:root {
    --primary-color: #0d2a4c;
    --secondary-color: #a48654;
    --accent-color: #c9a66b;
    --text-color: #333333;
    --light-gray-bg: #f8f9fa;
    --shadow-soft: 0 10px 30px rgba(13, 42, 76, 0.12);
    --transition-base: 0.35s ease;
    --mobile-breakpoint: 768px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Helvetica Neue', '微軟正黑體', 'Microsoft JhengHei', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #ffffff;
}

a:not(.skip-link) {
    color: inherit;
    text-decoration: none;
}

a {
    outline: none;
}

a:focus-visible {
    outline: 3px solid var(--secondary-color);
    outline-offset: 4px;
}

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

.skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    padding: 10px 18px;
    background: var(--primary-color);
    color: #ffffff;
    border-radius: 999px;
    font-weight: 600;
    transition: top 0.2s ease;
    z-index: 1200;
}

.skip-link:focus {
    top: 16px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

h1,
 h2,
 h3 {
    color: var(--primary-color);
    margin-top: 0;
}

h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    margin: 12px auto 0;
    border-radius: 12px;
}

section {
    padding: 80px 0;
    position: relative;
    background-color: #ffffff;
}

.section-divider {
    height: 80px;
    background: linear-gradient(90deg, rgba(13, 42, 76, 0.05), rgba(164, 134, 84, 0.3), rgba(13, 42, 76, 0.05));
}

.decorated-section {
    position: relative;
}

.decorated-section::before,
.decorated-section::after {
    content: '';
    position: absolute;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle at center, rgba(164, 134, 84, 0.18), transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.decorated-section::before {
    top: -110px;
    left: 6%;
}

.decorated-section::after {
    bottom: -110px;
    right: 10%;
}

.decorated-section .container {
    position: relative;
    z-index: 1;
}

.navbar {
    background: rgba(255, 255, 255, 0.98);
    color: var(--primary-color);
    padding: 1.1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    transition: padding var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
    backdrop-filter: blur(6px);
}

.navbar.scrolled {
    padding: 0.7rem 0;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 8px 22px rgba(13, 42, 76, 0.08);
}


.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: transform var(--transition-base);
    letter-spacing: 0.08em;
}

.navbar.scrolled .logo {
    transform: translateY(-2px);
    font-size: 1.4rem;
}

.nav-main {
    display: flex;
    align-items: center;
    gap: 28px;
}

.navbar ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
    gap: 24px;
}

.navbar ul li a {
    color: var(--primary-color);
    font-weight: 500;
    position: relative;
    padding-bottom: 4px;
    transition: color var(--transition-base);
}

.navbar ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--secondary-color);
    transition: width var(--transition-base);
    border-radius: 2px;
}

.navbar ul li a:hover,
.navbar ul li a:focus-visible {
    color: var(--secondary-color);
}

.navbar ul li a:hover::after,
.navbar ul li a:focus-visible::after {
    width: 100%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 18px;
}

.language-switcher select {
    background: rgba(13, 42, 76, 0.06);
    border: 1px solid rgba(13, 42, 76, 0.14);
    border-radius: 999px;
    padding: 6px 40px 6px 16px;
    font-weight: 500;
    color: var(--primary-color);
    appearance: none;
    position: relative;
    font-size: 0.95rem;
}

.language-switcher {
    position: relative;
}

.language-switcher::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--primary-color);
    font-size: 0.85rem;
}

.language-switcher select:focus-visible {
    outline: 3px solid rgba(164, 134, 84, 0.4);
    outline-offset: 2px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.menu-toggle:focus-visible {
    outline: 3px solid var(--secondary-color);
    outline-offset: 5px;
    border-radius: 6px;
}

.menu-toggle span:not(.visually-hidden) {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 140px 20px 100px;
    color: #ffffff;
    overflow: hidden;
    background: radial-gradient(circle at 20% 20%, rgba(164, 134, 84, 0.28), transparent 55%),
        radial-gradient(circle at 80% 0%, rgba(255, 255, 255, 0.1), transparent 60%),
        linear-gradient(135deg, rgba(13, 42, 76, 0.95), rgba(3, 64, 184, 0.85));
}

.hero::before,
.hero::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    z-index: 0;
    animation: float 12s ease-in-out infinite;
}

.hero::before {
    width: 320px;
    height: 320px;
    top: -160px;
    left: -80px;
    animation-delay: 0.3s;
}

.hero::after {
    width: 280px;
    height: 280px;
    bottom: -120px;
    right: -100px;
    animation-delay: 1.4s;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 760px;
}

.hero h1 {
    font-size: 3.4rem;
    margin-bottom: 16px;
    color: #fff;
    letter-spacing: 0.02em;
}

.hero p {
    font-size: 1.18rem;
    margin-bottom: 32px;
    line-height: 1.75;
    color: rgba(255, 255, 255, 0.9);
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: #fff;
    padding: 14px 34px;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 600;
    box-shadow: 0 15px 30px rgba(164, 134, 84, 0.3);
    transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-4px);
    box-shadow: 0 20px 38px rgba(164, 134, 84, 0.34);
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
}

#experience {
    background: var(--light-gray-bg);
}

.contact-flex {
    display: flex;
    justify-content: center;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image::after {
    content: '';
    position: absolute;
    top: -18px;
    left: -18px;
    width: 100%;
    height: 100%;
    border: 3px solid rgba(164, 134, 84, 0.6);
    border-radius: 14px;
    z-index: 0;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 14px;
    box-shadow: var(--shadow-soft);
    position: relative;
    z-index: 1;
}

.stats-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 24px;
    margin-top: 40px;
}

.stat-item {
    flex: 1 1 30%;
    text-align: center;
    background-color: #ffffff;
    padding: 24px;
    border-radius: 14px;
    box-shadow: var(--shadow-soft);
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(164, 134, 84, 0.08), rgba(13, 42, 76, 0.05));
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.stat-item:hover,
.stat-item:focus-within {
    transform: translateY(-6px);
    box-shadow: 0 20px 35px rgba(13, 42, 76, 0.12);
}

.stat-item:hover::before,
.stat-item:focus-within::before {
    opacity: 1;
}

.stat-item h3 {
    margin: 0;
    color: var(--secondary-color);
    font-weight: 700;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.stat-number {
    display: block;
    min-width: 3ch;
    font-size: 2.8rem;
    line-height: 1;
}

.stat-suffix {
    font-size: 1.15rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.stat-item p {
    margin: 10px 0 0;
    color: #555;
    font-size: 1rem;
    position: relative;
    z-index: 1;
}

.experience-container {
    max-width: 900px;
    margin: 0 auto;
}

.icon-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.icon-item {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    background: #fff;
    padding: 26px 28px;
    border-radius: 14px;
    box-shadow: var(--shadow-soft);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}

.icon-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(13, 42, 76, 0.05), rgba(164, 134, 84, 0.05));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.icon-item:hover::before,
.icon-item:focus-within::before {
    opacity: 1;
}

.icon-item:hover,
.icon-item:focus-within {
    transform: translateY(-6px);
    box-shadow: 0 18px 32px rgba(13, 42, 76, 0.12);
}

.icon-item i {
    font-size: 2.4rem;
    color: var(--secondary-color);
    margin-top: 4px;
    position: relative;
    z-index: 1;
}

.icon-item h4 {
    margin: 0 0 6px 0;
    color: var(--primary-color);
    position: relative;
    z-index: 1;
}

.icon-item p {
    margin: 0;
    font-size: 1rem;
    color: #555;
    position: relative;
    z-index: 1;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    text-align: center;
}

.service-card {
    background: #fff;
    padding: 36px 28px;
    border-radius: 16px;
    box-shadow: var(--shadow-soft);
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top, rgba(164, 134, 84, 0.12), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.service-card:hover::before,
.service-card:focus-within::before {
    opacity: 1;
}

.service-card:hover,
.service-card:focus-within {
    transform: translateY(-10px);
    box-shadow: 0 22px 38px rgba(13, 42, 76, 0.18);
}

.service-card i {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
}

.service-card h3 {
    margin-bottom: 16px;
    font-size: 1.35rem;
    position: relative;
    z-index: 1;
}

.service-card p {
    position: relative;
    z-index: 1;
    color: #555;
    line-height: 1.7;
}

.contact-info {
    max-width: 720px;
    width: 100%;
    text-align: center;
    background: linear-gradient(135deg, rgba(13, 42, 76, 0.05), rgba(164, 134, 84, 0.08));
    padding: 40px;
    border-radius: 18px;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.contact-info::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(164, 134, 84, 0.16), transparent 55%);
    opacity: 0.9;
    pointer-events: none;
}

.contact-info > * {
    position: relative;
    z-index: 1;
}

.contact-info p {
    color: #444;
}

.contact-info-list {
    display: inline-block;
    text-align: left;
    margin-top: 24px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 22px;
}

.contact-info-item i {
    font-size: 1.4rem;
    color: var(--secondary-color);
    margin-top: 4px;
    line-height: 1;
}

.contact-info-item p {
    margin: 0;
    line-height: 1.6;
}

.contact-info-item p strong {
    display: block;
    margin-bottom: 4px;
    color: var(--primary-color);
}

.footer {
    background: var(--primary-color);
    color: #fff;
    text-align: center;
    padding: 24px 0;
    font-size: 0.95rem;
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 74px;
    left: 0;
    width: 100%;
    background: #ffffff;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
    z-index: 999;
    border-radius: 0 0 18px 18px;
    transform-origin: top;
    transform: translateY(-8px);
    opacity: 0;
    transition: opacity 0.28s ease, transform 0.28s ease;
}

.mobile-nav.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.mobile-lang {
    padding: 18px 24px 10px;
    border-bottom: 1px solid rgba(13, 42, 76, 0.08);
}

.mobile-nav ul {
    list-style: none;
    padding: 12px 0;
    margin: 0;
}

.mobile-nav ul li {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(13, 42, 76, 0.08);
}

.mobile-nav ul li:last-child {
    border-bottom: none;
}

.mobile-nav ul li a {
    color: var(--primary-color);
    font-weight: 500;
    display: block;
}

.mobile-nav ul li a:focus-visible {
    background: rgba(13, 42, 76, 0.08);
    outline: none;
    border-radius: 8px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 12px 25px rgba(164, 134, 84, 0.32);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
    z-index: 900;
}

.back-to-top i {
    font-size: 1.2rem;
}

.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(-4px);
}

.back-to-top:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.8);
    outline-offset: 4px;
}

.back-to-top:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 30px rgba(164, 134, 84, 0.38);
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal[data-delay="100"] {
    transition-delay: 0.1s;
}

.reveal[data-delay="200"] {
    transition-delay: 0.18s;
}

.reveal[data-delay="300"] {
    transition-delay: 0.25s;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes float {
    0%,
     100% {
        transform: translateY(0) scale(1);
    }

    50% {
        transform: translateY(16px) scale(1.03);
    }
}

@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-image {
        max-width: 520px;
        margin: 0 auto;
    }

    .decorated-section::before {
        left: -40px;
    }

    .decorated-section::after {
        right: -30px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    h2 {
        font-size: 1.8rem;
        margin-bottom: 32px;
    }

    .navbar ul {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 20px 80px;
        min-height: 90vh;
    }

    .hero h1 {
        font-size: 2.4rem;
    }

    .hero p {
        font-size: 1.05rem;
    }

    .stats-grid {
        flex-direction: column;
    }

    .stat-item {
        flex: 1 1 100%;
    }

    .icon-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }

    .contact-info {
        padding: 32px 24px;
    }

    .mobile-nav {
        top: 68px;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        padding: 16px 24px;
    }

    .hero h1 {
        font-size: 2.1rem;
    }

    .hero p {
        font-size: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
     *::before,
     *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1 !important;
        transform: none !important;
    }
}