:root {
    --primary: #0EA5A4;
    --primary-dark: #0D9488;
    --secondary: #38BDF8;
    --dark: #07111F;
    --background: #F8FAFC;
    --white: #FFFFFF;
    --gray-400: #94A3B8;
    --gray-600: #475569;
    --success: #22C55E;
    --danger: #EF4444;
    --sdgs-3: #4C9F38;
    --sdgs-4: #C7212F;
    --sdgs-10: #DD1367;
    --font-family: 'Inter', 'Noto Sans TC', 'Segoe UI', -apple-system, sans-serif;
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: 96px;
}

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--dark);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    line-height: 1.7;
}

body.is-loading {
    overflow: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.hero-container {
    width: 100%;
    max-width: 1536px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 90px 0;
    scroll-margin-top: 96px;
}

:focus-visible {
    outline: 3px solid rgba(13, 148, 136, 0.35);
    outline-offset: 3px;
}

.nav-link:focus-visible,
.ed-btn:focus-visible,
.lang-select:focus-visible,
.faq-q:focus-visible,
.game-btn:focus-visible,
.submit-btn:focus-visible,
.download-spec-btn:focus-visible {
    outline: 3px solid rgba(13, 148, 136, 0.35);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.section-title {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    color: var(--gray-600);
    font-size: 1.1rem;
    margin-bottom: 50px;
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
}

.glass-panel {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 20px 50px rgba(7, 17, 31, 0.03);
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 76px;
    z-index: 1000;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(7, 17, 31, 0.05);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.01);
}

.navbar-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.logo span {
    color: var(--primary-dark);
}

.nav-menu {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-link {
    color: var(--gray-600);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 8px;
    outline: none;
}

.hamburger-bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--dark);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.lang-selector-box {
    position: relative;
    display: inline-block;
    margin-right: 14px;
}

.lang-select {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid rgba(7, 17, 31, 0.15);
    background: var(--white);
    color: var(--gray-600);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: var(--transition-smooth);
}

.lang-select:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
}

.ed-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 26px;
    border-radius: 980px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: 1px solid transparent;
}

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

.ed-btn--primary:hover {
    background-color: #0b7a70;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(13, 148, 136, 0.15);
}

.ed-btn--secondary {
    background-color: var(--white);
    color: var(--dark);
    border: 1px solid rgba(7, 17, 31, 0.2);
}

.ed-btn--secondary:hover {
    background-color: var(--background);
    transform: translateY(-2px);
    color: var(--primary-dark);
}

footer {
    background: #F1F5F9;
    color: var(--gray-600);
    padding: 50px 24px;
    text-align: center;
    font-size: 0.9rem;
    border-top: 1px solid rgba(7, 17, 31, 0.05);
}