/* ===============================================
   2-components.css - 组件层
   The Ulala Recipe - MVP v2.0
   
   职责：
   - Header + Navigation
   - Footer
   - Breadcrumb
   - Buttons（通用按钮样式）
   - Cards（基础卡片样式）
   
   特点：
   - 所有页面共用
   - 每个组件独立、可复用
   =============================================== */

/* ======================
   Header & Navigation
   ====================== */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

/* Logo */
.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--green-dark);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--green-dark);
}

.logo-subtitle {
    font-size: 11px;
    color: var(--gray-700);
    font-weight: 400;
}

/* Navigation */
.nav-list {
    display: flex;
    gap: var(--gap-md);
    list-style: none;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    font-size: 15px;
    padding: var(--gap-xs) var(--gap-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    color: var(--gray-700);
}

.nav-link:hover {
    background: var(--gray-100);
    color: var(--green-dark);
    opacity: 1;
}

.nav-link.active {
    background: var(--green-light);
    color: var(--green-dark);
    font-weight: 600;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--gap-xs);
    cursor: pointer;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--green-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* Mobile Menu States */
.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

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

/* ======================
   Breadcrumb
   ====================== */
.breadcrumb {
    background: var(--gray-100);
    padding: 16px 0;
    font-size: 14px;
    color: var(--gray-700);
}

.breadcrumb a {
    color: var(--gray-700);
}

.breadcrumb a:hover {
    color: var(--green-dark);
}

.breadcrumb .separator {
    margin: 0 8px;
    color: var(--gray-500);
}

.breadcrumb .current {
    color: var(--gray-900);
    font-weight: 500;
}

/* ======================
   Buttons - 通用按钮系统
   ====================== */

/* Primary Button */
.btn-primary {
    display: inline-block;
    padding: 14px 32px;
    background: var(--green);
    color: var(--white);
    font-weight: 600;
    font-size: 15px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--green);
    transition: var(--transition);
    text-align: center;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--green-dark);
    border-color: var(--green-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    opacity: 1;
}

/* Secondary Button */
.btn-secondary {
    display: inline-block;
    padding: 14px 32px;
    background: var(--white);
    color: var(--green-dark);
    font-weight: 600;
    font-size: 15px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--green);
    transition: var(--transition);
    text-align: center;
    cursor: pointer;
}

.btn-secondary:hover {
    background: var(--green);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    opacity: 1;
}

/* Back Button */
.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--gap-xs);
    padding: 12px 24px;
    background: var(--white);
    border: 2px solid var(--green);
    border-radius: var(--radius-sm);
    color: var(--green-dark);
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
}

.back-button:hover {
    background: var(--green);
    color: var(--white);
    opacity: 1;
}

.back-to-list,
.back-to-products {
    text-align: center;
    margin: var(--gap-xl) 0;
}

/* Copy Button */
.copy-button {
    background: var(--green);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.copy-button:hover {
    background: var(--green-dark);
    opacity: 1;
}

/* ======================
   Cards - 基础卡片系统
   ====================== */

/* Base Card - 所有卡片继承 */
.card-base {
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    padding: var(--gap-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

/* Card Hover Effect */
.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--green-light);
}

/* Card with Left Border */
.card-border-left {
    border-left: 4px solid var(--gray-300);
}

.card-border-left.green {
    border-left-color: var(--green);
}

.card-border-left.gray {
    border-left-color: var(--gray-500);
}

.card-border-left.dark {
    border-left-color: var(--gray-700);
}

/* ======================
   Footer
   ====================== */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: var(--gap-xl) 0 var(--gap-lg);
    margin-top: var(--gap-2xl);
}

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

.footer-brand {
    margin-bottom: var(--gap-lg);
}

.footer-logo {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--green);
    margin-bottom: var(--gap-xs);
}

.footer-tagline {
    font-size: var(--text-sm);
    color: #bbb;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--gap-md);
    margin-bottom: var(--gap-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--white);
    font-size: var(--text-sm);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--green);
    opacity: 1;
}

.footer-separator {
    color: #666;
}

.footer-email {
    color: #bbb;
    font-size: var(--text-sm);
}

.footer-copyright {
    font-size: var(--text-xs);
    color: #888;
    margin-top: var(--gap-md);
}

/* ======================
   Responsive - Mobile Adjustments
   ====================== */

@media (max-width: 767px) {
    /* Mobile Navigation */
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        border-top: 1px solid var(--gray-300);
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
        z-index: 99;
        pointer-events: none;
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-list {
        flex-direction: column;
        padding: var(--gap-lg);
        gap: 0;
    }
    
    .nav-link {
        display: block;
        padding: var(--gap-md) 0;
        border-bottom: 1px solid var(--gray-100);
        text-align: center;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    /* Footer */
    .footer-links {
        flex-direction: column;
        gap: var(--gap-sm);
    }
    
    .footer-separator {
        display: none;
    }
}

/* ======================
   Details/Summary - 折叠组件
   ====================== */
details {
    margin: var(--gap-md) 0;
}

summary {
    cursor: pointer;
    list-style: none;
    user-select: none;
}

summary::-webkit-details-marker {
    display: none;
}

.details-trigger {
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    padding: var(--gap-md);
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.details-trigger:hover {
    border-color: var(--green);
    background: var(--green-light);
}

.details-trigger::after {
    content: '▼';
    color: var(--green);
    font-size: 12px;
    transition: transform 0.3s;
}

details[open] .details-trigger::after {
    transform: rotate(180deg);
}

.details-content {
    padding: var(--gap-lg);
    border: 1px solid var(--gray-300);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
    margin-top: -1px;
    background: var(--white);
}

/* Large variant */
.details-trigger-large {
    cursor: pointer;
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    padding: 20px;
    font-weight: 600;
    font-size: 16px;
    text-align: center;
    list-style: none;
    transition: var(--transition);
    display: block;
    width: 100%;
    color: var(--gray-900);
}

.details-trigger-large:hover {
    border-color: var(--green);
    background: var(--green-light);
}

.details-trigger-large::before {
    content: '▼ ';
    color: var(--green);
    margin-right: 8px;
    font-size: 12px;
    transition: transform 0.3s;
    display: inline-block;
}

details[open] .details-trigger-large::before {
    transform: rotate(180deg);
}

/* ======================
   Tags - 标签组件
   ====================== */
.tag {
    display: inline-block;
    padding: 6px 12px;
    background: var(--green-light);
    color: var(--green-dark);
    border-radius: var(--radius-lg);
    font-size: var(--text-xs);
    font-weight: 600;
    transition: var(--transition);
}

.tag:hover {
    background: var(--green);
    color: var(--white);
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap-xs);
}

/* ======================
   Loading States
   ====================== */
.loading {
    opacity: 0.6;
    pointer-events: none;
    cursor: not-allowed;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-300);
    border-top-color: var(--green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

/* Focus States */
a:focus,
button:focus,
summary:focus {
    outline: 2px solid var(--green);
    outline-offset: 2px;
}

/* Skip to Content */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--green);
    color: var(--white);
    padding: 8px 16px;
    text-decoration: none;
    z-index: 1000;
}

.skip-to-content:focus {
    top: 0;
}