/* ============================================================================
   GLOBAL STYLES & CSS VARIABLES
   ============================================================================ */

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-light: #f8fafc;
    --color-dark: #1e293b;
    --color-border: #e2e8f0;
    --color-text: #334155;
    --color-text-light: #94a3b8;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --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: 1.875rem;
    --font-size-4xl: 2.25rem;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition: all 0.3s ease-in-out;
    --transition-fast: all 0.15s ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: #ffffff;
}

/* ============================================================================
   CONTAINER & LAYOUT
   ============================================================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

main {
    min-height: calc(100vh - 200px);
}

/* ============================================================================
   NAVIGATION BAR
   ============================================================================ */

.navbar {
    background-color: #ffffff;
    border-bottom: 2px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
}

.navbar-brand {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    color: var(--color-dark);
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 0;
    width: 100%;
}

.navbar-menu li {
    flex: 1;
}

.nav-link {
    display: block;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    cursor: pointer;
    text-align: center;
    border-bottom: 3px solid transparent;
    background-color: transparent;
}

.nav-link:hover {
    background-color: #f1f5f9;
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.nav-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
    background-color: #f1f5f9;
}

.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background-color: #dbeafe;
    font-weight: 600;
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.footer {
    background-color: var(--color-dark);
    color: #ffffff;
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer .container {
    padding: var(--spacing-2xl) var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

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

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

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: #ffffff;
}

.footer-section p {
    color: #cbd5e1;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #cbd5e1;
    font-size: var(--font-size-sm);
}

/* ============================================================================
   CARD COMPONENTS
   ============================================================================ */

.card {
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--color-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 5px;
}

.card-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: cover;
    object-position: center;
    transition: var(--transition);
    background-color: var(--color-light);
}

.card:hover .card-image img {
    transform: scale(1.03);
}

.card-content {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
    flex-grow: 1;
    margin-bottom: var(--spacing-md);
}

.card-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: auto;
}

/* Card Feature Variant */

.card-feature {
    text-align: center;
}

.card-feature .card-image {
    display: none;
}

.card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #dbeafe;
    border-radius: 50%;
    font-size: var(--font-size-2xl);
}

.card-feature .card-content {
    text-align: center;
}

.card-feature .card-title {
    text-align: center;
}

.card-feature .card-description {
    text-align: center;
}

.card-feature .card-actions {
    justify-content: center;
}

/* Card Testimonial Variant */

.card-testimonial {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border: none;
}

.card-testimonial .card-quote {
    color: var(--color-primary);
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    font-size: var(--font-size-lg);
    font-style: italic;
    color: var(--color-dark);
    margin-bottom: var(--spacing-lg);
    margin-right: 0.5rem;
    margin-left: 0.5rem;
    line-height: var(--line-height-relaxed);
    text-align: center;
}

.testimonial-text::before {
    content: '〝';
    font-size: 1.5rem;
    margin-right: 0.5rem;
    color: var(--color-primary);
    opacity: 0.5;
}

.testimonial-text::after {
    content: '〞';
    font-size: 1.5rem;
    margin-left: 0.5rem;
    color: var(--color-primary);
    opacity: 0.5;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.author-info {
    flex-grow: 1;
}

.author-name {
    font-weight: 600;
    margin-left: 0.5rem;
    color: var(--color-dark);
    margin-bottom: var(--spacing-xs);
}

.card-testimonial .author-name {
    margin-top: auto;
}

/* Card Grid */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

/* ============================================================================
   BUTTON COMPONENTS
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    outline: none;
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:disabled,
.btn-disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Default */

.btn-default {
    background-color: var(--color-light);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-default:hover:not(:disabled) {
    background-color: var(--color-border);
}

.btn-default:active:not(:disabled) {
    background-color: #cbd5e1;
}

/* Button Primary */

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

.btn-primary:hover:not(:disabled) {
    background-color: #1d4ed8;
}

.btn-primary:active:not(:disabled) {
    background-color: #1e40af;
}

/* Button Secondary */

.btn-secondary {
    background-color: var(--color-secondary);
    color: #ffffff;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #475569;
}

.btn-secondary:active:not(:disabled) {
    background-color: #334155;
}

/* Button Outline */

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

.btn-outline:hover:not(:disabled) {
    background-color: #dbeafe;
}

.btn-outline:active:not(:disabled) {
    background-color: #bfdbfe;
}

/* Button Sizes */

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
    display: flex;
}

/* Button Icon */

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
}

.btn-text {
    display: inline;
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #667eea 100%);
    color: #ffffff;
    padding: var(--spacing-2xl) var(--spacing-md);
    text-align: center;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero .container {
    padding: var(--spacing-2xl) var(--spacing-md);
}

.hero h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-tight);
}

.hero p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

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

/* ============================================================================
   SECTION STYLES
   ============================================================================ */

section {
    padding: var(--spacing-2xl) var(--spacing-md);
}

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

section h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-xl);
    color: var(--color-dark);
}

section h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    color: var(--color-dark);
}

section p {
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
    :root {
        --font-size-base: 0.95rem;
        --font-size-lg: 1rem;
        --font-size-xl: 1.1rem;
        --font-size-2xl: 1.35rem;
        --font-size-3xl: 1.6rem;
        --font-size-4xl: 1.9rem;
    }

    .navbar .container {
        flex-direction: column;
        gap: 0;
    }

    .navbar-menu {
        gap: 0;
        width: 100%;
    }

    .navbar-menu li {
        flex: 1;
    }

    .nav-link {
        padding: var(--spacing-sm) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

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

    .hero {
        min-height: 300px;
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero h1 {
        font-size: var(--font-size-2xl);
    }

    .hero p {
        font-size: var(--font-size-base);
    }

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

    .btn {
        width: 100%;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    section {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .testimonial-author {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }

    .card-grid {
        gap: var(--spacing-md);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    .navbar-menu {
        gap: var(--spacing-sm);
    }

    .nav-link {
        font-size: var(--font-size-sm);
    }
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

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

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

.text-right {
    text-align: right;
}

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

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

.px-1 { padding: 0 var(--spacing-md); }
.px-2 { padding: 0 var(--spacing-lg); }
.px-3 { padding: 0 var(--spacing-xl); }

.py-1 { padding: var(--spacing-md) 0; }
.py-2 { padding: var(--spacing-lg) 0; }
.py-3 { padding: var(--spacing-xl) 0; }