/* ===================================
   Professional Responsive Design System
   Global Enhancements for Full Page
   =================================== */

/* ===================================
   CSS Custom Properties
   =================================== */
:root {
    /* Color Palette */
    --primary-blue: #38b6ff;
    --primary-dark-blue: #004a94;
    --text-dark: #1a1a1a;
    --text-medium: #606060;
    --text-light: #808080;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e5e5e5;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    --spacing-2xl: 80px;
    
    /* Typography */
    --font-primary: 'Heebo', sans-serif;
    --font-secondary: 'Exo', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;
    --font-size-4xl: 42px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 40px rgba(0, 74, 148, 0.15);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-medium);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* ===================================
   Container System
   =================================== */
.container-responsive {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid-responsive {
    width: 100%;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Section Spacing
   =================================== */
.section-responsive {
    padding: var(--spacing-2xl) 0;
}

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

/* ===================================
   Grid System
   =================================== */
.grid-responsive {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

.grid-responsive.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-responsive.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ===================================
   Typography Classes
   =================================== */
.heading-responsive {
    font-family: var(--font-secondary);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.heading-responsive.h1 {
    font-size: var(--font-size-4xl);
}

.heading-responsive.h2 {
    font-size: var(--font-size-3xl);
}

.heading-responsive.h3 {
    font-size: var(--font-size-2xl);
}

.heading-responsive.h4 {
    font-size: var(--font-size-xl);
}

.text-responsive {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-medium);
}

.text-responsive.text-lg {
    font-size: var(--font-size-lg);
}

.text-responsive.text-sm {
    font-size: var(--font-size-sm);
}

/* ===================================
   Button System
   =================================== */
.btn-responsive {
    display: inline-block;
    padding: 14px 32px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-smooth);
    cursor: pointer;
    border: 2px solid transparent;
    font-family: var(--font-secondary);
}

.btn-responsive.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark-blue) 100%);
    color: var(--bg-white);
    border-color: transparent;
}

.btn-responsive.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-responsive.btn-outline {
    background: transparent;
    color: var(--primary-dark-blue);
    border-color: var(--primary-dark-blue);
}

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

/* ===================================
   Card System
   =================================== */
.card-responsive {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-smooth);
}

.card-responsive:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.card-responsive .card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.card-responsive .card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
}

.card-responsive .card-description {
    font-size: var(--font-size-base);
    color: var(--text-medium);
    line-height: 1.6;
}

/* ===================================
   Form Elements
   =================================== */
.form-responsive .form-group {
    margin-bottom: var(--spacing-md);
}

.form-responsive label {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.form-responsive input[type="text"],
.form-responsive input[type="email"],
.form-responsive input[type="tel"],
.form-responsive textarea,
.form-responsive select {
    width: 100%;
    padding: 12px 16px;
    font-size: var(--font-size-base);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    font-family: var(--font-primary);
}

.form-responsive input:focus,
.form-responsive textarea:focus,
.form-responsive select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(56, 182, 255, 0.1);
}

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

/* ===================================
   Image Optimization
   =================================== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

.img-responsive {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

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

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* ===================================
   Tablet Responsive - 768px to 991px
   =================================== */
@media screen and (max-width: 991px) {
    :root {
        --font-size-4xl: 36px;
        --font-size-3xl: 32px;
        --font-size-2xl: 24px;
        --spacing-2xl: 60px;
        --spacing-xl: 50px;
    }
    
    .container-responsive {
        padding: 0 var(--spacing-sm);
    }
    
    .grid-responsive.grid-3,
    .grid-responsive.grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-responsive {
        padding: var(--spacing-xl) 0;
    }
    
    .btn-responsive {
        padding: 12px 28px;
    }
}

/* ===================================
   Mobile Responsive - 481px to 767px
   =================================== */
@media screen and (max-width: 767px) {
    :root {
        --font-size-4xl: 28px;
        --font-size-3xl: 26px;
        --font-size-2xl: 22px;
        --font-size-xl: 20px;
        --spacing-2xl: 50px;
        --spacing-xl: 40px;
        --spacing-lg: 30px;
    }
    
    .grid-responsive.grid-2,
    .grid-responsive.grid-3,
    .grid-responsive.grid-4 {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .section-responsive {
        padding: var(--spacing-lg) 0;
    }
    
    .btn-responsive {
        padding: 12px 24px;
        font-size: var(--font-size-sm);
    }
    
    .card-responsive {
        padding: var(--spacing-md);
    }
    
    /* Mobile Navigation Improvements */
    .d-md-none {
        display: none;
    }
    
    .d-md-block {
        display: block;
    }
}

/* ===================================
   Small Mobile - 320px to 480px
   =================================== */
@media screen and (max-width: 480px) {
    :root {
        --font-size-4xl: 24px;
        --font-size-3xl: 22px;
        --font-size-2xl: 20px;
        --font-size-xl: 18px;
        --font-size-base: 15px;
        --spacing-2xl: 40px;
        --spacing-xl: 32px;
        --spacing-lg: 24px;
        --spacing-md: 20px;
    }
    
    .container-responsive {
        padding: 0 var(--spacing-sm);
    }
    
    .btn-responsive {
        width: 100%;
        padding: 14px 20px;
    }
}

/* ===================================
   Large Desktop - 1200px and above
   =================================== */
@media screen and (min-width: 1200px) {
    .container-responsive {
        max-width: 1320px;
    }
}

@media screen and (min-width: 1400px) {
    .container-responsive {
        max-width: 1440px;
    }
}

/* ===================================
   Accessibility Enhancements
   =================================== */
:focus-visible {
    outline: 3px solid var(--primary-blue);
    outline-offset: 2px;
}

.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;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===================================
   Loading Animation
   =================================== */
.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===================================
   Fade In Animations
   =================================== */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    body {
        color: #000;
        background: #fff;
    }
    
    .no-print {
        display: none !important;
    }
    
    a[href]:after {
        content: " (" attr(href) ")";
    }
    
    .btn-responsive,
    button {
        border: 1px solid #000;
        background: transparent !important;
        color: #000 !important;
    }
}