius-full);
}

.mobile-menu-toggle:hover .hamburger-line {
    background: white;
}

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

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

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

/* Enhanced Hero Banner */
.hero-banner {
    padding: 8rem 0 6rem;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    position: relative;
    overflow: hidden;
    isolation: isolate;
}

[data-theme="dark"] .hero-banner {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 30%, rgba(255, 107, 107, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(78, 205, 196, 0.05) 0%, transparent 40%);
    pointer-events: none;
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.hero-badge::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: var(--transition-lg);
}

.hero-badge:hover::before {
    left: 100%;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.gradient-text::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    opacity: 0.7;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-8);
    border-radius: var(--radius-xl);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-lg);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.cta-button::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: var(--transition-lg);
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button.primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-lg);
}

.cta-button.primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.cta-button.secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 2px solid var(--border-medium);
    box-shadow: var(--shadow-sm);
}

.cta-button.secondary:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: var(--bg-secondary);
}

/* Enhanced Mobile Navigation */
@media (max-width: 768px) {
    .main-navigation {
        position: fixed;
        top: 0;
        left: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-elevated);
        transition: var(--transition-lg);
        z-index: var(--z-modal);
        padding: var(--spacing-8) var(--spacing-6);
        box-shadow: var(--shadow-2xl);
        display: flex;
        flex-direction: column;
    }

    [data-theme="dark"] .main-navigation {
        background: var(--bg-elevated);
    }

    .main-navigation.mobile-active {
        left: 0;
        transform: translateZ(0);
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-4);
        padding: 0;
        margin: 0;
        height: auto;
        overflow: visible;
        flex: 1;
    }

    .nav-link {
        padding: var(--spacing-4) var(--spacing-5);
        border-radius: var(--radius-xl);
        margin-bottom: 0;
        justify-content: flex-start;
        font-size: 1rem;
        font-weight: 500;
        background: var(--bg-secondary);
        border: none;
        transition: var(--transition-lg);
        position: relative;
        color: var(--text-secondary);
        box-shadow: var(--shadow-sm);
        opacity: 0;
        transform: translateX(-20px);
        animation: slideInLeftMobile 0.4s ease forwards;
    }

    .nav-link:nth-child(1) { animation-delay: 0.1s; }
    .nav-link:nth-child(2) { animation-delay: 0.15s; }
    .nav-link:nth-child(3) { animation-delay: 0.2s; }
    .nav-link:nth-child(4) { animation-delay: 0.25s; }
    .nav-link:nth-child(5) { animation-delay: 0.3s; }

    @keyframes slideInLeftMobile {
        to {
            opacity: 1;
            transform: translateX(0);
        }
    }

    .nav-link:hover {
        background: var(--bg-tertiary);
        transform: translateX(5px);
        box-shadow: var(--shadow-md);
        color: var(--text-primary);
    }

    .nav-link.active {
        background: var(--primary-gradient);
        color: white;
        box-shadow: var(--shadow-lg);
    }

    .nav-link.active::after {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
        z-index: var(--z-modal);
        background: var(--bg-elevated);
        border-radius: var(--radius-xl);
        padding: var(--spacing-3);
        border: 1px solid var(--border-color);
        transition: var(--transition-lg);
        position: relative;
        box-shadow: var(--shadow-sm);
    }

    .mobile-menu-toggle:hover {
        background: var(--primary-gradient);
        color: white;
        border-color: transparent;
        transform: translateY(-1px);
        box-shadow: var(--shadow-md);
    }

    .mobile-menu-toggle:hover .hamburger-line {
        background: white;
    }

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

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

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

    /* Mobile menu overlay */
    .mobile-menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: calc(var(--z-modal) - 1);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-lg);
    }

    .mobile-menu-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-wrapper {
        padding: var(--spacing-3) var(--spacing-4);
    }

    .brand-logo {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .brand-title {
        font-size: 1.1rem;
    }

    .brand-subtitle {
        font-size: 0.7rem;
    }

    .theme-switcher {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .hero-banner {
        padding: 6rem 0 4rem;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
        text-align: center;
    }

    .hero-badge {
        font-size: 0.8rem;
        padding: var(--spacing-2) var(--spacing-4);
        margin-bottom: var(--spacing-4);
    }

    .hero-title {
        font-size: 2.2rem;
        line-height: 1.2;
        margin-bottom: var(--spacing-4);
    }

    .hero-description {
        font-size: 1rem;
        margin-bottom: var(--spacing-6);
        padding: 0 var(--spacing-4);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-3);
    }

    .cta-button {
        padding: var(--spacing-4) var(--spacing-8);
        font-size: 0.9rem;
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .container {
        padding: 0 var(--spacing-4);
    }
}

/* Extra Small Screens */
@media (max-width: 480px) {
    .main-navigation {
        width: 100%;
        left: -100%;
        padding: var(--spacing-6) var(--spacing-4);
    }

    .nav-wrapper {
        padding: var(--spacing-2) var(--spacing-3);
    }

    .brand-logo {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

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

    .brand-subtitle {
        font-size: 0.65rem;
    }

    .theme-switcher {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .mobile-menu-toggle {
        padding: var(--spacing-2);
    }

    .nav-link {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: 0.9rem;
    }

    .nav-list {
        gap: var(--spacing-2);
    }

    .hero-banner {
        padding: 5rem 0 3rem;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-description {
        font-size: 0.9rem;
        padding: 0 var(--spacing-2);
    }

    .hero-badge {
        font-size: 0.75rem;
        padding: var(--spacing-1) var(--spacing-3);
    }

    .cta-button {
        padding: var(--spacing-3) var(--spacing-6);
        font-size: 0.85rem;
    }

    .container {
        padding: 0 var(--spacing-3);
    }

    /* Touch-friendly improvements */
    .nav-link,
    .tool-button,
    .cta-button {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Prevent zoom on input focus */
    input[type="text"],
    input[type="number"],
    input[type="color"],
    textarea {
        font-size: 16px;
    }
}

/* Landscape Orientation on Mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .hero-banner {
        padding: 4rem 0 2rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-4);
    }

    .hero-actions {
        flex-direction: row;
        gap: var(--spacing-4);
    }

    .cta-button {
        width: auto;
        max-width: none;
    }
}

/* Tablet Specific Optimizations */
@media (min-width: 768px) and (max-width: 1024px) {
    .hero-content {
        gap: var(--spacing-12);
    }

    .hero-title {
        font-size: 3rem;
    }

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-6);
    }

    .tool-item {
        padding: var(--spacing-6);
    }

    .nav-wrapper {
        padding: var(--spacing-4) var(--spacing-6);
    }
}

/* Large Screen Optimizations */
@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }

    .hero-title {
        font-size: 4rem;
    }

    .section-title {
        font-size: 3rem;
    }

    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .brand-logo,
    .tool-icon,
    .feature-icon {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Global Error Notification */
.global-error {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 9999;
    background: var(--bg-elevated);
    border: 1px solid var(--error-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(100%);
    transition: var(--transition-normal);
}

.global-error.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.error-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    color: var(--error-color);
}

.error-content i {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.error-content span {
    flex: 1;
    font-size: 0.875rem;
    line-height: 1.4;
}

.error-content button {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.error-content button:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Enhanced Accessibility Improvements */

/* Screen Reader Only Content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Skip to Main Content Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-gradient);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 10000;
    transition: var(--transition-md);
}

.skip-link:focus {
    top: 6px;
    outline: 2px solid white;
    outline-offset: 2px;
}

/* Enhanced Focus Styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

button:focus,
input:focus,
textarea:focus,
select:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .color-wheel {
        animation: none;
    }

    .tool-item,
    .feature-item,
    .nav-link {
        animation: none;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
        --bg-secondary: #ffffff;
        --border-medium: #000000;
        --border-dark: #000000;
    }

    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-secondary: #ffffff;
        --bg-secondary: #000000;
        --border-medium: #ffffff;
        --border-dark: #ffffff;
    }

    .tool-button,
    .cta-button,
    .nav-link {
        border: 2px solid currentColor;
    }
}

/* Increased Font Size Support */
@media (min-width: 1200px) {
    html {
        font-size: 18px;
    }
}

/* Dark Mode Improvements */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-elevated: #1e293b;
        
        --text-primary: #f8fafc;
        --text-secondary: #e2e8f0;
        --text-tertiary: #cbd5e1;
        --text-muted: #94a3b8;
        
        --border-color: #334155;
        --border-medium: #475569;
        --border-dark: #64748b;
    }
}

/* Enhanced Print Styles */
@media print {
    .header-nav,
    .mobile-menu-toggle,
    .theme-switcher,
    .tool-modal,
    .global-error,
    .keyboard-shortcuts {
        display: none !important;
    }

    .hero-banner,
    .tools-showcase {
        background: white !important;
        color: black !important;
    }

    .tool-item {
        break-inside: avoid;
        border: 1px solid #ccc !important;
        box-shadow: none !important;
    }

    .tool-section {
        border: 1px solid #999 !important;
    }

    .color-display-large {
        border: 2px solid #000 !important;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* Enhanced Loading States */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Enhanced Error States */
.error-state {
    border: 2px solid var(--error-color) !important;
    background-color: rgba(255, 107, 107, 0.05) !important;
}

.warning-state {
    border: 2px solid var(--warning-color) !important;
    background-color: rgba(254, 202, 87, 0.05) !important;
}

.success-state {
    border: 2px solid var(--success-color) !important;
    background-color: rgba(150, 206, 180, 0.05) !important;
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .tool-button,
    .cta-button,
    .nav-link,
    .tool-action-btn {
        min-height: 44px;
        min-width: 44px;
        padding: 12px 16px;
    }

    /* Reduce motion for touch devices */
    * {
        transition-duration: 0.1s !important;
    }

    .color-segment:hover,
    .tool-item:hover,
    .feature-item:hover {
        transform: none;
    }
}

/* Keyboard Navigation Enhancements */
.keyboard-user .tool-button:hover,
.keyboard-user .cta-button:hover,
.keyboard-user .nav-link:hover {
    outline: 2px dashed var(--primary-color);
    outline-offset: 2px;
}

/* Voice Control Support */
.voice-control {
    speak-as: normal;
    hyphens: auto;
}

/* Enhanced Form Accessibility */
input[aria-invalid="true"] {
    border-color: var(--error-color);
    box-shadow: 0 0 0 2px rgba(255, 107, 107, 0.2);
}

input[aria-invalid="false"] {
    border-color: var(--success-color);
    box-shadow: 0 0 0 2px rgba(150, 206, 180, 0.2);
}

/* ARIA Live Regions */
[aria-live="polite"] {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Enhanced Color Contrast Utilities */
.high-contrast-text {
    color: var(--text-primary) !important;
    font-weight: 600 !important;
}

.low-vision-support {
    font-size: 1.2em !important;
    line-height: 1.8 !important;
}

/* Cognitive Accessibility */
.cognitive-support {
    transition: background-color 0.3s ease;
}

.cognitive-support:focus-within {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}