/* ============================================
   企業官網樣式表
   技術規範：BEM命名規範、Flexbox/Grid布局
   色彩方案：主色 #2563EB、輔色 #7C3AED
   響應式斷點：桌面≥1024px、平板768-1023px、手機<768px
   ============================================ */

/* ========== CSS Variables ========== */
:root {
    /* Colors */
    --color-primary: #2563EB;
    --color-secondary: #7C3AED;
    --color-background-start: #F8FAFC;
    --color-background-end: #EFF6FF;
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-white: #FFFFFF;
    --color-success: #10B981;
    --color-error: #EF4444;
    
    /* Typography */
    --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-h1: 3rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 2rem;
    --font-size-h4: 1.5rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --box-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    line-height: 1.6;
    background: linear-gradient(135deg, var(--color-background-start) 0%, var(--color-background-end) 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ========== Container ========== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ========== Header & Navigation ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--box-shadow);
    transition: all var(--transition-base);
}

.nav__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.nav__logo i {
    font-size: 1.5rem;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav__link {
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    position: relative;
}

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

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--color-primary);
    transition: transform var(--transition-fast);
}

.nav__link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.nav__lang-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.nav__lang-btn:hover {
    background: var(--color-background-start);
    color: var(--color-primary);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-xs);
}

.nav__toggle-line {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }
    
    .nav__menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--box-shadow-lg);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        gap: var(--spacing-sm);
    }
    
    .nav__menu.active {
        transform: translateX(0);
    }
    
    .nav__toggle.active .nav__toggle-line:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav__toggle.active .nav__toggle-line:nth-child(2) {
        opacity: 0;
    }
    
    .nav__toggle.active .nav__toggle-line:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

/* ========== Hero Section ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: 70px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    overflow: hidden;
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    animation: fadeInUp 1s ease;
}

.hero__title {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.hero__title-main {
    display: block;
    font-size: var(--font-size-h1);
    font-weight: 300;
    margin-bottom: var(--spacing-xs);
}

.hero__title-accent {
    display: block;
    font-size: var(--font-size-h1);
    font-weight: 700;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

.hero__cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero__scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-white);
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@media (max-width: 768px) {
    .hero__title-main,
    .hero__title-accent {
        font-size: 2rem;
    }
    
    .hero__subtitle {
        font-size: 1rem;
    }
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

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

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

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

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

.btn--full {
    width: 100%;
    justify-content: center;
}

.btn__icon {
    transition: transform var(--transition-fast);
}

.btn:hover .btn__icon {
    transform: translateX(4px);
}

/* ========== Section Header ========== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header__title {
    font-size: var(--font-size-h2);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-header__title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

.section-header__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-md);
}

/* ========== Services Section ========== */
.services {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
    transition: all var(--transition-base);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

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

.service-card__icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
    font-size: 2rem;
}

.service-card__title {
    font-size: var(--font-size-h4);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.service-card__description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.service-card__mockup {
    margin: var(--spacing-md) 0;
    text-align: center;
}

.service-card__mockup-img {
    max-width: 200px;
    width: 100%;
    height: auto;
    margin: 0 auto;
    display: block;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.service-card__features {
    margin-top: var(--spacing-md);
}

.service-card__feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.service-card__feature i {
    color: var(--color-success);
    font-size: 1.125rem;
}

/* ========== Technology Stack Section ========== */
.tech {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-background-start) 0%, var(--color-background-end) 100%);
}

.tech__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.tech__item {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: all var(--transition-base);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.tech__item:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-lg);
    border-color: var(--color-primary);
}

.tech__icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.tech__name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.tech__description {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ========== Contact Section ========== */
.contact {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact__item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact__icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact__details {
    flex: 1;
}

.contact__label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact__value {
    font-size: 1.125rem;
    color: var(--color-text);
    font-weight: 500;
}

.contact__email {
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.contact__email:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

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

.contact__social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.contact__social-link {
    width: 40px;
    height: 40px;
    background: var(--color-background-start);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.contact__social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* ========== Contact Form ========== */
.contact__form {
    background: var(--color-background-start);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

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

.form__label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text);
}

.form__required {
    color: var(--color-error);
}

.form__input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--color-white);
}

.form__input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form__input--textarea {
    resize: vertical;
    min-height: 120px;
}

.form__input.error {
    border-color: var(--color-error);
}

.form__error {
    display: block;
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    min-height: 20px;
}

.form__message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 500;
    display: none;
}

.form__message.success {
    display: block;
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.form__message.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

@media (max-width: 1023px) {
    .contact__grid {
        grid-template-columns: 1fr;
    }
}

/* ========== Footer ========== */
.footer {
    background: var(--color-text);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer__content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer__brand {
    max-width: 300px;
}

.footer__logo {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.footer__tagline {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer__title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.footer__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer__link {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-white);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-md);
    text-align: center;
}

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

@media (max-width: 768px) {
    .footer__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* ========== Back to Top Button ========== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--box-shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-secondary);
    transform: translateY(-4px);
}

/* ========== Accessibility ========== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========== Print Styles ========== */
@media print {
    .header,
    .hero__scroll-indicator,
    .back-to-top {
        display: none;
    }
    
    body {
        background: white;
    }
}