/* Comprehensive Responsive Design Enhancements */

/* ===== STANDARDIZED BREAKPOINTS ===== */
/* 
  Mobile First Approach:
  - xs: 0-479px (Extra small phones)
  - sm: 480-767px (Small phones, large phones)
  - md: 768-1023px (Tablets)
  - lg: 1024-1199px (Small desktops)
  - xl: 1200px+ (Large desktops)
*/

/* ===== ROOT VARIABLES FOR RESPONSIVE DESIGN ===== */
:root {
    /* Responsive spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Responsive font sizes */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;
    --font-4xl: 2.25rem;
    --font-5xl: 3rem;
    
    /* Touch target minimum size */
    --touch-target: 44px;
    
    /* Container max widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1200px;
}

/* ===== GLOBAL RESPONSIVE IMPROVEMENTS ===== */

/* Ensure all interactive elements meet touch target requirements */
button, 
a, 
input[type="button"], 
input[type="submit"], 
input[type="checkbox"], 
input[type="radio"],
.download-btn,
.signup-btn,
.footer-download-btn {
    min-height: var(--touch-target);
    min-width: var(--touch-target);
}

/* Improve text selection and readability */
::selection {
    background: var(--green-accent);
    color: var(--white);
}

/* Smooth scrolling for better UX */
html {
    scroll-behavior: smooth;
}

/* ===== RESPONSIVE TYPOGRAPHY ===== */
/* Fluid typography that scales with viewport */
h1 {
    font-size: clamp(1.75rem, 4vw, 3.5rem);
    line-height: 1.2;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    line-height: 1.3;
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.875rem);
    line-height: 1.4;
}

p, li {
    font-size: clamp(0.875rem, 2vw, 1.125rem);
    line-height: 1.6;
}

/* ===== RESPONSIVE CONTAINERS ===== */
.container-responsive {
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 480px) {
    .container-responsive {
        padding: 0 var(--spacing-md);
    }
}

@media (min-width: 768px) {
    .container-responsive {
        padding: 0 var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .container-responsive {
        max-width: var(--container-lg);
    }
}

@media (min-width: 1200px) {
    .container-responsive {
        max-width: var(--container-xl);
    }
}

/* ===== ENHANCED MOBILE NAVIGATION ===== */
@media (max-width: 1023px) {
    /* Hide download button from navbar on mobile */
    .nav-right .download-btn {
        display: none !important;
    }
    
    /* Improve hamburger menu visibility */
    .hamburger {
        display: flex !important;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: var(--touch-target);
        height: var(--touch-target);
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 1002;
    }
    
    .hamburger span {
        width: 24px;
        height: 3px;
        background: var(--heading-color);
        margin: 2px 0;
        transition: all 0.3s ease;
        border-radius: 2px;
        display: block;
    }
    
    /* White hamburger menu for volunteer page */
    .volunteer-page .hamburger span {
        background: var(--white) !important;
    }
    
    /* Enhanced mobile menu */
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        padding: 1.5rem 2rem !important;
        flex-direction: column;
        gap: 0.25rem !important;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 1001;
        border-bottom: 1px solid var(--border-color);
        box-sizing: border-box;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links a {
        font-size: var(--font-lg);
        padding: 0.5rem 0 !important;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        text-align: left;
    }
    
    .nav-links a:last-child {
        border-bottom: none;
    }
    
    /* Remove green underline on mobile */
    .nav-links a::after,
    .nav-center .nav-links a::after {
        display: none !important;
        content: '' !important;
        width: 0 !important;
        height: 0 !important;
        background: transparent !important;
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after,
    .nav-center .nav-links a:hover::after,
    .nav-center .nav-links a.active::after {
        display: none !important;
        content: '' !important;
        width: 0 !important;
        background: transparent !important;
    }
    
    /* Hamburger animation */
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
        transform: scale(0);
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

/* ===== RESPONSIVE FOOTER ENHANCEMENTS ===== */
@media (max-width: 767px) {
    footer {
        padding: var(--spacing-xl) 0 var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        padding: 0 var(--spacing-sm);
    }
    
    .footer-section ul {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
    
    .footer-download-section {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
    
    .footer-download-btn {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-base);
    }
    
    .footer-bottom {
        padding: var(--spacing-lg) var(--spacing-sm) 0;
    }
}

/* ===== RESPONSIVE FORM IMPROVEMENTS ===== */
@media (max-width: 767px) {
    .contact-form-modern,
    .contact-info-modern {
        min-width: 100%;
        padding: var(--spacing-lg);
    }
    
    .contact-form-modern input,
    .contact-form-modern textarea {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: var(--spacing-md);
    }
    
    .contact-info-card {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .contact-info-icon {
        align-self: center;
    }
}

/* ===== RESPONSIVE IMAGE OPTIMIZATION ===== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Lazy loading enhancement */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* ===== RESPONSIVE GRID IMPROVEMENTS ===== */
.responsive-grid {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: 1fr;
}

@media (min-width: 480px) {
    .responsive-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-lg);
    }
}

@media (min-width: 768px) {
    .responsive-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: var(--spacing-xl);
    }
}

/* ===== RESPONSIVE CARD COMPONENTS ===== */
.responsive-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-lg);
    transition: all 0.3s ease;
}

@media (max-width: 767px) {
    .responsive-card {
        padding: var(--spacing-md);
        margin: 0 var(--spacing-sm);
    }
}

.responsive-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

/* ===== RESPONSIVE BUTTON IMPROVEMENTS ===== */
@media (max-width: 767px) {
    .download-btn:not(.footer-download-btn),
    .signup-btn {
        width: 100%;
        max-width: 300px;
        margin: var(--spacing-sm) auto;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-base);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
}

/* ===== RESPONSIVE HERO IMPROVEMENTS ===== */
@media (max-width: 767px) {
    .new-hero {
        padding: var(--spacing-lg) var(--spacing-sm) var(--spacing-lg);
        min-height: calc(100vh - var(--header-height));
    }
    
    .hero-content {
        text-align: center;
        max-width: 100%;
    }
    
    .hero-content h1 {
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-subtitle {
        margin-bottom: var(--spacing-xl);
        font-size: var(--font-lg);
    }
}

/* ===== RESPONSIVE SCREEN CONTAINERS ===== */
@media (max-width: 767px) {
    .screen-container {
        padding: var(--spacing-lg) var(--spacing-sm);
        gap: var(--spacing-lg);
    }
    
    .screen-content {
        padding: var(--spacing-md) 0;
        text-align: center;
    }
    
    .screen-content h2 {
        font-size: clamp(1.5rem, 4vw, 2rem);
        margin-bottom: var(--spacing-md);
    }
    
    .screen-content p {
        font-size: var(--font-base);
        line-height: 1.6;
    }
}

/* ===== STAY UPDATED SECTION MOBILE FIXES ===== */
@media (max-width: 767px) {
    .stay-updated {
        background: var(--light-gray) !important;
        padding: 3rem 0 !important;
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    .updated-container {
        display: flex !important;
        flex-direction: column !important;
        gap: 2rem !important;
        padding: 0 1rem !important;
        max-width: 100% !important;
    }
    
    .updated-left,
    .updated-right {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        width: 100% !important;
        max-width: 100% !important;
    }
    
    .cards-container {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        height: auto !important;
        min-height: 200px !important;
    }
    
    .card {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        position: relative !important;
        transform: none !important;
        margin-bottom: 1rem !important;
    }
    
    .card.active {
        opacity: 1 !important;
        transform: none !important;
    }
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
/* Focus indicators */
*:focus {
    outline: 2px solid var(--green-accent);
    outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--heading-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
    border-radius: 4px;
}

.skip-link:focus {
    top: 6px;
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
/* 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;
    }
}

/* Hardware acceleration for smooth animations */
.download-btn,
.signup-btn,
.footer-download-btn,
.screen-container,
.feature-card,
.responsive-card {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Optimize repaints and reflows */
.screen-image img,
.feature-image img,
.contact-info-icon {
    will-change: transform;
}

/* Critical resource hints for better performance */
@media (max-width: 767px) {
    /* Reduce box shadows on mobile for better performance */
    .feature-card,
    .responsive-card,
    .contact-form-modern,
    .contact-info-card {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    }
    
    .feature-card:hover,
    .responsive-card:hover {
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }
}

/* Optimize font loading */
@font-face {
    font-family: 'Noto Sans';
    font-display: swap; /* Improves loading performance */
}

/* Reduce layout shifts */
img {
    aspect-ratio: attr(width) / attr(height);
}

/* Optimize touch interactions */
@media (hover: none) and (pointer: coarse) {
    /* Remove hover effects on touch devices */
    .download-btn:hover,
    .signup-btn:hover,
    .footer-download-btn:hover,
    .feature-card:hover,
    .responsive-card:hover {
        transform: none;
        box-shadow: inherit;
    }
    
    /* Add active states for touch */
    .download-btn:active,
    .signup-btn:active,
    .footer-download-btn:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a,
    a:visited {
        text-decoration: underline;
    }
    
    .nav-links,
    .hamburger,
    .download-btn,
    .signup-btn {
        display: none !important;
    }
    
    .screen-container {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}

/* ===== HIGH CONTRAST MODE SUPPORT ===== */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --heading-color: #000000;
        --body-text-color: #000000;
    }
    
    .download-btn,
    .signup-btn {
        border: 2px solid #000000;
    }
}

/* ===== DARK MODE SUPPORT (Future Enhancement) ===== */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here when needed */
}

/* ===== LANDSCAPE ORIENTATION OPTIMIZATIONS ===== */
@media (max-height: 500px) and (orientation: landscape) {
    .new-hero {
        min-height: 100vh;
        padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-lg);
    }
    
    .hero-content h1 {
        font-size: clamp(1.5rem, 3vh, 2.5rem);
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-subtitle {
        font-size: var(--font-base);
        margin-bottom: var(--spacing-md);
    }
    
    .screen-container {
        min-height: 100vh;
        padding: var(--spacing-md) var(--spacing-sm);
    }
}