/* Main Styles */
:root {
    /* Colors */
    --color-primary: #000000;
    --color-secondary: #1a1a1a;
    --color-accent: #2a2a2a;
    --color-bg: #ffffff;
    --color-bg-light: #f5f5f5;
    --color-bg-gray: #e8e8e8;
    --color-text: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-text-light: #7a7a7a;
    --color-border: #d4d4d4;
    --color-overlay: rgba(0, 0, 0, 0.4);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --container-width: 1440px;
    --container-padding: 2rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layering */
    --z-overlay: 10000;
    --z-cursor-follower: 2147483646;
    --z-cursor: 2147483647;

    /* Shadows - Premium refined */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1), 0 8px 24px rgba(0, 0, 0, 0.06);
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-light: rgba(255, 255, 255, 0.5);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-blur: blur(20px);
    --glass-blur-light: blur(12px);
    
    /* Premium highlights */
    --highlight-subtle: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    --highlight-edge: 0 1px 0 rgba(255, 255, 255, 0.1) inset;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    overflow-x: hidden;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-family: 'Vazir', Tahoma, sans-serif;
    font-size: 0.9375rem;
    font-weight: 500;
    letter-spacing: normal;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1.5px solid transparent;
    position: relative;
    overflow: hidden;
    min-width: 180px;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15), var(--highlight-edge);
}

.btn-primary:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--color-text);
    border-color: var(--color-text);
    backdrop-filter: var(--glass-blur-light);
    -webkit-backdrop-filter: var(--glass-blur-light);
}

.btn-outline:hover {
    background-color: var(--color-text);
    color: #fff;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

/* White outline button for dark backgrounds */
.btn-outline-white {
    background-color: rgba(255, 255, 255, 0.08);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: var(--glass-blur-light);
    -webkit-backdrop-filter: var(--glass-blur-light);
}

.btn-outline-white:hover {
    background-color: #fff;
    color: var(--color-text);
    border-color: #fff;
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.text-link {
    display: inline-block;
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 4px;
    font-size: var(--text-base);
    transition: opacity var(--transition-base);
}

.text-link:hover {
    opacity: 0.8;
}

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

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

/* Loading State */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Fade In Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-slow) ease-out;
}

/* Responsive Images */
img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* Selection */
::selection {
    background-color: var(--color-text);
    color: #fff;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--color-text-light);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text);
}

/* Media Queries */
@media (max-width: 1024px) {
    :root {
        --container-padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .btn {
        padding: 0.875rem 2rem;
        font-size: 0.875rem;
        min-width: 160px;
    }
}