@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700;900&family=Outfit:wght@400;600;800&display=swap');

:root {
    --font-sans: 'Outfit', 'Noto Sans TC', sans-serif;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    
    --bg-main: #eff0f3;
    --bg-card: #fffffe;
    --bg-alt: #e4e5e9;
    --text-headline: #0d0d0d;
    --text-paragraph: #2a2a2a;
    --color-primary: #ff8e3c;
    --color-primary-text: #0d0d0d;
    --color-tertiary: #d9376e;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(13, 13, 13, 0.05);
    --shadow-sm: 0 4px 6px rgba(13, 13, 13, 0.05);
    --shadow-md: 0 10px 20px rgba(13, 13, 13, 0.08);
    --shadow-lg: 0 20px 40px rgba(13, 13, 13, 0.12);
}

[data-theme="dark"] {
    --bg-main: #232946;
    --bg-card: #121629;
    --bg-alt: #1a1e35;
    --text-headline: #fffffe;
    --text-paragraph: #b8c1ec;
    --color-primary: #eebbc3;
    --color-primary-text: #0d0d0d;
    --color-tertiary: #d4939d;
    --glass-bg: rgba(18, 22, 41, 0.85);
    --glass-border: rgba(255, 255, 255, 0.05);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); color: var(--text-paragraph); background-color: var(--bg-main); line-height: 1.6; transition: background-color var(--transition-smooth), color var(--transition-smooth); overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
ul { list-style: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section-padding { padding: 100px 0; }
.text-center { text-align: center; }
.highlight { color: var(--color-primary); }
.bg-alt { background-color: var(--bg-alt); }

h1, h2, h3, h4, h5 { color: var(--text-headline); line-height: 1.2; transition: color var(--transition-smooth); }
h1 { font-size: 3.5rem; font-weight: 800; margin-bottom: 24px; }
h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 20px; }
h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 12px; }
p { font-size: 1.1rem; margin-bottom: 16px; }

.btn-primary, .btn-primary-outline, .btn-secondary { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 50px; font-weight: 700; cursor: pointer; transition: all var(--transition-smooth); border: none; font-family: var(--font-sans); text-align: center; }
.btn-primary { background-color: var(--color-primary); color: var(--color-primary-text); box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15); filter: brightness(1.1); }
.btn-primary, .btn-primary-outline, .btn-secondary, .theme-toggle, .nav-menu a, .logo-light, .logo-dark { will-change: transform, opacity, background-color; }
/* Logo theme switching - fixed 160x60 bounding box for both logos */
.logo-light, .logo-dark { width: 160px; height: 60px; object-fit: contain; object-position: left center; }
.logo-light { display: block; }
.logo-dark { display: none; }
[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark { display: block; }
.btn-primary-outline { background-color: transparent; border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-primary-outline:hover { background-color: var(--color-primary); color: var(--color-primary-text); }
.btn-secondary { background-color: var(--bg-card); color: var(--text-headline); border: 1px solid var(--glass-border); }
.btn-secondary:hover { background-color: var(--bg-alt); transform: translateY(-2px); }

.navbar { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: var(--glass-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--glass-border); transition: all var(--transition-smooth); padding: 15px 0; }
.navbar.scrolled { padding: 10px 0; box-shadow: var(--shadow-sm); }
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: baseline; gap: 8px; z-index: 1001; }
.logo-text { font-size: 1.8rem; font-weight: 900; color: var(--text-headline); letter-spacing: -1px; }
.nav-menu ul { display: flex; align-items: center; gap: 30px; }
.nav-menu a { font-weight: 500; color: var(--text-paragraph); position: relative; }
.nav-menu a:not(.btn-primary)::after { content: ""; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background-color: var(--color-primary); transition: width var(--transition-smooth); }
.nav-menu a:hover:not(.btn-primary)::after { width: 100%; }
.nav-menu a:hover { color: var(--text-headline); }
.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: 100%; left: -20px; background: var(--bg-card); min-width: 200px; border-radius: 12px; box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(10px); transition: all var(--transition-smooth); padding: 10px 0; border: 1px solid var(--glass-border); display: flex; flex-direction: column; gap: 0; }
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu li { width: 100%; }
.dropdown-menu a { display: block; padding: 12px 20px; width: 100%; border-bottom: 1px solid var(--glass-border); }
.dropdown-menu a::after { display: none; }
.dropdown-menu li:last-child a { border-bottom: none; }
.dropdown-menu a:hover { background: var(--bg-alt); color: var(--color-primary); }
.theme-toggle { background: none; border: none; color: var(--text-headline); cursor: pointer; font-size: 1.2rem; padding: 8px; border-radius: 50%; transition: all var(--transition-fast); display: flex; align-items: center; justify-content: center; }
.theme-toggle:hover { background: var(--bg-alt); }
.nav-actions { display: flex; align-items: center; gap: 20px; }
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; z-index: 1001; }
.mobile-menu-btn span { width: 25px; height: 3px; background-color: var(--text-headline); border-radius: 3px; transition: 0.3s; }

.hero { position: relative; padding: 180px 0 100px; min-height: 100vh; display: flex; align-items: center; overflow: hidden; }
.hero-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; overflow: hidden; }
.hero-gradient { width: 100%; height: 100%; background-image: linear-gradient(to top, #a8edea 0%, #fed6e3 100%); opacity: 0.55; transition: opacity var(--transition-smooth); }
[data-theme="dark"] .hero-gradient { background-image: linear-gradient(to top, #88d3ce 0%, #6e45e2 100%); opacity: 0.35; }
.gradient-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: radial-gradient(circle at 70% 30%, rgba(255, 142, 60, 0.15) 0%, transparent 60%); }
[data-theme="dark"] .gradient-overlay { background: radial-gradient(circle at 70% 30%, rgba(238, 187, 195, 0.15) 0%, transparent 60%); }
.hero-content { display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.hero-text { flex: 1.2; }
.badge { display: inline-block; padding: 6px 16px; background-color: var(--bg-card); color: var(--color-primary); border: 1px solid var(--color-primary); border-radius: 20px; font-size: 0.9rem; font-weight: 700; margin-bottom: 24px; letter-spacing: 1px; }
.hero-actions { margin-top: 40px; display: flex; gap: 16px; }
.hero-visual { flex: 1; position: relative; }
.glass-card { background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border: 1px solid var(--glass-border); border-radius: 24px; padding: 30px; box-shadow: var(--shadow-lg); transition: transform var(--transition-smooth), background-color var(--transition-smooth); }
.glass-card:hover { transform: translateY(-5px); }
.data-row { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; border-bottom: 1px solid var(--glass-border); }
.data-row:last-child { border-bottom: none; }
.data-row .label { font-weight: 500; color: var(--text-paragraph); }
.data-row .value { font-size: 1.5rem; font-weight: 800; color: var(--text-headline); font-family: monospace; }
.data-row .value.highlight { color: var(--color-primary); }

.section-header { max-width: 700px; margin: 0 auto 60px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-card { background: var(--bg-card); padding: 40px 30px; border-radius: 20px; box-shadow: var(--shadow-sm); transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth); border: 1px solid var(--glass-border); position: relative; overflow: hidden; }
.feature-card::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: var(--color-primary); transform: scaleX(0); transform-origin: left; transition: transform var(--transition-smooth); }
.feature-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { transform: scaleX(1); }
.icon-wrapper { width: 64px; height: 64px; border-radius: 16px; background: var(--bg-alt); color: var(--text-headline); display: flex; align-items: center; justify-content: center; margin-bottom: 24px; transition: background-color var(--transition-smooth), color var(--transition-smooth); }
.feature-card:hover .icon-wrapper { background: var(--color-primary); color: var(--color-primary-text); }
.icon-wrapper svg { width: 32px; height: 32px; }

.scenario-item { display: flex; align-items: center; gap: 60px; margin-bottom: 100px; }
.scenario-item.reverse { flex-direction: row-reverse; }
.scenario-item:last-child { margin-bottom: 0; }
.scenario-content { flex: 1; }
.check-list { margin-top: 24px; }
.check-list li { position: relative; padding-left: 36px; margin-bottom: 16px; font-weight: 500; color: var(--text-headline); }
.check-list li::before { content: '✓'; position: absolute; left: 0; top: 2px; color: var(--color-primary-text); font-weight: bold; background: var(--color-primary); width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.9rem; }
.scenario-image { flex: 1.2; width: 100%; border-radius: 24px; overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }

/* Carousel Styles */
.carousel { position: relative; width: 100%; aspect-ratio: 16/9; display: flex; overflow: hidden; border-radius: 24px; background: var(--bg-alt); }
.carousel-inner { display: flex; width: 100%; height: 100%; transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1); transform: translateZ(0); backface-visibility: hidden; will-change: transform; }
.carousel-item { flex: 0 0 100%; min-width: 100%; width: 100%; height: 100%; position: relative; transform: translateZ(0); backface-visibility: hidden; }
.carousel-item img { width: 100%; height: 100%; object-fit: contain; display: block; background-color: var(--bg-alt); }
.carousel-caption { position: absolute; bottom: 0; left: 0; width: 100%; background: rgba(0,0,0,0.6); color: white; padding: 15px; text-align: center; font-weight: 600; }
.carousel-control { position: absolute; top: 50%; transform: translateY(-50%); background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-headline); width: 40px; height: 40px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; transition: background-color 0.3s, color 0.3s, transform 0.3s; z-index: 2; }
.carousel-control:hover { background: var(--color-primary); color: var(--color-primary-text); transform: translateY(-50%) scale(1.1); }
.carousel-control.prev { left: 10px; }
.carousel-control.next { right: 10px; }
.carousel-indicators { position: absolute; bottom: 50px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 2; }
.indicator { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.5); cursor: pointer; transition: 0.3s; }
.indicator.active { background: var(--color-primary); transform: scale(1.2); }

.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(350px, 1fr)); gap: 30px; }
.gallery-card { background: var(--bg-card); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-sm); transition: transform var(--transition-smooth), box-shadow var(--transition-smooth); border: 1px solid var(--glass-border); }
.gallery-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); }
.gallery-img { aspect-ratio: 16/9; height: auto; width: 100%; object-fit: contain; background-color: var(--bg-alt); border-bottom: 1px solid var(--glass-border); display: block; }
.gallery-content { padding: 20px; }

.patents-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; align-items: center; justify-content: center; margin-top: 30px; }
.patents-grid img { width: 100%; height: auto; border-radius: 12px; box-shadow: var(--shadow-sm); border: 1px solid var(--glass-border); transition: transform 0.3s; background: var(--bg-card); }
.patents-grid a:hover img { transform: translateY(-5px); box-shadow: var(--shadow-md); }

.contact-grid { display: flex; gap: 60px; }
.contact-info { flex: 1; }
.info-item { display: flex; gap: 20px; margin-bottom: 30px; }
.info-item .icon { font-size: 1.8rem; color: var(--color-primary); }
.contact-form { flex: 1; }
.form-group { margin-bottom: 24px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--text-headline); }
.form-group input, .form-group select { width: 100%; padding: 15px 20px; border-radius: 12px; border: 1px solid var(--glass-border); background: var(--bg-main); color: var(--text-headline); font-family: inherit; font-size: 1rem; transition: all var(--transition-fast); }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 4px rgba(255, 142, 60, 0.1); }

/* Vista Flip 3D Styles */
.vista-container { position: relative; width: 100%; height: 500px; perspective: 1200px; display: flex; justify-content: center; align-items: center; margin: 40px 0; overflow: visible; }
.vista-item { position: absolute; width: 320px; height: 450px; transition: all 0.6s cubic-bezier(0.2, 0.8, 0.2, 1); cursor: pointer; border-radius: 16px; box-shadow: -15px 25px 50px rgba(0,0,0,0.5); opacity: 0; pointer-events: none; transform-style: preserve-3d; background: var(--bg-card); border: 2px solid var(--glass-border); overflow: hidden; }
.vista-item img { width: 100%; height: 100%; object-fit: contain; background: var(--bg-alt); }
.vista-item.active { opacity: 1; pointer-events: auto; transform: translateX(-200px) translateZ(150px) rotateY(10deg); z-index: 100; }
.vista-item.active:hover { transform: translateX(-200px) translateZ(170px) rotateY(0deg); box-shadow: -20px 30px 60px rgba(0,0,0,0.6); }
.vista-item.stack-1 { opacity: 0.9; pointer-events: auto; transform: translateX(-80px) translateZ(0px) rotateY(20deg); z-index: 90; }
.vista-item.stack-1:hover { transform: translateX(-80px) translateZ(20px) rotateY(15deg); }
.vista-item.stack-2 { opacity: 0.7; pointer-events: auto; transform: translateX(40px) translateZ(-150px) rotateY(30deg); z-index: 80; }
.vista-item.stack-3 { opacity: 0.5; pointer-events: auto; transform: translateX(160px) translateZ(-300px) rotateY(40deg); z-index: 70; }
.vista-item.stack-4 { opacity: 0.3; pointer-events: auto; transform: translateX(280px) translateZ(-450px) rotateY(45deg); z-index: 60; }
.vista-item.stack-5 { opacity: 0.1; pointer-events: auto; transform: translateX(400px) translateZ(-600px) rotateY(50deg); z-index: 50; }
.vista-item.stack-6 { opacity: 0; pointer-events: none; transform: translateX(500px) translateZ(-750px) rotateY(55deg); z-index: 40; }
.vista-item.passed { opacity: 0; transform: translateX(-500px) translateZ(500px) rotateY(0deg); z-index: 110; }

/* Vista Nav Buttons (Prev/Next + Counter) */
.vista-nav { display: flex; align-items: center; justify-content: center; gap: 20px; margin-top: 16px; }
.vista-btn { background: var(--bg-card); border: 2px solid var(--glass-border); color: var(--text-headline); width: 44px; height: 44px; border-radius: 50%; font-size: 1.3rem; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast); font-family: inherit; }
.vista-btn:hover { background: var(--color-primary); color: var(--color-primary-text); transform: scale(1.1); }
.vista-counter { font-size: 0.9rem; font-weight: 600; color: var(--text-paragraph); min-width: 40px; text-align: center; }

/* Vista Modal Styles */
.vista-modal { display: none; position: fixed; z-index: 2000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.85); backdrop-filter: blur(12px); overflow: auto; padding-top: 50px; }
.vista-modal.show { display: flex; justify-content: center; align-items: center; animation: fadeIn 0.3s ease; }
.vista-modal-content { margin: auto; display: block; max-width: 90%; max-height: 85vh; border-radius: 12px; box-shadow: 0 20px 60px rgba(0,0,0,0.5); animation: zoomIn 0.3s cubic-bezier(0.2, 0.8, 0.2, 1); }
@keyframes fadeIn { from {opacity: 0;} to {opacity: 1;} }
@keyframes zoomIn { from {transform: scale(0.8); opacity: 0;} to {transform: scale(1); opacity: 1;} }
.vista-close { position: absolute; top: 30px; right: 50px; color: #fff; font-size: 50px; font-weight: bold; cursor: pointer; transition: 0.3s; z-index: 2001; }
.vista-close:hover { color: var(--color-primary); transform: scale(1.1); }

footer { background-color: var(--bg-card); border-top: 1px solid var(--glass-border); padding: 80px 0 30px; margin-top: 50px; }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 50px; margin-bottom: 60px; }
.footer-brand p { margin-top: 20px; }
.footer-links { display: flex; gap: 80px; flex-wrap: wrap; }
.link-group h4 { margin-bottom: 24px; }
.link-group ul li { margin-bottom: 12px; }
.link-group a:hover { color: var(--color-primary); }
.footer-partners h4 { margin-bottom: 20px; }
.partner-logos { display: flex; flex-direction: column; gap: 15px; }
.partner-logos a { font-weight: 600; display: flex; align-items: center; gap: 10px; }
.partner-logos a::before { content: "•"; color: var(--color-primary); }
.footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid var(--glass-border); font-size: 0.9rem; }

.reveal { opacity: 0; transform: translateY(40px); transition: opacity var(--transition-slow), transform var(--transition-slow); }
.reveal.active { opacity: 1; transform: translateY(0); }

@media (max-width: 992px) {
    h1 { font-size: 2.8rem; }
    .hero-content { flex-direction: column; text-align: center; }
    .hero-actions { justify-content: center; }
    .scenario-item, .scenario-item.reverse { flex-direction: column; gap: 40px; }
    .contact-grid { flex-direction: column; }
    .footer-links { gap: 40px; }
}

@media (max-width: 768px) {
    .nav-actions { display: none; }
    .nav-actions.active { display: flex; flex-direction: column; width: 100%; margin-top: 20px; }
    .nav-menu { position: absolute; top: 100%; left: 0; width: 100%; background: var(--bg-card); padding: 20px; box-shadow: var(--shadow-lg); display: none; flex-direction: column; border-bottom: 1px solid var(--glass-border); }
    .nav-menu.active { display: flex; }
    .nav-menu ul { flex-direction: column; gap: 0; width: 100%; }
    .nav-menu li { width: 100%; }
    .nav-menu a { display: block; padding: 15px 0; border-bottom: 1px solid var(--glass-border); }
    .dropdown-menu { position: static; box-shadow: none; border: none; background: var(--bg-alt); display: none; opacity: 1; visibility: visible; transform: none;}
    .dropdown.active .dropdown-menu { display: block; }
    .mobile-menu-btn { display: flex; }
    h1 { font-size: 2.2rem; }

    /* Vista Gallery — mobile: horizontal scroll-snap */
    .vista-container {
        height: auto;
        perspective: none;
        display: flex;
        flex-direction: row;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 16px;
        padding: 16px 20px;
        margin: 20px 0;
        align-items: stretch;
        justify-content: flex-start;
        /* hide scrollbar but keep functionality */
        scrollbar-width: none;
    }
    .vista-container::-webkit-scrollbar { display: none; }

    .vista-item {
        position: relative;
        flex: 0 0 80vw;
        max-width: 300px;
        height: 400px;
        width: 80vw;
        transform: none !important;
        opacity: 1 !important;
        pointer-events: auto !important;
        scroll-snap-align: center;
        box-shadow: var(--shadow-md);
        border: 2px solid var(--glass-border);
        transition: transform 0.3s, box-shadow 0.3s;
    }
    .vista-item.mobile-active {
        border-color: var(--color-primary);
        box-shadow: 0 8px 32px rgba(0,0,0,0.25);
        transform: scale(1.03) !important;
    }

    /* Vista modal — tighter on small screens */
    .vista-close { top: 16px; right: 20px; font-size: 36px; }
    .vista-modal-content { max-width: 95%; max-height: 80vh; }
}

@media (max-width: 480px) {
    .vista-item { flex: 0 0 90vw; max-width: 90vw; height: 360px; }
}