/* ============================================
   鏁版櫤娲炲療 (ShuZhi Insight) - Landing Page Styles
   Primary Blue Theme | 2024
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-darker: #1e40af;
    --primary-light: #3b82f6;
    --primary-lighter: #60a5fa;
    --primary-bg: #eff6ff;
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
                 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; padding: 0; }
button { cursor: pointer; border: none; background: none; font-family: inherit; font-size: inherit; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }

/* --- Utility: Section Header --- */
.section-title {
    font-size: 2.125rem;
    font-weight: 800;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 0.75rem;
    line-height: 1.25;
    letter-spacing: -0.02em;
}
.section-subtitle {
    font-size: 1.0625rem;
    color: var(--gray-500);
    text-align: center;
    max-width: 640px;
    margin: 0 auto 3.5rem;
    line-height: 1.7;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--primary-300); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-400); }
::selection { background: var(--primary-600); color: var(--white); }

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}
.navbar.scrolled {
    background: rgba(255,255,255,0.96);
    border-bottom-color: var(--gray-100);
    box-shadow: var(--shadow-md);
}
.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.25rem;
}
.nav-brand { display: flex; align-items: center; gap: 0.625rem; }
.nav-logo {
    width: 2.5rem; height: 2.5rem;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    border-radius: 0.75rem;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}
.nav-logo svg { width: 1.25rem; height: 1.25rem; fill: var(--white); }
.nav-brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition-fast);
    position: relative;
}
.nav-links a:hover { color: var(--primary-600); }
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 0;
    width: 0; height: 2px;
    background: var(--primary-600);
    border-radius: 2px;
    transition: width var(--transition-fast);
}
.nav-links a:hover::after { width: 100%; }
.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.625rem 1.5rem;
    background: var(--primary-600);
    color: var(--white);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 9999px;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}
.nav-cta:hover {
    background: var(--primary-700);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}
.nav-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--gray-600);
    padding: 0.5rem;
    cursor: pointer;
}
.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 0.625rem;
    padding-bottom: 1.25rem;
}
.mobile-menu a {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}
.mobile-menu a:hover { color: var(--primary-600); }
.mobile-menu .nav-cta {
    display: inline-block;
    text-align: center;
    color: var(--white);
    margin-top: 0.25rem;
    width: fit-content;
}
.mobile-menu.open { display: flex; }

/* ============================================
   HERO
   ============================================ */
.hero {
    position: relative;
    padding: 7.5rem 0 4.5rem;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, var(--primary-bg) 0%, #f0f4ff 30%, var(--white) 70%, #eef2ff 100%);
    z-index: -2;
}
.hero-blob-1 {
    position: absolute;
    top: 4rem; right: -4rem;
    width: 26rem; height: 26rem;
    background: rgba(37,99,235,0.06);
    border-radius: 50%;
    filter: blur(90px);
    z-index: -1;
}
.hero-blob-2 {
    position: absolute;
    bottom: 1rem; left: -2rem;
    width: 20rem; height: 20rem;
    background: rgba(96,165,250,0.08);
    border-radius: 50%;
    filter: blur(90px);
    z-index: -1;
}
.hero-content { text-align: center; max-width: 48rem; margin: 0 auto; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 1.125rem;
    background: var(--primary-100);
    color: var(--primary-700);
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: 9999px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--primary-200);
}
.hero-badge-dot {
    width: 0.5rem; height: 0.5rem;
    background: var(--primary-500);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(1.6); }
}
.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.15;
    letter-spacing: -0.03em;
}
.hero-title span {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-400) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    margin-top: 1.5rem;
    font-size: 1.125rem;
    color: var(--gray-500);
    max-width: 40rem;
    margin-left: auto; margin-right: auto;
    line-height: 1.8;
}
.hero-actions {
    margin-top: 2.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    border-radius: 0.75rem;
    padding: 0.875rem 2rem;
    font-size: 0.9375rem;
    transition: all var(--transition);
    cursor: pointer;
}
.btn-primary {
    background: var(--primary-600);
    color: var(--white);
    box-shadow: var(--shadow-lg), 0 0 0 0 rgba(37,99,235,0.4);
    animation: btn-glow 2s ease-in-out infinite;
}
@keyframes btn-glow {
    0%, 100% { box-shadow: var(--shadow-lg), 0 0 0 0 rgba(37,99,235,0.4); }
    50% { box-shadow: var(--shadow-lg), 0 0 0 12px rgba(37,99,235,0); }
}
.btn-primary:hover {
    background: var(--primary-700);
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}
.btn-outline {
    background: var(--white);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}
.btn-outline:hover {
    border-color: var(--primary-300);
    color: var(--primary-600);
}
.hero-img-wrap {
    margin-top: 4rem;
    max-width: 56rem;
    margin-left: auto; margin-right: auto;
}
.hero-img-wrap img {
    width: 100%;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--gray-200);
}

/* ============================================
   FEATURES (3-Column)
   ============================================ */
.features { padding: 5rem 0; background: var(--white); }
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.feature-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: 2.75rem 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
    transition: all var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-400), var(--primary-600));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
    border-color: var(--primary-100);
}
.feature-icon-wrap {
    width: 4rem; height: 4rem;
    border-radius: var(--radius-xl);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
    transition: all var(--transition);
}
.feature-icon-wrap.blue { background: var(--primary-100); color: var(--primary-600); }
.feature-icon-wrap.indigo { background: #e0e7ff; color: #4f46e5; }
.feature-icon-wrap.cyan { background: #cffafe; color: #0891b2; }
.feature-card:hover .feature-icon-wrap.blue { background: var(--primary-600); color: var(--white); }
.feature-card:hover .feature-icon-wrap.indigo { background: #4f46e5; color: var(--white); }
.feature-card:hover .feature-icon-wrap.cyan { background: #0891b2; color: var(--white); }
.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
}
.feature-card p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.75;
}

/* ============================================
   STATS
   ============================================ */
.stats-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    color: var(--white);
    position: relative;
    overflow: hidden;
}
.stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,0.07) 1px, transparent 1px);
    background-size: 36px 36px;
}
.stats-section .section-title { color: var(--white); position: relative; }
.stats-section .section-subtitle { color: var(--primary-200); position: relative; }
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
    position: relative;
}
.stat-item { padding: 1.5rem; }
.stat-number {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}
.stat-label {
    margin-top: 0.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--primary-200);
}

/* ============================================
   TESTIMONIALS CAROUSEL
   ============================================ */
.testimonials { padding: 5rem 0; background: var(--gray-50); }
.testimonials-carousel {
    position: relative;
    max-width: 44rem;
    margin: 0 auto;
    overflow: hidden;
}
.testimonials-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.testimonial-slide { min-width: 100%; padding: 0 0.5rem; }
.testimonial-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow);
    text-align: center;
    border: 1px solid var(--gray-100);
}
.testimonial-stars {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 1.25rem;
    color: #f59e0b;
    font-size: 1.125rem;
}
.testimonial-text {
    font-size: 1.0625rem;
    color: var(--gray-600);
    line-height: 1.8;
    max-width: 34rem;
    margin: 0 auto 1.5rem;
}
.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    border-top: 1px solid var(--gray-100);
    padding-top: 1.25rem;
}
.testimonial-avatar {
    width: 2.75rem; height: 2.75rem;
    border-radius: 50%;
    background: var(--primary-100);
    color: var(--primary-600);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    font-size: 0.9375rem;
}
.testimonial-name { font-weight: 600; font-size: 0.9375rem; color: var(--gray-900); }
.testimonial-role { font-size: 0.8125rem; color: var(--gray-400); }
/* Carousel Controls */
.carousel-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}
.carousel-arrow {
    width: 2.75rem; height: 2.75rem;
    border-radius: 50%;
    background: var(--white);
    border: 2px solid var(--gray-200);
    color: var(--gray-600);
    display: flex; align-items: center; justify-content: center;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}
.carousel-arrow:hover {
    background: var(--primary-600);
    color: var(--white);
    border-color: var(--primary-600);
    box-shadow: var(--shadow-lg);
}
.carousel-dots { display: flex; gap: 0.5rem; align-items: center; }
.carousel-dot {
    width: 0.625rem; height: 0.625rem;
    border-radius: 50%;
    background: var(--gray-300);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    padding: 0;
}
.carousel-dot.active {
    background: var(--primary-600);
    width: 2rem;
    border-radius: 9999px;
}

/* ============================================
   FAQ ACCORDION
   ============================================ */
.faq { padding: 5rem 0; background: var(--white); }
.faq-list {
    max-width: 48rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.faq-item {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition);
    background: var(--white);
}
.faq-item.active {
    border-color: var(--primary-200);
    box-shadow: var(--shadow-md);
}
.faq-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--gray-900);
    text-align: left;
    transition: color var(--transition-fast);
    background: transparent;
}
.faq-btn:hover { color: var(--primary-600); }
.faq-btn-icon {
    font-size: 0.875rem;
    color: var(--gray-400);
    transition: transform var(--transition);
    flex-shrink: 0;
    margin-left: 1rem;
}
.faq-item.active .faq-btn-icon { transform: rotate(180deg); color: var(--primary-600); }
.faq-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-body-inner {
    padding: 0 1.5rem 1.25rem;
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.8;
}

/* ============================================
   CTA
   ============================================ */
.cta {
    padding: 5rem 0;
    background: var(--primary-600);
    position: relative;
    overflow: hidden;
}
.cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,0.06) 1px, transparent 1px);
    background-size: 40px 40px;
}
.cta-content {
    position: relative;
    text-align: center;
    max-width: 40rem;
    margin: 0 auto;
}
.cta-content h2 {
    font-size: 2.375rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 1rem;
    line-height: 1.25;
    letter-spacing: -0.02em;
}
.cta-content p {
    font-size: 1.125rem;
    color: var(--primary-200);
    margin-bottom: 2rem;
    line-height: 1.7;
}
.btn-white {
    background: var(--white);
    color: var(--primary-600);
    font-weight: 700;
    font-size: 1.125rem;
    padding: 1rem 2.75rem;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 50px -12px rgba(0,0,0,0.3);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition);
}
.btn-white:hover {
    background: var(--primary-50);
    transform: translateY(-3px);
    box-shadow: 0 30px 60px -12px rgba(0,0,0,0.4);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 4rem 0 1.75rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}
.footer-brand-row { display: flex; align-items: center; gap: 0.625rem; margin-bottom: 1rem; }
.footer-brand-row .nav-logo { width: 2.25rem; height: 2.25rem; border-radius: 0.625rem; }
.footer-brand-row span { font-size: 1.25rem; font-weight: 700; color: var(--white); }
.footer-about-text { font-size: 0.875rem; color: var(--gray-400); line-height: 1.7; max-width: 20rem; }
.footer-col-title { font-size: 1rem; font-weight: 600; color: var(--white); margin-bottom: 1.25rem; }
.footer-links { display: flex; flex-direction: column; gap: 0.625rem; }
.footer-links a { font-size: 0.875rem; color: var(--gray-400); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--white); }
.footer-contact-item {
    font-size: 0.875rem;
    color: var(--gray-400);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}
.footer-social-row {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
}
.footer-social-row a {
    width: 2.25rem; height: 2.25rem;
    background: var(--gray-800);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.875rem;
    color: var(--gray-400);
    transition: all var(--transition-fast);
}
.footer-social-row a:hover { background: var(--primary-600); color: var(--white); }
.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 1.75rem;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 2rem; right: 2rem;
    width: 3rem; height: 3rem;
    background: var(--primary-600);
    color: var(--white);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.125rem;
    box-shadow: var(--shadow-lg);
    z-index: 900;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
}
.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}
.back-to-top:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
}

/* --- Reveal Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: block; }
    .hero { padding: 5.5rem 0 3rem; }
    .hero-title { font-size: 2.125rem; }
    .hero-desc { font-size: 1rem; }
    .features-grid { grid-template-columns: 1fr; }
    .section-title { font-size: 1.75rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-number { font-size: 2.5rem; }
    .cta-content h2 { font-size: 1.875rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .hero-title { font-size: 1.75rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
    .stats-grid { grid-template-columns: 1fr; }
    .testimonial-card { padding: 1.75rem 1.25rem; }
}
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