/* ==========================================================================
   SAYL Website Styles — RTL-first, accessible, no external dependencies
   ========================================================================== */

/* CSS Custom Properties — Theme Tokens */
:root {
    /* Colors — WCAG AA compliant contrast ratios */
    --color-bg: #fafafa;
    --color-bg-elevated: #ffffff;
    --color-text: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #6b6b8a;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-focus: #3b82f6;
    --color-secondary: #64748b;
    --color-secondary-hover: #475569;
    --color-border: #e2e8f0;
    --color-border-focus: #2563eb;
    --color-success: #059669;
    --color-warning: #d97706;
    --color-error: #dc2626;
    --color-disabled: #94a3b8;
    --color-disabled-bg: #f1f5f9;
    --color-code-bg: #f8fafc;
    --color-code-border: #e2e8f0;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Typography */
    --font-sans: system-ui, -apple-system, "Segoe UI", "Noto Sans Arabic", "Tahoma", sans-serif;
    --font-mono: "Cascadia Code", "Fira Code", "Consolas", monospace;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --leading-tight: 1.2;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    /* Layout */
    --container-max: 72rem;
    --header-height: 4rem;
}

/* Dark mode (opt-in via media query) */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-bg-elevated: #1e293b;
        --color-text: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --color-primary: #3b82f6;
        --color-primary-hover: #60a5fa;
        --color-primary-focus: #60a5fa;
        --color-secondary: #94a3b8;
        --color-secondary-hover: #cbd5e1;
        --color-border: #334155;
        --color-code-bg: #1e293b;
        --color-code-border: #334155;
        --color-disabled: #64748b;
        --color-disabled-bg: #1e293b;
    }
}

/* Reduced motion */
@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;
    }
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    direction: rtl;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus visible for keyboard navigation */
:focus {
    outline: none;
}

:focus-visible {
    outline: 3px solid var(--color-primary-focus);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -100%;
    right: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 10000;
    font-weight: 600;
}

.skip-link:focus {
    top: var(--space-md);
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--leading-tight);
    font-weight: 700;
    color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

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

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

a:focus-visible {
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-code-bg);
    border: 1px solid var(--color-code-border);
    padding: 0.125em 0.375em;
    border-radius: var(--radius-sm);
}

pre {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    background: var(--color-code-bg);
    border: 1px solid var(--color-code-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    overflow-x: auto;
    margin-bottom: var(--space-md);
}

pre code {
    background: transparent;
    border: 0;
    padding: 0;
    font-size: inherit;
}

ul, ol {
    padding-right: var(--space-xl);
    margin-bottom: var(--space-md);
}

li {
    margin-bottom: var(--space-xs);
    color: var(--text-secondary);
}

strong {
    color: var(--color-text);
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-2xl);
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    margin: var(--space-sm) auto 0;
    border-radius: var(--radius-full);
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: var(--space-lg);
}

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

.brand:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.logo {
    width: 36px;
    height: 36px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.brand-name {
    font-size: var(--text-xl);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.brand-tag {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
    padding: 0;
    margin: 0;
}

.main-nav a {
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--space-xs) 0;
    position: relative;
}

.main-nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    left: 0;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-fast);
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
    transform: scaleX(1);
}

.main-nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-bg-elevated);
    color: var(--color-text);
    font-weight: 600;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.lang-toggle:hover {
    border-color: var(--color-primary);
    background: var(--color-bg);
}

.lang-toggle:focus-visible {
    border-color: var(--color-primary-focus);
}

.lang-toggle[aria-pressed="true"] {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
    padding: var(--space-3xl) 0;
    text-align: center;
}

.hero-title {
    font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.hero-subtitle {
    display: block;
    font-weight: 400;
    font-size: clamp(var(--text-lg), 3vw, var(--text-xl));
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.hero-description {
    font-size: var(--text-lg);
    max-width: 42rem;
    margin: var(--space-lg) auto var(--space-xl);
    color: var(--text-secondary);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-xl);
}

.hero-meta {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-xl);
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    color: #fff;
    text-decoration: none;
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
}

/* ==========================================================================
   Features
   ========================================================================== */
.features {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: #fff;
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    margin-bottom: var(--space-sm);
}

.feature-card p {
    margin: 0;
    font-size: var(--text-base);
}

/* ==========================================================================
   Download
   ========================================================================== */
.download {
    padding: var(--space-3xl) 0;
}

.download-note {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: var(--space-2xl);
    font-size: var(--text-base);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.download-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
}

.platform-badge {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: var(--color-bg);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-full);
    padding: var(--space-xs) var(--space-md);
    margin-bottom: var(--space-md);
}

.download-card h3 {
    margin-bottom: var(--space-sm);
    font-size: var(--text-lg);
}

.download-desc {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
}

.artifact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.artifact-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text);
    font-weight: 600;
    font-size: var(--text-base);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.artifact-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-bg-elevated);
    color: var(--color-primary);
    text-decoration: none;
}

.artifact-btn:disabled,
.artifact-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
    border-color: var(--color-disabled);
    color: var(--color-disabled);
    background: var(--color-disabled-bg);
}

.artifact-status {
    font-size: var(--text-xs);
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.artifact-status.available {
    background: #dcfce7;
    color: var(--color-success);
}

.artifact-status.unavailable {
    background: #fef2f2;
    color: var(--color-error);
}

.artifact-status.checking {
    background: #fffbeb;
    color: var(--color-warning);
}

@media (prefers-color-scheme: dark) {
    .artifact-status.available {
        background: #064e3b;
        color: #86efac;
    }
    .artifact-status.unavailable {
        background: #7f1d1d;
        color: #fca5a5;
    }
    .artifact-status.checking {
        background: #78350f;
        color: #fcd34d;
    }
}

/* Checksums */
.checksums {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    max-width: 48rem;
    margin: 0 auto;
    text-align: center;
}

.checksums h3 {
    margin-bottom: var(--space-sm);
}

.checksums > p {
    margin-bottom: var(--space-lg);
}

.checksum-help {
    margin-top: var(--space-lg);
    text-align: right;
    direction: rtl;
}

.checksum-help summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-primary);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.checksum-help summary:hover {
    background: var(--color-bg);
}

.checksum-help-content {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
}

.checksum-help-content pre {
    margin: var(--space-sm) 0;
    text-align: left;
    direction: ltr;
}

/* ==========================================================================
   Requirements
   ========================================================================== */
.requirements {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.requirements-list {
    list-style: none;
    padding: 0;
    max-width: 48rem;
    margin: 0 auto var(--space-lg);
}

.requirements-list li {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.requirements-list strong {
    flex-shrink: 0;
    min-width: 120px;
    color: var(--color-text);
}

.requirements-list span {
    flex: 1;
    min-width: 200px;
    color: var(--text-secondary);
}

.requirements-note {
    text-align: center;
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ==========================================================================
   Privacy
   ========================================================================== */
.privacy {
    padding: var(--space-3xl) 0;
}

.privacy-statement {
    max-width: 48rem;
    margin: 0 auto;
}

.privacy-core {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    text-align: center;
    padding: var(--space-xl);
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2xl);
    color: var(--color-text);
}

.privacy-statement h3 {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.privacy-list {
    list-style: none;
    padding: 0;
}

.privacy-list li {
    position: relative;
    padding-right: var(--space-2xl);
    padding-left: var(--space-md);
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

.privacy-list li::before {
    content: "✓";
    position: absolute;
    right: 0;
    top: 0;
    color: var(--color-success);
    font-weight: 700;
    font-size: var(--text-lg);
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.faq-list {
    max-width: 48rem;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    overflow: hidden;
}

.faq-item summary {
    padding: var(--space-lg);
    font-weight: 600;
    font-size: var(--text-base);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    color: var(--color-text);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    font-size: var(--text-xl);
    font-weight: 300;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover {
    background: var(--color-bg-elevated);
}

.faq-answer {
    padding: 0 var(--space-lg) var(--space-lg);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

.faq-answer p {
    margin-bottom: var(--space-md);
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.faq-answer ul {
    padding-right: var(--space-xl);
}

.faq-answer li {
    margin-bottom: var(--space-xs);
}

.planned-label {
    margin-bottom: var(--space-md);
    color: var(--color-warning);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: var(--text-lg);
    color: var(--color-text);
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-nav a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

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

.footer-meta {
    font-size: var(--text-sm);
    color: var(--text-muted);
    white-space: nowrap;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
        height: auto;
        padding: var(--space-md) 0;
        gap: var(--space-md);
    }

    .main-nav ul {
        order: 3;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--space-md);
        padding-top: var(--space-md);
        border-top: 1px solid var(--color-border);
    }

    .hero {
        padding: var(--space-2xl) 0;
    }

    .features,
    .download,
    .requirements,
    .privacy,
    .faq {
        padding: var(--space-2xl) 0;
    }

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

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

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-nav {
        order: -1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
        --space-3xl: 2.5rem;
    }

    .main-nav ul {
        gap: var(--space-sm);
    }

    .main-nav a {
        font-size: var(--text-sm);
        padding: var(--space-xs);
    }

    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--text-sm);
    }

    .artifact-btn {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--text-sm);
    }
}

/* ==========================================================================
   Print
   ========================================================================== */
@media print {
    .site-header,
    .hero-actions,
    .artifact-btn,
    .lang-toggle,
    .skip-link {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    a {
        color: #000;
        text-decoration: underline;
    }

    .feature-card,
    .download-card,
    .checksums,
    .requirements-list li,
    .privacy-core,
    .faq-item {
        border: 1px solid #ccc;
        break-inside: avoid;
    }
}