/* CSS Reset and Base Styles */
/* Universal box-sizing for consistent layout calculations */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Variables - Color Scheme */
:root {
    /* Light background color scheme */
    --bg-primary: #FAFAFA;
    --bg-white: #FFFFFF;
    --bg-gray: #f3f3f3;
    --text-primary: #1A1A1A;
    --text-secondary: #2D2D2D;
    --accent-color: #0066CC;
    --error-color: #DC3545;
    --success-color: #28A745;
    --focus-outline: 2px solid var(--accent-color);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-family-primary: 'Figtree', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --line-height-base: 1.6;
}

/* Base Typography - Responsive using clamp() */
/* Fluid typography scales between 16px (mobile) and 18px (desktop) */
body {
    font-family: var(--font-family-primary);
    font-size: clamp(16px, 2vw, 18px);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    background-image: url('../images/y-so-serious-white.png');
    background-repeat: repeat;
    background-attachment: fixed;
    background-color: rgba(255,255,255,0.6);
    background-blend-mode: darken;
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

p {
    font-size: clamp(1rem, 2vw, 1.125rem);
    margin-bottom: var(--spacing-sm);
}

/* Skip Navigation Link */
.skip-link {
    position: absolute;
    top: -45px;
    left: 0;
    background: var(--accent-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Mobile-first Responsive Breakpoints */
/* Mobile: < 768px (default, no media query) */

/* Tablet: 768px and up */
@media (min-width: 768px) {
    body {
        font-size: clamp(17px, 1.5vw, 18px);
    }
}

/* Desktop: 1024px and up */
@media (min-width: 1024px) {
    body {
        font-size: 18px;
    }
}

/* Header and Navigation */
header {
    padding: var(--spacing-sm) var(--spacing-md);
    position: fixed;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    top: 0;
    z-index: 10;
    max-width: 1920px;
    left: 50%;
    transform: translateX(-50%);
}

/* Mobile and Tablet: Sticky header */
@media (max-width: 1023px) {
    header {
        position: absolute;
        background-color: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        transform: none;
        left: 0;
    }
    .hero-content {
        margin-bottom:0px !important;
    }
}

/* Desktop: Fixed header (overlay style) */
@media (min-width: 1024px) {
    header {
        position: fixed;
        background-color: rgba(255, 255, 255, 0.5);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
    }
}

/* Header Brand (Logo + Text) */
.header-brand {
    display: flex;
    align-items: center;
}

.header-brand-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: inherit;
}

.header-logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.header-brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

@media (min-width: 768px) {
    .header-logo {
        width: 60px;
        height: 60px;
    }
    
    .header-brand-text {
        font-size: 1.5rem;
    }
}

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

.nav-link {
    padding: var(--spacing-xs) var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.2s;
    position: relative;
}

.nav-link:hover {
    color: var(--accent-color);
    background-color: rgba(0, 102, 204, 0.1);
}

.nav-link:focus {
    outline: var(--focus-outline);
    outline-offset: 2px;
}

.nav-link.active {
    color: var(--accent-color);
    font-weight: 700;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--spacing-md);
    right: var(--spacing-md);
    height: 2px;
    background-color: var(--accent-color);
}

/* Main Content */
main {
    max-width: 1920px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

/* Add top padding on mobile/tablet to prevent header overlap when sticky */
@media (max-width: 1023px) {
    main {
        padding-top: calc(var(--spacing-lg) + 80px);
    }
    
    .open-letter {
        padding-top: calc(var(--spacing-xl) + 80px);
    }
}

/* Home Page Hero Section */
.home-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
    text-align: center;
    background-color: var(--bg-gray);
    background-image: none;
}

.home-main {
    padding: 0;
    max-width: 1920px;
}

/* Desktop: Full-screen background image */
@media (min-width: 1024px) {
    .home-hero {
        background-image: url('../images/desktop-paperbreak-hero.webp');
        background-size: cover;
        background-position: center center;
        background-repeat: no-repeat;
        background-attachment: fixed;
        min-height: 100vh;
        position: relative;
        align-items: flex-start;
        justify-content: center;
        padding-left: 0;
        padding-right: 0;
        text-align: left;
    }
    
    .home-hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: inherit;
        z-index: 0;
    }
    
    .hero-content,
    .hero-form {
        position: relative;
        z-index: 1;
        width: 50%;
        max-width: 50%;
        margin-left: 0;
        margin-right: auto;
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-xl);
    }
    
    .hero-mobile-image {
        display: none;
    }
    
    .hero-content {
        background-color: transparent;
        padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-md);
        border-radius: 0;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        margin-bottom: 0;
        margin-left: 0;
        margin-right: auto;
    }
    
    .hero-form {
        background-color: transparent;
        padding: 0 var(--spacing-xl) var(--spacing-xl);
        border-radius: 0;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        margin-top: 0;
        margin-left: 0;
        margin-right: auto;
    }
}

/* Mobile/Tablet: Image at bottom */
@media (max-width: 1023px) {
    .home-hero {
        min-height: auto;
        padding: calc(var(--spacing-xl) + 80px) var(--spacing-md) 0;
        padding-bottom: 0;
        background-image: none;
    }
    
    .hero-content {
        max-width: 100%;
        padding-top: 20px;
    }
    
    .hero-form {
        margin-bottom: var(--spacing-xl);
        width: 100%;
    }
    
    .hero-mobile-image {
        display: block;
        width: 100%;
        height: auto;
        margin-top: -30px;
        margin-bottom: 0;
        padding: 0;
    }
}

.hero-content {
    max-width: 800px;
    margin: 0;
    z-index: 1;
    text-align: left;
}

.home-hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 600;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.8;
}

.hero-form {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
    z-index: 1;
}

@media (min-width: 768px) {
    .home-hero {
        padding: var(--spacing-xl) var(--spacing-lg);
        padding-top: 150px;
    }
    
    .hero-content {
        margin-bottom: var(--spacing-xl);
    }
}

.open-letter {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .open-letter {
        padding: var(--spacing-xl) var(--spacing-lg);
        padding-top: 100px;
    }
}

.open-letter h1 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.open-letter h2 {
    color: var(--text-secondary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.open-letter p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-base);
}


.form-container {
    margin-left: -30px !important;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: 1rem;
    font-family: var(--font-family-primary);
    border: 2px solid #ddd;
    border-radius: 4px;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: var(--focus-outline);
    outline-offset: 2px;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-group input:invalid:not(:focus):not(:placeholder-shown) {
    border-color: var(--error-color);
}

.error-message {
    display: block;
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    min-height: 1.5rem;
}

.success-message {
    display: block;
    color: var(--success-color);
    font-size: 1rem;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: #d4edda;
    border: 1px solid var(--success-color);
    border-radius: 4px;
    text-align: center;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1.125rem;
    font-weight: 700;
    font-family: var(--font-family-primary);
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: var(--spacing-md);
}

.submit-btn:hover:not(:disabled) {
    background-color: #0052a3;
}

.submit-btn:focus {
    outline: var(--focus-outline);
    outline-offset: 2px;
}

.submit-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    opacity: 0.7;
}

/* Responsive adjustments for form */
@media (min-width: 768px) {
    
    .form-group input {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .form-container {
        min-height: 319px;
    }
}

/* Image Styling */
.letter-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: var(--spacing-lg) auto;
    border-radius: 8px;
}

@media (min-width: 768px) {
    .letter-image {
        max-width: 500px;
    }
}

/* Footer */
footer {
    width: 100%;
    background-color: var(--bg-white);
    padding: var(--spacing-xl) var(--spacing-md);
    box-shadow: 0 -12px 20px rgba(196, 195, 195, 0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.footer-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.footer-brand {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.footer-row p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-row a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.footer-row a:hover {
    text-decoration: underline;
}

.footer-row a:focus {
    outline: var(--focus-outline);
    outline-offset: 2px;
    border-radius: 2px;
}