/* Components - 元件樣式 */

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: 1;
    text-align: center;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    border-color: var(--color-secondary);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
    color: var(--color-white);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-white {
    background-color: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-white);
}

.btn-white:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-100);
    color: var(--color-primary);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

.btn-full {
    width: 100%;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: var(--z-fixed);
    transition: all var(--transition-normal);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    width: 100%;
    padding: 0 var(--space-8);
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 70px;
    width: 168px;
    object-fit: contain;
}

/* ===== Main Navigation ===== */
.main-nav {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

/* 選單項目之間的垂直分隔線 */
.nav-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 20px;
    background-color: var(--color-gray-900);
}

.nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    color: var(--color-gray-900);
    letter-spacing: var(--tracking-wide);
    transition: color var(--transition-fast);
    white-space: nowrap;
    letter-spacing: 0.25em;
    font-family: 'Acumin Variable Concept';
}

.nav-link:hover {
    color: var(--color-primary);
}

/* ===== Dropdown Menu ===== */
.has-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    list-style: none;
    margin: 0;
    padding: var(--space-2) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    z-index: var(--z-dropdown);
}

.has-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-base);
    color: var(--color-gray-900);
    transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
    background-color: rgba(184, 134, 11, 0.1);
    color: var(--color-primary);
}

/* ===== 二級子選單 (Submenu) ===== */
.has-submenu {
    position: relative;
}

.has-submenu > a {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.submenu {
    position: absolute;
    top: 0;
    left: 100%;
    min-width: 160px;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    list-style: none;
    margin: 0;
    padding: var(--space-2) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: all var(--transition-normal);
    z-index: var(--z-dropdown);
}

.has-submenu:hover > .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.submenu li {
    margin: 0;
}

.submenu a {
    display: block;
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-base);
    color: var(--color-gray-900);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.submenu a:hover {
    background-color: rgba(184, 134, 11, 0.1);
    color: var(--color-primary);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-list a {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    letter-spacing: var(--tracking-wide);
    transition: color var(--transition-fast);
}

.nav-list a:hover {
    color: var(--color-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    padding: 0;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-gray-900);
    transition: all var(--transition-normal);
}

.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(5px, -5px);
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: var(--space-4);
}

.form-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    color: var(--color-gray-900);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(184, 134, 11, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-400);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236c757d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.radio-group {
    display: flex;
    gap: var(--space-4);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-base);
    cursor: pointer;
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
}

/* ===== Cards ===== */
.card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card-image {
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.card-content {
    padding: var(--space-6);
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--border-radius-full);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-5px);
}

/* ===== Load More Button ===== */
.knowledge-load-more-wrapper {
    display: flex;
    justify-content: center;
    margin-top: var(--space-10);
    padding-bottom: var(--space-10);
}

.btn-load-more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    color: var(--color-primary);
    background-color: transparent;
    border: 2px solid var(--color-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
    letter-spacing: var(--tracking-wide);
}

.btn-load-more:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-load-more:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-load-more .arrow {
    font-weight: var(--font-bold);
    transition: transform var(--transition-fast);
}

.btn-load-more:hover .arrow {
    transform: translateX(3px);
}

/* ===== Header Footer Interaction States ===== */

/* Footer 可見時 Header 的狀態 */
/* 使用與向上滾動相同的 transition 效果，不使用獨立動畫 */
.header.footer-visible {
    transform: translateY(0) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* 行動裝置：選單自動展開效果 */
@media (max-width: 991px) {
    /* 自動展開的選單樣式 */
    .main-nav.auto-expanded {
        max-height: 80vh;
        opacity: 1;
        overflow-y: auto;
        animation: menuAutoExpand 0.65s cubic-bezier(0.25, 0.1, 0.25, 1);
    }
    
    @keyframes menuAutoExpand {
        0% {
            max-height: 0;
            opacity: 0;
            transform: translateY(-10px);
        }
        50% {
            opacity: 0.7;
            transform: translateY(0);
        }
        100% {
            max-height: 80vh;
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    /* 確保自動展開時漢堡選單顯示為 X 狀態 */
    .header.footer-visible .menu-toggle span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .header.footer-visible .menu-toggle span:nth-child(2) {
        opacity: 0;
    }
    
    .header.footer-visible .menu-toggle span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    /* 選單展開時的視覺提示 */
    .header.footer-visible .main-nav {
        border-top: 2px solid var(--color-accent, #D69C2D);
    }
}

/* 平板版特定調整 */
@media (min-width: 768px) and (max-width: 991px) {
    .main-nav.auto-expanded {
        padding: var(--space-4, 1rem) 0;
        animation-duration: 0.75s;
    }
}

/* 小型手機版特定調整 */
@media (max-width: 479px) {
    .main-nav.auto-expanded {
        max-height: 70vh;
        font-size: 0.9rem;
        animation-duration: 0.55s;
    }
}