/* CSS Variables */
:root {
    --color-teal: #00b4a6;
    --color-sky-blue: #4fc3f7;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-bg: #ffffff;
    --color-bg-light: #f7fafc;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --easing-standard: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition: 0.28s var(--easing-standard);
    --max-width: 1200px;
    --header-height: 72px;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    /* We implement scroll animation in JS; keep CSS scroll behavior neutral to avoid conflicts. */
    scroll-behavior: auto;
    scroll-padding-top: 100px; /* Account for sticky header */
}

/* Reduced-motion mode is controlled via JS by setting: html[data-motion="reduced"] */
html[data-motion="reduced"] *,
html[data-motion="reduced"] *::before,
html[data-motion="reduced"] *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* Header */
.header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    z-index: 100;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.logo-img {
    height: 32px;
    width: auto;
    display: block;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition), transform var(--transition);
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-teal);
    outline: none;
}

.nav-link-cta {
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    background: var(--color-bg);
    transition: all var(--transition);
}

.nav-link-cta:hover,
.nav-link-cta:focus {
    border-color: transparent;
    color: white;
    background: linear-gradient(135deg, var(--color-teal), var(--color-sky-blue));
    box-shadow: var(--shadow-sm);
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-bg);
    transition: all var(--transition);
    align-items: center;
    justify-content: center;
}

.nav-toggle:hover,
.nav-toggle:focus {
    border-color: var(--color-teal);
    box-shadow: var(--shadow-sm);
    outline: none;
}

.nav-toggle-icon {
    width: 18px;
    height: 14px;
    display: block;
    position: relative;
    background: var(--color-text-primary);
    border-radius: 2px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 18px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle-icon::before { transform: translateY(-6px); }
.nav-toggle-icon::after { transform: translateY(6px); }

.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(6px);
}

.mobile-nav-panel {
    position: absolute;
    right: 16px;
    top: calc(var(--header-height) + 12px);
    width: min(300px, calc(100vw - 32px));
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 14px;
    display: grid;
    gap: 10px;
    transform-origin: top right;
    transform: translateY(-6px) scale(0.98);
    opacity: 0;
    animation: mobileMenuIn 160ms var(--easing-standard) forwards;
}

@keyframes mobileMenuIn {
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}
.mobile-nav-close {
    justify-self: end;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    padding: 8px 10px;
    border-radius: 10px;
    transition: all var(--transition);
    cursor: pointer;
}

.mobile-nav-close:hover,
.mobile-nav-close:focus {
    background: var(--color-bg-light);
    color: var(--color-text-primary);
    outline: none;
}

.mobile-nav-link {
    display: block;
    padding: 12px 12px;
    border-radius: 12px;
    text-decoration: none;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
    border-color: var(--color-teal);
    box-shadow: var(--shadow-sm);
    outline: none;
}

.mobile-nav-meta {
    padding: 6px 12px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

body.nav-open {
    overflow: hidden;
}

@media (max-width: 768px) {
    .header-nav { display: none; }
    .nav-toggle { display: inline-flex; }
}

/* Hero Section */
.hero {
    position: relative;
    padding: var(--spacing-2xl) 0;
    text-align: center;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../bg/hong-kong-hero-image - 1.jpeg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
    will-change: transform;
    transform: translate3d(0,0,0) scale(1.06);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 180, 166, 0.85), rgba(79, 195, 247, 0.75));
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

@media (max-width: 768px) {
    .hero {
        min-height: 500px;
    }
    .hero-background {
        background-position: center 30%;
        transform: translate3d(0,0,0) scale(1.02);
    }
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hero-locations {
    font-size: 0.875rem;
    letter-spacing: 0.04em;
    color: rgba(255, 255, 255, 0.9);
    margin-top: -0.25rem;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.12);
}

.hero-headline {
    font-size: 2.5rem;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtext {
    font-size: 1.125rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.1);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-headline {
        font-size: 1.875rem;
    }
    
    .hero-subtext {
        font-size: 1rem;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    background: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-teal), var(--color-sky-blue));
    color: white;
}

.btn-primary:hover:not(:disabled),
.btn-primary:focus:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    outline: none;
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.btn-secondary:hover,
.btn-secondary:focus {
    border-color: var(--color-teal);
    color: var(--color-teal);
    outline: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-copy {
    margin-top: var(--spacing-sm);
}

/* Section Styles */
section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
    text-align: center;
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-teal), var(--color-sky-blue));
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

@media (max-width: 768px) {
    section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

/* Services Section */
.services {
    background-color: var(--color-bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.service-card {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border-light);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-teal), var(--color-sky-blue));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.service-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
}

.service-card:active {
    transform: translateY(-2px);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-title {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.service-title-icon {
    width: 22px;
    height: 22px;
    color: var(--color-teal);
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.service-title-icon svg {
    width: 22px;
    height: 22px;
}

.service-card:hover .service-title-icon {
    color: var(--color-sky-blue);
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .service-title {
        font-size: 1.125rem;
    }
    .service-title-icon,
    .service-title-icon svg {
        width: 20px;
        height: 20px;
    }
}

.service-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Why CloudBridge Section */
.why-cloudbridge {
    position: relative;
    overflow: hidden;
}

.why-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../bg/hong-kong-hero-image - 1.jpeg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
    will-change: transform;
    transform: translate3d(0,0,0) scale(1.06);
}

.why-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 180, 166, 0.92), rgba(79, 195, 247, 0.88));
    z-index: 1;
}

.why-cloudbridge .container {
    position: relative;
    z-index: 2;
}

.why-cloudbridge .section-title {
    color: white;
}

.why-cloudbridge .section-title::after {
    background: rgba(255, 255, 255, 0.8);
}

.proof-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.proof-point {
    text-align: center;
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.35);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.proof-point:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.proof-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    min-height: 2.6em; /* Ensures consistent height for 2-line titles */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.proof-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .proof-points {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    .why-cloudbridge .section-title {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-md);
    }
    .proof-points {
        margin-top: var(--spacing-md);
    }
}

/* Contact Section */
.contact {
    background-color: var(--color-bg-light);
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-subtext {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.contact-form {
    text-align: left;
    margin-top: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: all var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-teal);
    box-shadow: 0 0 0 3px rgba(0, 180, 166, 0.1);
}

.form-group input.error,
.form-group textarea.error {
    border-color: #e53e3e;
    box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1);
}

.form-group input:disabled,
.form-group textarea:disabled,
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loader {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

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

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    display: none;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-message.success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message.error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.social-links {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
}

.social-intro {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.social-icons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border-radius: 50%;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    line-height: 0;
}

.social-link svg {
    width: 18px;
    height: 18px;
    display: block;
    flex-shrink: 0;
}

.social-link-button {
    border: 1px solid var(--color-border);
}

.social-link-button:focus {
    outline: none;
}

/* Honeypot (avoid display:none to reduce autofill weirdness) */
.hp-field {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* WeChat modal */
.wechat-modal {
    position: fixed;
    inset: 0;
    z-index: 300;
}

.wechat-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(6px);
}

.wechat-modal-panel {
    position: relative;
    margin: 10vh auto 0;
    width: min(360px, calc(100vw - 32px));
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    box-shadow: var(--shadow-lg);
    padding: 16px;
    text-align: center;
}

.wechat-modal-close {
    position: absolute;
    top: 10px;
    right: 10px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    border-radius: 10px;
    padding: 6px 10px;
    cursor: pointer;
    transition: all var(--transition);
}

.wechat-modal-close:hover,
.wechat-modal-close:focus {
    border-color: var(--color-teal);
    box-shadow: var(--shadow-sm);
    outline: none;
}

.wechat-modal-title {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-top: 8px;
    margin-bottom: 12px;
}

.wechat-modal-qr {
    width: 240px;
    height: 240px;
    max-width: 100%;
    border-radius: 14px;
    border: 1px solid var(--color-border-light);
    background: var(--color-bg);
}

.wechat-modal-handle {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.social-link:hover:not([onclick]),
.social-link:focus:not([onclick]) {
    color: white;
    background: linear-gradient(135deg, var(--color-teal), var(--color-sky-blue));
    border-color: transparent;
    transform: translateY(-3px) scale(1.1);
    box-shadow: var(--shadow-md);
    outline: none;
}

.social-link[onclick] {
    opacity: 0.5;
    cursor: default;
}


/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    background-color: var(--color-bg);
}

.footer-content {
    text-align: center;
}

.copyright {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.legal {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    line-height: 1.5;
}

/* Focus Styles for Accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--color-teal);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .hero-cta,
    .contact-cta,
    .btn {
        display: none;
    }
}