/* ===== CSS Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== Smooth Scroll ===== */
html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* ===== CSS Variables (DBOps Brand) ===== */
:root {
    /* Primary Colors (Deep Professional Blue) */
    --color-primary: #0F4C81;
    --color-primary-dark: #082A4A;
    --color-primary-light: #1A6AB8;
    --color-primary-bg: #E8F1F8;

    /* Accent Colors (Modern Teal) */
    --color-accent: #00A896;
    --color-accent-dark: #007A6C;

    /* Neutral Colors */
    --color-text: #1A1A1A;
    --color-text-secondary: #4A4A4A;
    --color-text-muted: #767676;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F7F9FB;
    --color-border: #E1E4E8;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-primary: 0 4px 20px rgba(15, 76, 129, 0.2);

    /* Container */
    --max-width: 1200px;
}

/* ===== Base Styles ===== */
body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

/* ===== Typography ===== */
h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-extrabold);
    line-height: 1.2;
    color: var(--color-text);
}

h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    color: var(--color-text);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    color: var(--color-text);
}

h4 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    line-height: 1.3;
    color: var(--color-text);
}

p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

.nav.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    min-width: 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.5px;
    color: var(--color-primary);
    overflow-wrap: break-word;
    min-width: 0;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    align-items: center;
}

.nav-links a {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: color 0.3s ease;
}

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

.nav-links a.active {
    color: var(--color-primary);
}

.nav-links a.btn-primary {
    color: white;
}

.nav-links a.btn-primary:hover {
    color: white;
}

/* Mobile Menu Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text);
    cursor: pointer;
}

/* ===== Dropdown Navigation ===== */
.nav-item {
    position: relative;
}

.nav-item.has-dropdown > a {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-item.has-dropdown > a::after {
    content: '\u25BC';
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.nav-item.has-dropdown:hover > a::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 180px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 100;
    border: 1px solid var(--color-border);
}

.nav-item.has-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu a {
    display: block;
    padding: 0.625rem var(--spacing-md);
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: all 0.2s ease;
}

.dropdown-menu a:hover {
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

/* Mobile Dropdown */
.mobile-dropdown {
    display: none;
    padding-left: var(--spacing-md);
    margin-top: 0.25rem;
}

.mobile-item.has-dropdown.open > .mobile-dropdown {
    display: block;
}

.mobile-dropdown a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.mobile-item.has-dropdown {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.mobile-item.has-dropdown > a {
    flex: 1;
}

.mobile-dropdown-toggle {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 0.7rem;
    padding: 0.75rem;
    cursor: pointer;
    transition: transform 0.3s ease;
    line-height: 1;
}

.mobile-item.has-dropdown.open > .mobile-dropdown-toggle {
    transform: rotate(180deg);
}

.mobile-item.has-dropdown > .mobile-dropdown {
    width: 100%;
}

/* ===== Sub Navigation ===== */
.sub-nav {
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.sub-nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    align-items: center;
    height: 40px;
}

.sub-nav-links a {
    font-size: 0.85rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    transition: color 0.3s ease;
}

.sub-nav-links a:hover {
    color: var(--color-primary);
}

.sub-nav-cta-item {
    margin-left: auto;
}

.sub-nav-cta {
    background: var(--color-primary);
    color: white !important;
    padding: 0.4rem 1.125rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: var(--font-weight-semibold);
    transition: all 0.3s ease;
    display: inline-block;
}

.sub-nav-cta:hover {
    background: var(--color-primary-dark);
    color: white !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-primary);
}

.sub-nav-links a.active {
    color: var(--color-primary);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    background: white;
    border-top: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
}

.mobile-menu.open {
    display: block;
}

.mobile-links {
    list-style: none;
    padding: var(--spacing-md) 0;
}

.mobile-links li a {
    display: block;
    padding: 0.625rem 0;
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: color 0.3s ease;
}

.mobile-links li a:hover,
.mobile-links li a.active {
    color: var(--color-primary);
}

.mobile-links li a.btn-primary {
    color: white;
}

.mobile-links li a.btn-primary:hover {
    color: white;
}

.mobile-section-label {
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-muted);
    padding: 0.75rem 0 0.25rem;
}

.mobile-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0.5rem 0;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: 0.95rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* ===== Section Styles ===== */
section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.section-title {
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    max-width: 320px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-extrabold);
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.footer h4 {
    color: white;
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
    transition: color 0.3s ease;
}

.footer-legal a:hover {
    color: white;
}

/* ===== Scroll Navigation Button ===== */
.scroll-nav-btn {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(15, 76, 129, 0.1);
    border: 1px solid rgba(15, 76, 129, 0.15);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    color: var(--color-primary);
    transition: all 0.3s ease;
    z-index: 999;
    opacity: 0.5;
}

.scroll-nav-btn:hover {
    opacity: 1;
    background: rgba(15, 76, 129, 0.2);
}

.scroll-nav-btn.scroll-up {
    transform: rotate(180deg);
}

/* ===== Scroll Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive: Shared Rules ===== */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .sub-nav {
        display: none;
    }

    .mobile-toggle {
        display: block;
    }

    section {
        padding: 3.5rem 0;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    section {
        padding: var(--spacing-xl) 0;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }
}