/**
 * 前台自訂 CSS - 科技創新風格
 * Tech Innovation Style
 */

/* ==================== CSS 變數定義 ==================== */
:root {
    /* 主色調 - 科技藍到紫色漸層 */
    --primary-blue: #2563EB;
    --primary-purple: #7C3AED;
    --gradient-primary: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);

    /* 輔助色 */
    --secondary-cyan: #06B6D4;
    --secondary-pink: #EC4899;
    --secondary-orange: #F59E0B;

    /* 中性色 */
    --neutral-dark: #1F2937;
    --neutral-gray: #6B7280;
    --neutral-light: #F3F4F6;
    --neutral-white: #FFFFFF;

    /* 間距系統 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* 圓角系統 */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* 陰影系統 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-tech: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-tech-hover: 0 15px 40px rgba(37, 99, 235, 0.2);

    /* 字體 */
    --font-chinese: 'Noto Sans TC', sans-serif;
    --font-english: 'Poppins', sans-serif;
}

/* ==================== 全域樣式 ==================== */
.frontend-body {
    font-family: var(--font-chinese);
    color: var(--neutral-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}

/* ==================== 漸層背景類別 ==================== */
.gradient-bg {
    background: var(--gradient-primary);
    background-size: 200% 200%;
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.gradient-bg-light {
    background: linear-gradient(135deg, #EFF6FF 0%, #F5F3FF 100%);
}

.gradient-bg-dark {
    background: linear-gradient(135deg, #1E3A8A 0%, #5B21B6 100%);
}

.gradient-hero {
    background: linear-gradient(135deg, #2563EB 0%, #7C3AED 50%, #EC4899 100%);
    background-size: 200% 200%;
    animation: gradientShift 10s ease infinite;
}

/* ==================== 圓角卡片類別 ==================== */
.card-tech {
    background: var(--neutral-white);
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: var(--shadow-tech);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

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

.card-tech.card-hovered {
    transform: translateY(-8px);
    box-shadow: var(--shadow-tech-hover);
}

.card-tech .card-img-top {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    object-fit: cover;
}

.card-tech .card-body {
    padding: var(--spacing-md);
}

.card-tech .card-title {
    font-family: var(--font-english);
    font-weight: 600;
    color: var(--neutral-dark);
    margin-bottom: var(--spacing-sm);
}

.card-tech .card-text {
    color: var(--neutral-gray);
    line-height: 1.6;
}

/* ==================== 按鈕漸層類別 ==================== */
.btn-gradient {
    background: var(--gradient-primary);
    background-size: 200% 200%;
    border: none;
    color: var(--neutral-white);
    padding: 0.75rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    animation: gradientShift 5s ease infinite;
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
    color: var(--neutral-white);
}

.btn-gradient:active {
    transform: translateY(0);
}

.btn-gradient .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    transform: scale(0);
    animation: rippleEffect 0.6s ease-out;
}

@keyframes rippleEffect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.btn-gradient-secondary {
    background: linear-gradient(135deg, #06B6D4 0%, #2563EB 100%);
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
}

.btn-gradient-accent {
    background: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
}

/* ==================== 毛玻璃效果類別 ==================== */
.glass-effect {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.glass-effect-dark {
    background: rgba(31, 41, 55, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==================== 陰影深度類別 ==================== */
.shadow-tech {
    box-shadow: var(--shadow-tech);
}

.shadow-tech-hover:hover {
    box-shadow: var(--shadow-tech-hover);
}

.shadow-sm {
    box-shadow: var(--shadow-sm);
}

.shadow-md {
    box-shadow: var(--shadow-md);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.shadow-xl {
    box-shadow: var(--shadow-xl);
}

/* ==================== Navbar 樣式 ==================== */
.navbar-fixed-top {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1030;
    transition: all 0.3s ease;
}

.navbar-fixed-top.navbar-scrolled {
    box-shadow: var(--shadow-md);
}

.navbar-brand .brand-text {
    font-family: var(--font-english);
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    font-weight: 500;
    color: var(--neutral-dark);
    transition: all 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* ==================== Footer 樣式 ==================== */
.footer {
    background: linear-gradient(135deg, #1E3A8A 0%, #5B21B6 100%);
    color: var(--neutral-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

.footer-heading {
    font-family: var(--font-english);
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--gradient-primary);
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.social-links {
    margin-top: var(--spacing-md);
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--neutral-white);
    margin-right: var(--spacing-xs);
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--gradient-primary);
    transform: translateY(-3px);
    color: var(--neutral-white);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--neutral-white);
    padding-left: 5px;
}

.footer-contact,
.footer-hours {
    list-style: none;
    padding: 0;
    margin: 0;
    color: rgba(255, 255, 255, 0.8);
}

.footer-contact li,
.footer-hours li {
    margin-bottom: var(--spacing-sm);
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.2);
    margin: var(--spacing-lg) 0;
}

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ==================== 主要內容區域 ==================== */
.main-content {
    margin-top: 70px; /* Navbar 高度 */
    min-height: calc(100vh - 70px - 300px); /* 視窗高度 - navbar - footer */
}

/* ==================== 表單樣式 ==================== */
.form-control {
    border-radius: var(--radius-md);
    border: 2px solid var(--neutral-light);
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
}

.input-focused .form-control {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
}

/* ==================== 響應式設計 ==================== */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }

    .navbar-collapse.show {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--neutral-white);
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }

    .card-tech {
        margin-bottom: var(--spacing-md);
    }

    .footer {
        padding: var(--spacing-lg) 0 var(--spacing-md);
    }

    .social-link {
        margin-bottom: var(--spacing-xs);
    }
}

@media (max-width: 576px) {
    .btn-gradient {
        padding: 0.6rem 1.5rem;
        font-size: 0.875rem;
    }

    .card-tech .card-body {
        padding: var(--spacing-sm);
    }
}

/* ==================== 動畫效果 ==================== */
.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

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

/* ==================== 工具類別 ==================== */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient {
    background: var(--gradient-primary);
}

.rounded-tech {
    border-radius: var(--radius-lg);
}

/* ==================== 回到頂部按鈕（已停用） ==================== */
.scroll-top {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
}