:root {
    /* Light theme colors */
    --color-background: #f5f7fa;
    --color-text: #1d1d1f;
    --color-text-secondary: #515154;
    --color-primary: #0071e3;
    --color-primary-hover: #0062c3;
    --color-secondary: #f5f5f7;
    --color-secondary-hover: #e5e5e7;
    --color-border: #d2d2d7;
    --color-card-bg: #ffffff;
    --color-table-header: #f5f7fa;
    --color-table-row-alt: #f9f9f9;
    --color-modal-backdrop: rgba(0, 0, 0, 0.5);
    
    /* Badge colors */
    --color-stable: #17c158;
    --color-beta: #f2a900;
    --color-rc: #6e56cf;
    
    /* Transition */
    --transition-speed: 0.3s;
}

/* Dark theme colors */
[data-theme="dark"] {
    --color-background: #1d1d1f;
    --color-text: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-primary: #0096ff;
    --color-primary-hover: #38a8ff;
    --color-secondary: #313135;
    --color-secondary-hover: #404045;
    --color-border: #424245;
    --color-card-bg: #2c2c2e;
    --color-table-header: #2c2c2e;
    --color-table-row-alt: #323234;
}

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

html {
    font-size: 62.5%;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 1.6rem;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1.5rem;
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 4.2rem;
}

h2 {
    font-size: 3.2rem;
    margin-top: 4rem;
}

h3 {
    font-size: 2.4rem;
}

h4 {
    font-size: 2rem;
}

p {
    margin-bottom: 1.5rem;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style-type: none;
}

section {
    padding: 6rem 0;
}

/* Header */
header {
    position: sticky;
    top: 0;
    background-color: var(--color-card-bg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    z-index: 100;
    padding: 1.5rem 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 4rem;
    width: auto;
}

nav ul {
    display: flex;
    gap: 3rem;
}

nav a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 1.6rem;
}

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

.theme-toggle {
    display: flex;
    align-items: center;
}

#theme-toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    transition: background-color var(--transition-speed);
}

#theme-toggle-btn:hover {
    background-color: var(--color-secondary);
}

.sun-icon, .moon-icon {
    position: absolute;
    transition: opacity var(--transition-speed), transform var(--transition-speed);
}

[data-theme="dark"] .sun-icon {
    opacity: 1;
    transform: rotate(0);
}

[data-theme="dark"] .moon-icon {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="light"] .sun-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="light"] .moon-icon {
    opacity: 1;
    transform: rotate(0);
}

/* Hero section */
.hero {
    padding: 8rem 0;
    background: linear-gradient(135deg, var(--color-background), var(--color-secondary));
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.latest-update {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.release-info {
    color: var(--color-text-secondary);
    font-size: 1.8rem;
    margin-bottom: 3rem;
}

.version-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    font-size: 1.4rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 1rem;
}

.version-badge.stable {
    background-color: var(--color-stable);
}

.version-badge.beta {
    background-color: var(--color-beta);
}

.version-badge.rc {
    background-color: var(--color-rc);
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}

.btn {
    display: inline-block;
    padding: 1.2rem 2.4rem;
    border-radius: 0.8rem;
    font-weight: 500;
    font-size: 1.6rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    text-align: center;
}

.btn.small {
    padding: 0.6rem 1.2rem;
    font-size: 1.4rem;
}

.btn.primary {
    background-color: var(--color-primary);
    color: #fff;
    border: none;
}

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

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

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

/* Fixed aspect ratio container to prevent layout shift */
.hero-image {
    position: relative;
    width: 100%;
    height: 0;
    padding-top: 66.67%; /* 2:3 aspect ratio (400/600 = 0.6667) */
    overflow: hidden;
}

.hero-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 1.2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

/* Info cards */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 2rem;
}

.info-card {
    background-color: var(--color-card-bg);
    border-radius: 1.2rem;
    padding: 3rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.info-card h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
    margin-top: 1rem;
}

.link-arrow::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform var(--transition-speed);
}

.link-arrow:hover::after {
    transform: translateX(5px);
}

/* Version table */
.version-table-container {
    overflow-x: auto;
    margin: 3rem 0;
}

.version-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1.5rem;
}

.version-table th,
.version-table td {
    padding: 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.version-table th {
    background-color: var(--color-table-header);
    font-weight: 600;
}

.version-table tr:nth-child(even) {
    background-color: var(--color-table-row-alt);
}

.centered {
    text-align: center;
    margin-top: 3rem;
}

/* Email alert section */
.email-alerts {
    background-color: var(--color-secondary);
    padding: 8rem 0;
}

.alert-box {
    background-color: var(--color-card-bg);
    border-radius: 1.2rem;
    padding: 4rem;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.form-group {
    display: flex;
    margin: 2rem 0;
}

.form-group input {
    flex: 1;
    padding: 1.2rem 1.8rem;
    border: 1px solid var(--color-border);
    border-radius: 0.8rem 0 0 0.8rem;
    font-size: 1.6rem;
    background-color: var(--color-background);
    color: var(--color-text);
    transition: border-color var(--transition-speed);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group button {
    border-radius: 0 0.8rem 0.8rem 0;
}

.form-check {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.form-check input {
    width: 1.8rem;
    height: 1.8rem;
}

.form-check label {
    font-size: 1.4rem;
    color: var(--color-text-secondary);
}

/* Footer */
footer {
    background-color: var(--color-card-bg);
    padding: 6rem 0 2rem;
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 4rem;
    margin-bottom: 5rem;
}

.footer-col h4 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-col ul a {
    color: var(--color-text-secondary);
}

.footer-col ul a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.4rem;
}

.disclaimer {
    margin-top: 1rem;
    font-size: 1.2rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-modal-backdrop);
    z-index: 1000;
    overflow-y: auto;
}

.modal-content {
    background-color: var(--color-card-bg);
    margin: 6rem auto;
    padding: 3rem;
    border-radius: 1.2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    max-width: 600px;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    font-size: 3rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color var(--transition-speed);
}

.close-modal:hover {
    color: var(--color-text);
}

#compatibility-form {
    margin: 3rem 0;
}

#compatibility-form label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 500;
}

#compatibility-form select {
    width: 100%;
    padding: 1.2rem 1.8rem;
    border: 1px solid var(--color-border);
    border-radius: 0.8rem;
    font-size: 1.6rem;
    background-color: var(--color-background);
    color: var(--color-text);
    margin-bottom: 2rem;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23515154' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.5rem center;
    background-size: 1.6rem;
}

#compatibility-form select:focus {
    outline: none;
    border-color: var(--color-primary);
}

#compatibility-form button {
    width: 100%;
}

.result-content {
    background-color: var(--color-secondary);
    border-radius: 0.8rem;
    padding: 2rem;
    margin-top: 2rem;
}

.hidden {
    display: none;
}

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

.mt-4 {
    margin-top: 4rem;
}

.mb-4 {
    margin-bottom: 4rem;
}

/* Responsive design */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .hero-image {
        text-align: center;
    }
    
    h1 {
        font-size: 3.6rem;
    }
    
    h2 {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 56.25%;
    }
    
    header .container {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    nav ul {
        gap: 2rem;
    }
    
    .form-group {
        flex-direction: column;
    }
    
    .form-group input {
        border-radius: 0.8rem;
        margin-bottom: 1rem;
    }
    
    .form-group button {
        border-radius: 0.8rem;
    }
}

@media (max-width: 576px) {
    html {
        font-size: 50%;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.5rem 3rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 2rem;
        padding: 2rem;
    }
}