/* ==================================================
   ChemCustom - Modern Scientific Design System
   High-Tech & Professional Styling
   ================================================== */

:root {
    --color-primary: #7C8A9F;        /* 灰蓝色 - 主色 */
    --color-secondary: #6B7585;      /* 中灰色 - 辅助色 */
    --color-accent: #8FA8B8;         /* 淡青灰 - 强调色 */
    --color-success: #7DA59B;        /* 灰绿 - 成功色 */
    --color-danger: #D46B7B;         /* 柔和红 - 警告色 */
    --color-text-primary: #E0E4E8;   /* 浅灰 - 主文字 */
    --color-text-secondary: #B0B8C0; /* 中灰 - 次要文字 */
    --color-bg-primary: #1E2329;     /* 深灰 - 背景 */
    --color-bg-card: #2A3038;        /* 稍浅灰 - 卡片背景 */
    --color-bg-white: #343B45;       /* 更浅灰 - 白色替代 */
    --color-border: #3D4550;         /* 深灰 - 边框 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px 0 rgba(0, 0, 0, 0.45);
    --shadow-xl: 0 12px 32px 0 rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================================================
   Global Styles & Typography
   ================================================== */

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 400;
}

/* Headings - Professional & Clear */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', system-ui, -apple-system, sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    scroll-margin-top: 80px;
}

h1 { font-size: 3.5rem; margin-bottom: 1.5rem; }
h2 { font-size: 2.25rem; margin-bottom: 1.5rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
}

/* Readable body text */
p {
    line-height: 1.75;
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

/* Links */
a {
    transition: var(--transition);
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: none;
    color: var(--color-secondary);
}

/* ==================================================
   Custom Scrollbar
   ================================================== */

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

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-secondary);
}

/* ==================================================
   Markdown Content Styling
   ================================================== */

.markdown-content {
    line-height: 1.8;
}

.markdown-content h1 { 
    font-size: 2.25em; 
    margin: 1.5em 0 0.75em 0; 
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 0.5em;
}

.markdown-content h2 { 
    font-size: 1.8em; 
    margin: 1.25em 0 0.75em 0;
    color: var(--color-primary);
}

.markdown-content h3 { 
    font-size: 1.5em; 
    margin: 1em 0 0.5em 0;
    color: var(--color-text-primary);
}

.markdown-content h4 {
    font-size: 1.25em;
    margin: 0.8em 0 0.4em 0;
}

.markdown-content p { 
    line-height: 1.8; 
    margin: 0.8em 0;
    color: var(--color-text-secondary);
}

.markdown-content strong { 
    font-weight: 700;
    color: var(--color-primary);
}

.markdown-content em { 
    font-style: italic;
    color: var(--color-secondary);
}

.markdown-content ul, .markdown-content ol { 
    margin: 1em 0 1em 2em;
}

.markdown-content li { 
    margin: 0.5em 0;
    line-height: 1.75;
}

.markdown-content blockquote { 
    border-left: 4px solid var(--color-accent);
    padding: 0.75em 1.25em;
    color: var(--color-text-secondary);
    margin: 1.25em 0;
    background-color: rgba(143, 168, 184, 0.1);
    border-radius: 0.25rem;
    font-style: italic;
}

.markdown-content table { 
    border-collapse: collapse; 
    width: 100%; 
    margin: 1.5em 0;
    box-shadow: var(--shadow-sm);
    border-radius: 0.5rem;
    overflow: hidden;
}

.markdown-content th, .markdown-content td { 
    border: 1px solid var(--color-border);
    padding: 0.75em;
    text-align: left;
}

.markdown-content th { 
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    font-weight: 700;
}

.markdown-content tr:nth-child(even) {
    background-color: rgba(42, 48, 56, 0.5);
}

.markdown-content tr:hover {
    background-color: rgba(124, 138, 159, 0.15);
}

.markdown-content code { 
    background-color: rgba(52, 59, 69, 0.8);
    color: var(--color-accent);
    padding: 0.2em 0.4em;
    border-radius: 0.25rem;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    border: 1px solid var(--color-border);
}

.markdown-content pre { 
    background: linear-gradient(135deg, #2A3038 0%, #1E2329 100%);
    color: #E0E4E8;
    padding: 1.25em;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 1.25em 0;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(143, 168, 184, 0.2);
}

.markdown-content pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
    border: none;
}

/* ==================================================
   Product Card Styling
   ================================================== */

.product-item {
    transition: var(--transition);
    border-radius: 0.75rem;
}

.product-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ==================================================
   Input & Form Elements
   ================================================== */

#search-input,
#category-filter {
    color: var(--color-text-primary) !important;
    background-color: var(--color-bg-white) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: 0.5rem !important;
    transition: var(--transition) !important;
    padding: 0.75rem 1rem !important;
    font-size: 0.95rem !important;
}

#search-input:focus,
#category-filter:focus {
    outline: none !important;
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 3px rgba(0, 119, 182, 0.1) !important;
}

#search-input::placeholder {
    color: var(--color-text-secondary) !important;
}

#category-filter option {
    color: var(--color-text-primary) !important;
    background-color: var(--color-bg-white) !important;
}

/* ==================================================
   Animations & Transitions
   ================================================== */

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px rgba(124, 138, 159, 0.3);
    }
    50% {
        box-shadow: 0 0 20px rgba(124, 138, 159, 0.6);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out;
}

.animate-slideInLeft {
    animation: slideInLeft 0.6s ease-out;
}

.animate-glow {
    animation: glow 2s ease-in-out infinite;
}

/* ==================================================
   Utility Classes
   ================================================== */

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.border-accent {
    border-color: var(--color-accent) !important;
}

/* ==================================================
   Responsive Design
   ================================================== */

@media (max-width: 768px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.1rem; }
    
    .markdown-content h1 { font-size: 1.75em; }
    .markdown-content h2 { font-size: 1.5em; }
    .markdown-content h3 { font-size: 1.25em; }
}

@media (max-width: 480px) {
    p, .markdown-content p {
        font-size: 0.95rem;
    }
}

/* ==================================================
   Accessibility
   ================================================== */

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

/* ==================================================
   Print Styles
   ================================================== */

@media print {
    nav,
    footer,
    .no-print {
        display: none;
    }
}