/* ==========================================================================
   Mail System by Katsarov Design - GitHub Pages Styles
   ========================================================================== */

/* CSS Variables */
:root {
    /* Colors - matching WordPress admin styling */
    --color-primary: #2271b1;
    --color-primary-dark: #135e96;
    --color-primary-light: #72aee6;
    --color-secondary: #50575e;
    --color-success: #00a32a;
    --color-warning: #dba617;
    --color-error: #d63638;
    
    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-100: #f6f7f7;
    --color-gray-200: #f0f0f1;
    --color-gray-300: #dcdcde;
    --color-gray-400: #c3c4c7;
    --color-gray-500: #8c8f94;
    --color-gray-600: #646970;
    --color-gray-700: #3c434a;
    --color-gray-800: #2c3338;
    --color-gray-900: #1d2327;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    --font-size-xs: 0.75rem;
    --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;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Container */
    --container-max-width: 1200px;
}

/* Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    backdrop-filter: blur(8px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    color: var(--color-gray-900);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.nav a {
    color: var(--color-gray-700);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.nav-github {
    display: flex;
    align-items: center;
    padding: var(--spacing-2);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.nav-github:hover {
    background-color: var(--color-gray-100);
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    background-color: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-700);
    transition: all var(--transition-fast);
}

.lang-switcher:hover {
    background-color: var(--color-gray-200);
    border-color: var(--color-gray-400);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-2);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-700);
    transition: all var(--transition-fast);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    padding: 58px 0 48px;
    background:
        radial-gradient(circle at 12% 12%, #e8f3ff, transparent 32%),
        linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-100) 58%, #eef7ff 100%);
}

.hero-grid {
    display: block;
    max-width: 840px;
    margin: 0 auto;
    text-align: center;
}

.hero-content {
    max-width: none;
}

.badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    letter-spacing: 0;
}

.badge-version {
    background-color: #e8f3ff;
    color: var(--color-primary-dark);
    border: 1px solid #b7d7ef;
}

.badge-wp {
    background-color: var(--color-white);
    color: #21759b;
    border: 1px solid var(--color-gray-300);
}

.badge-php {
    background-color: var(--color-white);
    color: #5b5f98;
    border: 1px solid var(--color-gray-300);
}

.badge-license {
    background-color: #ecfdf3;
    color: #087d27;
    border: 1px solid #b9e8c7;
}

.hero h1 {
    max-width: 820px;
    margin-right: auto;
    margin-left: auto;
    font-size: clamp(2.25rem, 5vw, 4.15rem);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-5);
    line-height: 1.16;
}

.hero-description {
    max-width: 680px;
    margin-right: auto;
    margin-left: auto;
    font-size: 1.08rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-6);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-gray-700);
    border-color: var(--color-gray-300);
}

.btn-secondary:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-400);
    color: var(--color-gray-800);
}

/* ==========================================================================
   Features Section
   ========================================================================== */

.features {
    padding: var(--spacing-20) 0;
}

.features h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-12);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.feature-card {
    padding: var(--spacing-8);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background-color: var(--color-gray-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-5);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-3);
}

.feature-card p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ==========================================================================
   Technical Specs Section
   ========================================================================== */

.specs {
    padding: var(--spacing-20) 0;
    background-color: var(--color-gray-900);
}

.specs h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-12);
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-6);
}

.spec-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    padding: var(--spacing-6);
    background-color: var(--color-gray-800);
    border-radius: var(--radius-md);
    text-align: center;
}

.spec-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.spec-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-white);
}

/* ==========================================================================
   Installation Section
   ========================================================================== */

.installation {
    padding: var(--spacing-20) 0;
}

.installation h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-12);
}

.installation-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-xl);
    font-weight: 700;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-4);
}

.step-content h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.step-content p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.installation-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-6);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-md);
    color: var(--color-gray-700);
}

.installation-note svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.installation-note p {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* ==========================================================================
   Placeholders Section
   ========================================================================== */

.placeholders {
    padding: var(--spacing-20) 0;
    background-color: var(--color-gray-100);
}

.placeholders h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-4);
}

.section-description {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-10);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.placeholders-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-4);
    max-width: 900px;
    margin: 0 auto;
}

.placeholder-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding: var(--spacing-4) var(--spacing-5);
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
}

.placeholder-item code {
    padding: var(--spacing-1) var(--spacing-2);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-sm);
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: var(--font-size-sm);
    color: var(--color-primary-dark);
    white-space: nowrap;
}

.placeholder-item span {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* ==========================================================================
   Documentation Section
   ========================================================================== */

.documentation {
    padding: var(--spacing-20) 0;
}

.documentation h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-12);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-6);
}

.doc-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-8);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.doc-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.doc-card svg {
    width: 40px;
    height: 40px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-4);
}

.doc-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.doc-card p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    padding: var(--spacing-16) 0 var(--spacing-8);
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-16);
    margin-bottom: var(--spacing-12);
}

.footer-brand .logo {
    color: var(--color-white);
    margin-bottom: var(--spacing-4);
}

.footer-brand .logo-icon {
    color: var(--color-primary-light);
}

.footer-brand p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.footer-column h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-4);
}

.footer-column a {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    padding: var(--spacing-1) 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--color-gray-800);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .specs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .installation-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .docs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-10);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: var(--spacing-4) var(--spacing-6);
        background-color: var(--color-white);
        border-bottom: 1px solid var(--color-gray-200);
        gap: var(--spacing-4);
    }
    
    .nav.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero {
        padding: var(--spacing-12) 0;
    }
    
    .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
    }
    
    .features-grid,
    .specs-grid,
    .docs-grid {
        grid-template-columns: 1fr;
    }
    
    .installation-steps {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-2);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .badges {
        justify-content: flex-start;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}