/* --- Variables --- */
:root {
    --color-primary: #1a3a5c;
    --color-primary-light: #2d5f8a;
    --color-accent: #e8a838;
    --color-accent-hover: #d49620;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f9fc;
    --color-bg-dark: #0f2237;
    --color-text: #2c3e50;
    --color-text-light: #6c7a89;
    --color-text-muted: #95a5a6;
    --color-border: #e8ecf1;
    --color-white: #ffffff;
    --color-success: #27ae60;
    --color-error: #e74c3c;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

img {
    max-width: 100%;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-primary);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    box-shadow: 0 8px 25px rgba(232, 168, 56, 0.35);
}

.btn-primary:hover,
.btn-outline:hover {
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--color-white);
}

.btn-full {
    width: 100%;
}

.btn-sm {
    padding: 8px 20px;
    font-size: var(--font-size-sm);
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.logo-img {
    height: 48px;
    width: auto;
}

/* Navigation */
.nav-list {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    transition: color var(--transition);
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

.nav-link.contact-btn {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.nav-link.contact-btn:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
}

.nav-link.contact-btn::after {
    display: none;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: var(--font-size-sm);
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    padding: 4px 6px;
    transition: color var(--transition);
    font-family: var(--font-family);
}

.lang-btn.active {
    color: var(--color-primary);
    font-weight: 700;
}

.lang-btn:hover {
    color: var(--color-primary);
}

.lang-divider {
    color: var(--color-border);
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    color: var(--color-white);
    overflow: hidden;
    padding: 120px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, #0a1e33 0%, #1a3a5c 40%, #2d5f8a 100%),
        radial-gradient(ellipse 70% 50% at 80% 50%, rgba(232, 168, 56, 0.12) 0%, transparent 70%),
        radial-gradient(ellipse 50% 40% at 20% 80%, rgba(45, 95, 138, 0.3) 0%, transparent 70%);
    z-index: -2;
}

.hero-content {
    max-width: 720px;
    text-align: center;
    margin: 0 auto;
}

.hero-tag {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 12px;
    padding: 8px 16px;
    border: 1px solid rgba(232, 168, 56, 0.3);
    border-radius: 50px;
}

.hero-tag-sub {
    display: block;
    font-size: var(--font-size-xs);
    letter-spacing: 1px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.hero-title em {
    font-style: normal;
    background: linear-gradient(135deg, #e8a838 0%, #f0c860 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-line {
    white-space: nowrap;
}

.hero-highlight {
    color: #e8a838;
}

.hero-desc {
    font-size: var(--font-size-xl);
    line-height: 1.8;
    color: rgba(255,255,255,0.8);
    margin: 0 auto 40px;
    max-width: 600px;
}

.hero-btns {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
    justify-content: center;
}

/* Hero Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.15);
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: rgba(255,255,255,0.6);
}

/* --- Sections --- */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

html[lang="en"] .section-title {
    font-size: var(--font-size-4xl);
}

.section-desc {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    line-height: 1.8;
}

.desc-list-left {
    text-align: left;
}

#why-us .section-desc,
#how-we-do .section-desc {
    text-align: left;
    white-space: pre-line;
}

/* --- Who We Are --- */
html[lang="zh"] #who-we-are .section-tag {
    font-size: var(--font-size-lg);
}

html[lang="en"] .en-hide {
    display: none !important;
}

html[lang="zh"] .zh-hide {
    display: none !important;
}

.who-desc-list {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}

.who-desc-list p {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 12px;
    padding-left: 20px;
    position: relative;
}

.who-desc-list p::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

.who-desc-list p:last-child {
    margin-bottom: 0;
}

.who-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.who-card {
    background: var(--color-white);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.who-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.who-icon {
    width: 56px;
    height: 56px;
    color: var(--color-accent);
    margin-bottom: 24px;
    flex-shrink: 0;
}

.who-card h3,
.service-card h3,
.feature-text h3 {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.who-card h3 {
    font-size: var(--font-size-xl);
}

.service-card h3 {
    font-size: var(--font-size-lg);
}

.feature-text h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 8px;
}

.who-card p {
    color: var(--color-text-light);
    line-height: 1.75;
    font-size: var(--font-size-base);
}

.who-card p[data-i18n="who.card5.desc"] {
    text-align: center;
}

html[lang="en"] .who-card p[data-i18n="who.card5.desc"] {
    text-align: left;
}

/* --- What We Do --- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--color-white);
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
    transition: all var(--transition);
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

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

.service-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-border);
    margin-bottom: 16px;
    transition: color var(--transition);
}

.service-card:hover .service-number {
    color: var(--color-accent);
}

.service-card p,
.feature-text p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* --- How We Do --- */
.how-flow {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.step-content p {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    line-height: 1.8;
}

.step-icon {
    flex-shrink: 0;
    width: 96px;
    height: 96px;
    background: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    box-shadow: var(--shadow-md);
    z-index: 1;
    transition: all var(--transition);
    padding: 20px;
}

.step-icon:hover {
    color: var(--color-accent);
    transform: scale(1.08);
}

.step-content h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.how-step {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    position: relative;
    padding: 24px 0;
}

.how-step:hover .step-icon {
    color: var(--color-accent);
    transform: scale(1.08);
}

/* --- Why Choose Us --- */
.why-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.why-feature {
    display: flex;
    gap: 24px;
    padding: 28px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.why-feature:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border);
}

.feature-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(232, 168, 56, 0.1);
    border-radius: var(--radius-sm);
}

/* --- Contact --- */
.contact {
    background: var(--color-bg-alt);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: start;
}

.contact-info .section-title {
    font-size: var(--font-size-5xl);
    margin-bottom: 20px;
}

.contact-info .section-desc {
    margin-bottom: 36px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--color-white);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
    padding: 10px;
}

.contact-item h4 {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.contact-item p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.contact-item a[href^="mailto"],
.contact-item a[href^="tel"] {
    color: inherit;
    transition: color var(--transition);
}

.contact-item a[href^="mailto"]:hover,
.contact-item a[href^="tel"]:hover {
    color: var(--color-accent);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--color-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: all var(--transition);
    background: var(--color-bg);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.08);
    background: var(--color-white);
}

.form-group input.invalid,
.form-group textarea.invalid {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

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

.form-note {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* Form Success */
.form-success {
    display: none;
    text-align: center;
    padding: 60px 20px;
}

.form-success-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.form-success h3 {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: 12px;
}

.form-success p {
    color: var(--color-text-light);
}

/* --- Footer --- */
.footer {
    background: var(--color-bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 80px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 2fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand p,
.footer-newsletter p {
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

.footer-brand p {
    margin-top: 20px;
}

.footer-links h4,
.footer-newsletter h4 {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: var(--font-size-sm);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-newsletter p {
    margin-bottom: 16px;
}

.newsletter-form {
    display: flex;
    gap: 8px;
}

.newsletter-form input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.08);
    color: var(--color-white);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    outline: none;
    transition: border-color var(--transition);
}

.newsletter-form input::placeholder {
    color: rgba(255,255,255,0.4);
}

.newsletter-form input:focus {
    border-color: var(--color-accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: var(--font-size-sm);
}

.footer-bottom a {
    color: rgba(255,255,255,0.6);
    transition: color var(--transition);
}

.footer-bottom a:hover {
    color: var(--color-accent);
}

.footer-legal {
    display: flex;
    gap: 24px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.8rem;
        --font-size-4xl: 2rem;
    }

    .who-grid,
    .services-grid,
    .why-features,
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.2rem;
        --font-size-4xl: 1.8rem;
        --font-size-3xl: 1.5rem;
    }

    /* Mobile Nav */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-white);
        box-shadow: var(--shadow-xl);
        padding: 100px 32px 40px;
        transition: right var(--transition);
        z-index: 1000;
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 8px;
        align-items: stretch;
    }

    .nav-link {
        display: block;
        padding: 12px 0;
        font-size: var(--font-size-lg);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-link.contact-btn {
        text-align: center;
        margin-top: 16px;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .hero-btns {
        flex-direction: column;
    }

    .who-grid {
        grid-template-columns: 1fr;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .how-step {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .step-icon {
        margin: 0 auto;
    }

    .why-features {
        grid-template-columns: 1fr;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .section {
        padding: 60px 0;
    }

    .contact-form-wrapper {
        padding: 24px;
    }
}

/* --- Mobile Nav Overlay --- */
.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* --- CIPMR Advantage Equation --- */
.why-equation {
    display: flex;
    justify-content: center;
    margin-top: 24px;
}

.why-equation-inner {
    display: inline-block;
}

.why-equation-title {
    font-weight: 700;
    margin-bottom: 10px;
}

.why-equation-items > * {
    line-height: 1.8;
}

.why-equation-line-solid {
    display: block;
    border-top: 3px solid #000;
    margin: 12px 0 8px 0;
    width: 100%;
}

.why-equation-result {
    display: block;
    font-weight: 700;
    color: #000;
    text-align: left;
}