/* Reset & Base Styles */
:root {
    /* Color System */
    --primary-color: #2563eb;
    --primary-light: #60a5fa;
    --primary-dark: #1e40af;
    --secondary-color: #8b5cf6;
    --secondary-light: #a78bfa;
    --secondary-dark: #6d28d9;
    
    /* Neutral Colors */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-tertiary: #e5e7eb;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Layout */
    --container-width: min(100%, 1024px);
    --container-padding: var(--space-sm);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index */
    --z-below: -1;
    --z-normal: 1;
    --z-above: 10;
    --z-modal: 100;
    --z-tooltip: 1000;
}

/* Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: none;
    height: 100%;
    scroll-behavior: smooth;
}

body {
    width: 100%;
    min-height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Common Components */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Navigation */
.nav-bar {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto var(--space-xl);
    padding: var(--space-sm);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.nav-bar-item-title {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    text-decoration: none;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-bar-item-title:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* 平板和小屏幕设备的导航栏样式 */
@media (max-width: 768px) {
    .nav-bar {
        gap: var(--space-xs);
        margin-bottom: var(--space-lg);
    }
    
    .nav-bar-item-title {
        font-size: var(--font-size-sm);
        padding: calc(var(--space-xs) / 1.5) var(--space-xs);
    }
}

/* 手机设备的导航栏样式 */
@media (max-width: 480px) {
    .nav-bar {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        gap: calc(var(--space-xs) / 2);
        width: 100%;
        padding: calc(var(--space-xs) / 2);
        margin-bottom: var(--space-md);
    }
    
    .nav-bar-item-title {
        font-size: calc(var(--font-size-sm) * 0.9);
        padding: calc(var(--space-xs) / 2) var(--space-xs);
        text-align: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}

/* Avatar */
.avatar {
    width: clamp(80px, 15vw, 120px);
    height: clamp(80px, 15vw, 120px);
    border-radius: var(--radius-full);
    object-fit: cover;
    transition: transform var(--transition-normal);
    margin-bottom: var(--space-lg);
}

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

/* Tag Cloud */
.tag-cloud {
    width: 100%;
    max-width: var(--container-width);
    margin: var(--space-xl) 0;
    padding: var(--space-md);
}

.tag-cloud-title {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.tag-cloud-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
}

.tag-cloud-tags a {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.tag-cloud-tags a:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    width: 100%;
    padding: var(--space-lg);
    text-align: center;
    margin-top: auto;
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--primary-dark);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Calendar Components */
.floating-calendar {
    position: fixed;
    right: max(var(--space-md), 4vw);
    bottom: max(var(--space-md), 4vw);
    z-index: 1000;
}

.calendar-toggle {
    width: clamp(3rem, 8vw, 4rem);
    height: clamp(3rem, 8vw, 4rem);
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    border: none;
    color: white;
    font-size: var(--font-size-xl);
    transition: all var(--transition-normal);
    user-select: none;
}

.calendar-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(37, 99, 235, 0.3);
}

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

.calendar-content {
    position: absolute;
    right: 0;
    bottom: 100%;
    margin-bottom: var(--space-sm);
    width: min(calc(100vw - 2rem), 320px);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-md);
    display: none;
    transform-origin: bottom right;
    border: 1px solid var(--bg-tertiary);
    opacity: 0;
    transform: translateY(10px) scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

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

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
    font-weight: 600;
}

.weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
    text-align: center;
    font-weight: 500;
    color: var(--text-secondary);
}

.days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--space-xs);
}

.days span {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 2rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.days span:empty {
    cursor: default;
}

.days span:not(:empty):hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.days span:not(:empty):active {
    transform: translateY(0);
}

.days span.current {
    background: var(--primary-color);
    color: white;
    font-weight: bold;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #111827;
        --bg-secondary: #1f2937;
        --bg-tertiary: #374151;
        --text-primary: #f3f4f6;
        --text-secondary: #d1d5db;
        --text-tertiary: #9ca3af;
        --primary-color: #3b82f6;
        --primary-light: #60a5fa;
        --primary-dark: #2563eb;
        --secondary-color: #8b5cf6;
        --secondary-light: #a78bfa;
        --secondary-dark: #7c3aed;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    }
}

/* Performance Optimizations */
@media (hover: hover) {
    .nav-bar-item-title,
    .tag-cloud-tags a,
    .calendar-toggle {
        will-change: transform;
    }
}