/* ---
   Montaura Website Stylesheet
   Based on the Strategic Blueprint
--- */

/* =======================
   0. Global & Variables
   ======================== */
   :root {
    --bg-dark: #121212;
    --bg-deep: #1A1A1A;
    --bg-card: #242424;
    --border-color: #333333;
    
    --primary-accent: #00A3FF; /* 一个充满活力的电光蓝 */
    --primary-accent-dark: #007acc;

    --text-primary: #EAEAEA;
    --text-secondary: #A0A0A0;
    --text-dark: #FFFFFF;

    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    --container-width: 1200px;
    --border-radius: 8px;
    --transition-speed: 0.3s;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* 导航栏高度 */
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-family-base);
    line-height: 1.7;
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* =======================
   1. Reusable Components & Typography
   ======================== */
h1, h2, h3, h4 {
    color: var(--text-dark);
    font-weight: 700;
    line-height: 1.2;
    margin-top: 0;
}

.hero-title { font-size: 3.5rem; margin-bottom: 1.5rem; }
.section-title { font-size: 2.5rem; margin-bottom: 1rem; text-align: center; }
.section-subtitle { font-size: 1.1rem; color: var(--text-secondary); max-width: 700px; margin: 0 auto 4rem auto; text-align: center; }

a { color: var(--primary-accent); text-decoration: none; transition: color var(--transition-speed) ease; }
a:hover { color: var(--text-dark); }

.cta-button, .secondary-button {
    display: inline-block;
    padding: 14px 28px;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    border: 2px solid transparent;
}
.cta-button { background-color: var(--primary-accent); color: var(--bg-dark); font-weight: 700; }
.cta-button:hover { background-color: var(--primary-accent-dark); transform: translateY(-3px); }
.secondary-button { background-color: transparent; border-color: var(--border-color); color: var(--text-primary); }
.secondary-button:hover { background-color: var(--primary-accent); border-color: var(--primary-accent); color: var(--bg-dark); }

.card-link { font-weight: 500; }
.card-link:hover { text-decoration: underline; }

.bg-deep { background-color: var(--bg-deep); }
.content-section { padding: 6rem 0; }
.section-intro-text { text-align: center; color: var(--text-secondary); margin-bottom: 2rem; }

/* Scroll Animation */
.fade-in, .fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =======================
   2. Header & Navigation
   ======================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease;
}
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}
.nav-logo { font-size: 1.8rem; font-weight: 800; color: var(--text-dark); }
.nav-menu { list-style: none; display: flex; gap: 2.5rem; margin: 0; padding: 0; }
.nav-link { color: var(--text-secondary); font-weight: 500; position: relative; padding: 5px 0; }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-accent);
    transition: width var(--transition-speed) ease;
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link:hover, .nav-link.active { color: var(--text-dark); }
.nav-cta { padding: 10px 20px; }

/* =======================
   3. Sections Styling
   ======================== */
/* Hero Section */
.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    text-align: center;
    padding-top: 80px; /* Nav height */
}
.hero-buttons { display: flex; justify-content: center; gap: 1rem; margin-top: 2.5rem; }

/* Client Logos */
.client-logos-section { padding: 3rem 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.logos-grid { display: flex; justify-content: space-around; align-items: center; gap: 2rem; flex-wrap: wrap; }
.logos-grid i { font-size: 2.5rem; color: var(--text-secondary); transition: color var(--transition-speed) ease; }
.logos-grid i:hover { color: var(--text-primary); }

/* Solutions Section */
.solutions-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.solution-card { background-color: var(--bg-card); padding: 2.5rem; border-radius: var(--border-radius); border: 1px solid var(--border-color); transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease; }
.solution-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }
.card-icon { font-size: 2rem; color: var(--primary-accent); margin-bottom: 1.5rem; }
.solution-card h3 { margin-bottom: 1rem; }
.solution-card .problem { color: var(--text-secondary); font-style: italic; border-left: 3px solid var(--primary-accent); padding-left: 1rem; margin-bottom: 1rem; }

/* Work Section */
.work-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.work-item { background-color: var(--bg-card); border-radius: var(--border-radius); overflow: hidden; position: relative; }
.work-item img { width: 100%; display: block; transition: transform 0.4s ease; }
.work-item:hover img { transform: scale(1.05); }
.work-info { padding: 1.5rem; }
.section-cta-container { text-align: center; margin-top: 4rem; }

/* About Section */
.about-container { display: flex; align-items: center; gap: 4rem; }
.about-text { flex: 1; }
.about-image { flex: 1; }
.about-image img { width: 100%; border-radius: var(--border-radius); }
.text-left { text-align: left; }

/* Insights Section */
.insights-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.insight-card { display: block; background-color: var(--bg-card); padding: 2rem; border-radius: var(--border-radius); border: 1px solid var(--border-color); transition: all var(--transition-speed) ease; }
.insight-card:hover { transform: translateY(-5px); border-color: var(--primary-accent); }
.insight-category { display: inline-block; background-color: var(--primary-accent); color: var(--bg-dark); padding: 4px 10px; border-radius: 4px; font-size: 0.8rem; font-weight: 700; margin-bottom: 1rem; }
.insight-excerpt { color: var(--text-secondary); }

/* Contact Section */
.contact-section { padding: 6rem 0; background: linear-gradient(to top, var(--bg-dark), var(--bg-deep)); }
.contact-wrapper { display: flex; gap: 4rem; background-color: var(--bg-card); padding: 4rem; border-radius: var(--border-radius); border: 1px solid var(--border-color); }
.contact-info { flex: 1; }
.contact-info h3 { font-size: 2rem; }
.direct-contact { margin: 2rem 0; }
.direct-contact p { font-size: 1.1rem; }
.direct-contact i { color: var(--primary-accent); margin-right: 1rem; }
.reassurance { color: var(--text-secondary); font-size: 0.9rem; }
.contact-form-container { flex: 1.2; }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; font-weight: 500; margin-bottom: 0.5rem; color: var(--text-secondary); }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-family-base);
    transition: border-color var(--transition-speed) ease;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-accent);
}
.contact-form-container .cta-button { width: 100%; }

/* =======================
   4. Footer
   ======================== */
.main-footer { background-color: var(--bg-dark); border-top: 1px solid var(--border-color); padding-top: 4rem; }
.footer-container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 2rem; padding-bottom: 4rem; }
.footer-about, .footer-links, .footer-contact { flex: 1; min-width: 250px; }
.footer-about h4, .footer-links h4, .footer-contact h4 { font-size: 1.2rem; color: var(--text-dark); margin-bottom: 1rem; }
.footer-about p, .footer-links a, .footer-contact p { color: var(--text-secondary); }
.footer-links ul { list-style: none; padding: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-bottom { border-top: 1px solid var(--border-color); padding: 1.5rem 0; }
.bottom-container { display: flex; justify-content: space-between; align-items: center; color: var(--text-secondary); font-size: 0.9rem; }
.legal-links a, .legal-links span { color: var(--text-secondary); margin: 0 0.5rem; }

/* =======================
   5. Responsive Design
   ======================== */
@media (max-width: 992px) {
    .nav-menu { display: none; } /* Simplification for this example. A real site would use a hamburger menu. */
    .about-container { flex-direction: column; }
    .work-grid, .insights-grid { grid-template-columns: 1fr; }
    .contact-wrapper { flex-direction: column; }
}

@media (max-width: 768px) {
    .hero-title { font-size: 2.5rem; }
    .section-title { font-size: 2rem; }
    .container { padding: 0 1rem; }
    .solutions-grid { grid-template-columns: 1fr; }
    .footer-container, .bottom-container { flex-direction: column; text-align: center; gap: 1.5rem; }
}