/* DSA Official Website - Global Styles */

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

:root {
    /* Brand Colors */
    --primary-blue: #1D5D9B;
    --primary-dark-blue: #164A7A;
    --accent-red: #B91C50;
    --accent-red-dark: #960F3D;

    /* Neutral Colors */
    --white: #FFFFFF;
    --light-gray: #F5F7FA;
    --medium-gray: #E0E4E9;
    --text-gray: #4A5568;
    --dark-gray: #2D3748;
    --black: #1A202C;

    /* Typography */
    --font-primary: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Roboto', 'Helvetica Neue', Arial, sans-serif;

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

    /* Container */
    --container-max: 1200px;
    --container-wide: 1400px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--dark-gray);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--black);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
    font-weight: 800;
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
}

h3 {
    font-size: 2rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-gray);
    font-size: 1.0625rem;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

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

.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background-color: var(--light-gray);
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-heading);
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-medium);
    text-decoration: none;
    line-height: 1.5;
}

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

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

.btn-secondary {
    background-color: var(--accent-red);
    color: var(--white);
}

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

.btn-outline {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* ==================== Navigation ==================== */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--primary-blue);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-md);
    max-width: var(--container-wide);
    margin: 0 auto;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.navbar-logo img {
    height: 50px;
    width: auto;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    font-family: var(--font-heading);
}

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

.navbar-menu > li {
    position: relative;
}

.navbar-menu a {
    font-weight: 500;
    color: var(--dark-gray);
    transition: color var(--transition-fast);
    font-size: 1rem;
}

.navbar-menu a:hover {
    color: var(--primary-blue);
}

.navbar-menu .btn {
    margin-left: var(--spacing-sm);
}

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

.navbar-menu .btn-secondary {
    color: var(--white);
}

/* Dropdown Menu Styles */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.dropdown-arrow {
    font-size: 0.625rem;
    transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    min-width: 220px;
    list-style: none;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-medium);
}

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

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--dark-gray);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
    background: var(--light-gray);
    color: var(--primary-blue);
    padding-left: 1.5rem;
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
}

.navbar-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ==================== Footer ==================== */
.footer {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.85);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-logo {
    margin-bottom: var(--spacing-md);
}

.footer-logo img {
    height: 60px;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-md);
    text-align: center;
    color: white;
    font-size: 0.875rem;
}

.footer-bottom p {
    color: var(--white);
}

.footer-bottom a {
    color: var(--white);
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: rgba(255, 255, 255, 0.9);
}

/* ==================== Hero Section ==================== */
.hero {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark-blue) 100%);
    color: var(--white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero h1 {
    color: var(--white);
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 800;
}

.hero .subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.hero .description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

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

/* ==================== Cards ==================== */
.card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-medium);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

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

.card-grid-2col {
    grid-template-columns: repeat(2, 1fr);
}

.card-grid-3col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* ==================== Feature Section ==================== */
.feature-icon {
    width: 60px;
    height: 60px;
    background-color: var(--accent-red);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.feature-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.feature-list li {
    padding-left: var(--spacing-lg);
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-red);
    font-weight: 700;
    font-size: 1.25rem;
}

/* ==================== Section Headers ==================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.section-header .underline {
    width: 80px;
    height: 4px;
    background-color: var(--accent-red);
    margin: 0 auto var(--spacing-md);
}

.section-header p {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.125rem;
}

/* ==================== CTA Sections ==================== */
.cta-section {
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--accent-red-dark) 100%);
    color: var(--white);
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.cta-section h2 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

/* ==================== FAQ Section ==================== */
.faq-item {
    background-color: var(--white);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.faq-question {
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.faq-answer {
    color: var(--text-gray);
    line-height: 1.7;
}

/* FAQ Tabs */
.faq-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.faq-tab {
    background-color: var(--white);
    border: 2px solid var(--medium-gray);
    color: var(--text-gray);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-primary);
}

.faq-tab:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    background-color: var(--light-gray);
}

.faq-tab.active {
    background-color: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
}

.faq-tab.active:hover {
    background-color: var(--primary-dark-blue);
    border-color: var(--primary-dark-blue);
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 1.875rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero .subtitle {
        font-size: 1.25rem;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-toggle {
        display: flex;
    }

    /* Mobile dropdown styles */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--light-gray);
        margin-top: 0.5rem;
        margin-bottom: 0.5rem;
        border-radius: var(--radius-sm);
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

    .dropdown-toggle {
        width: 100%;
        justify-content: space-between;
    }

    .dropdown-arrow {
        margin-left: auto;
    }

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

    .faq-tab {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }

    .faq-tabs {
        gap: 0.375rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* ==================== Form Elements ==================== */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--dark-gray);
    background-color: var(--white);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(29, 93, 155, 0.1);
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="tel"]::placeholder,
input[type="number"]::placeholder,
textarea::placeholder {
    color: var(--text-gray);
    opacity: 0.6;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark-gray);
}

/* ==================== Utility Classes ==================== */
.text-center {
    text-align: center;
}

.text-primary {
    color: var(--primary-blue);
}

.text-accent {
    color: var(--accent-red);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.py-1 { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-2 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-3 { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-4 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }