/* ========================================
   CSS Reset & Base Styles
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #1a4d7a;
    --primary-dark: #0f3554;
    --secondary-color: #ff6b35;
    --accent-color: #f7931e;
    --text-dark: #1a1a1a;
    --text-medium: #4a4a4a;
    --text-light: #6a6a6a;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 80px;
    --card-padding: 30px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

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

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

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: #e55a2b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-lg {
    padding: 16px 36px;
    font-size: 1.1rem;
}

.btn-link {
    color: var(--primary-color);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-link:hover {
    color: var(--secondary-color);
}

/* ========================================
   Navigation Bar
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-cta-mobile {
    display: none;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: all var(--transition-normal);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    padding-top: 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><rect fill="%231a4d7a" width="1200" height="600"/><g fill="%23ffffff" fill-opacity="0.03"><polygon points="1200 0 0 0 0 600"/></g></svg>');
    opacity: 0.5;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255, 107, 53, 0.1), transparent);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    color: white;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1rem;
    font-weight: 300;
    margin-bottom: 16px;
    opacity: 0.9;
}

.hero-title {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 40px;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-features {
    display: flex;
    gap: 40px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.feature-icon:hover {
    background-color: var(--secondary-color);
    transform: translateY(-4px);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.feature-item p {
    font-size: 0.95rem;
    font-weight: 500;
    margin: 0;
}

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

/* ========================================
   Section Common Styles
   ======================================== */

section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 20px auto 0;
}

/* ========================================
   Services Section
   ======================================== */

.services {
    background-color: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: var(--card-padding);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.service-icon svg {
    color: white;
}

.service-title {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.service-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.service-detail h4 {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-weight: 600;
}

.service-detail p {
    color: var(--text-medium);
    line-height: 1.6;
    margin: 0;
}

.service-detail ul {
    list-style: none;
    padding: 0;
}

.service-detail ul li {
    color: var(--text-medium);
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
}

.service-detail ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* ========================================
   Capabilities Section
   ======================================== */

.capabilities-content {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.equipment-info h3,
.processing-range h3,
.quality-control h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--secondary-color);
}

.equipment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.equipment-item {
    background-color: var(--bg-light);
    border-radius: 12px;
    padding: 30px;
    border-left: 4px solid var(--secondary-color);
}

.equipment-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.equipment-header svg {
    color: var(--primary-color);
}

.equipment-header h4 {
    font-size: 1.3rem;
    margin: 0;
}

.equipment-spec {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.equipment-note {
    color: var(--text-light);
    font-size: 0.95rem;
}

.range-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.range-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background-color: var(--bg-light);
    border-radius: 8px;
}

.range-item svg {
    color: var(--secondary-color);
    flex-shrink: 0;
    margin-top: 4px;
}

.quality-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.quality-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background-color: var(--bg-light);
    border-radius: 8px;
}

.quality-item svg {
    color: var(--secondary-color);
    flex-shrink: 0;
}

/* ========================================
   Workflow Section
   ======================================== */

.workflow {
    background-color: var(--bg-light);
}

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.workflow-step {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
}

.workflow-step:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.step-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--secondary-color);
    opacity: 0.2;
    position: absolute;
    top: 20px;
    right: 20px;
    line-height: 1;
}

.step-content {
    position: relative;
    z-index: 1;
}

.step-content h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-medium);
    line-height: 1.6;
    margin: 0;
}

/* ========================================
   FAQ Section
   ======================================== */

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.faq-item {
    background-color: var(--bg-light);
    border-radius: 12px;
    padding: 30px;
    border-top: 4px solid var(--secondary-color);
    transition: all var(--transition-normal);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.faq-item h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.faq-item p {
    color: var(--text-medium);
    line-height: 1.6;
    margin: 0;
}

/* ========================================
   About Section
   ======================================== */

.about {
    background-color: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    align-items: start;
}

.about-text h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 30px;
    margin-bottom: 16px;
}

.about-text p {
    color: var(--text-medium);
    line-height: 1.8;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.philosophy-item {
    text-align: center;
}

.philosophy-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.philosophy-icon svg {
    color: white;
}

.philosophy-item h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.philosophy-item p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 0;
}

.about-images {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-image-placeholder {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    border: 2px dashed var(--border-color);
}

.about-image-placeholder svg {
    color: var(--border-color);
    margin-bottom: 16px;
}

.about-image-placeholder p {
    color: var(--text-medium);
    font-weight: 500;
    margin-bottom: 8px;
}

.about-image-placeholder span {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ========================================
   Contact Section
   ======================================== */

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background-color: var(--bg-light);
    border-radius: 12px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    color: white;
}

.contact-details h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.contact-details p {
    color: var(--text-medium);
    margin-bottom: 8px;
}

.contact-details a {
    color: var(--text-dark);
    font-weight: 500;
}

.text-muted {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ========================================
   Contact Form
   ======================================== */

.contact-form {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.required {
    color: var(--secondary-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 77, 122, 0.1);
}

.checkbox-group,
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.checkbox-label,
.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: normal;
}

.checkbox-label input[type="checkbox"],
.radio-label input[type="radio"] {
    width: auto;
    cursor: pointer;
}

.form-status {
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    display: none;
}

.form-status.success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-status.error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background-color: var(--primary-dark);
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info h4 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.footer-slogan {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

.footer-contact p {
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.9);
}

.footer-contact a {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin: 0;
}

/* ========================================
   Scroll to Top Button
   ======================================== */

.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--secondary-color);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: var(--primary-color);
    transform: translateY(-4px);
}

.scroll-top svg {
    color: white;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    /* Navigation */
    .mobile-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 30px 30px;
        box-shadow: var(--shadow-lg);
        transition: right var(--transition-normal);
        gap: 20px;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-cta {
        display: none;
    }
    
    .nav-cta-mobile {
        display: block;
        width: 100%;
    }
    
    .nav-cta-mobile .btn {
        width: 100%;
    }
    
    /* Hero */
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
        text-align: center;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 24px;
    }
    
    /* Sections */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    .section-title { font-size: 2rem; }
    
    .services-grid,
    .workflow-steps,
    .faq-grid,
    .equipment-grid,
    .quality-grid,
    .philosophy-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .btn-lg {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .service-card,
    .workflow-step,
    .contact-form {
        padding: 24px;
    }
}