/* ==================== Common CSS ==================== */
/* 公共样式文件 - MyWisdompace */

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

:root {
    /* Default values, will be overridden by theme files */
    --bg-primary: #F5E6D3;
    --bg-secondary: #E8D4B8;
    --text-primary: #3D2B1F;
    --text-secondary: #5D4A3A;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.8;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 300;
    line-height: 1.4;
}

p {
    margin-bottom: 1rem;
    text-align: justify;
    text-justify: inter-ideograph;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--accent-warm);
    color: var(--text-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(232, 200, 114, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent-warm);
    color: var(--accent-warm);
}

.btn-outline:hover {
    background: var(--accent-warm);
    color: var(--text-primary);
}

.btn-tool {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-tool:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-tool:not(:disabled):hover {
    background: var(--accent-warm);
}

/* Card Styles */
.card {
    background: var(--bg-card, #FFFFFF);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

/* Navigation Bar */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: all 0.3s ease;
}

nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 2rem;
}

.nav-item {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
    cursor: pointer;
    padding: 0.5rem 0;
}

.nav-item:hover,
.nav-item.active {
    color: var(--accent-warm);
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-warm);
    transition: width 0.3s ease;
}

.nav-item:hover::after,
.nav-item.active::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--accent-warm);
    margin: 5px 0;
    transition: 0.3s;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.loading-screen.active {
    opacity: 1;
    pointer-events: all;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--bg-secondary);
    border-top-color: var(--accent-warm);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Image Placeholder */
.image-placeholder {
    background: var(--bg-secondary);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.image-placeholder::before {
    content: '';
    display: block;
    padding-top: 56.25%; /* 16:9 aspect ratio */
}

.image-placeholder .placeholder-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-muted, #8B7355);
}

/* Animations */
.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-out {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.fade-in {
    opacity: 1;
    transition: opacity 0.3s ease;
}

/* Responsive */
@media (max-width: 767px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        transition: right 0.3s ease;
        gap: 1.5rem;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-justify { text-align: justify; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }
.my-4 { margin-top: 4rem; margin-bottom: 4rem; }
.p-4 { padding: 4rem; }
.flex { display: flex; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.grid { display: grid; }