/* ============================================
   K3 WALLS - Global Styles
   ============================================ */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Vibrant Dark Theme Color Palette - Random Colors */
    --primary-color: #00d9ff; /* Cyan */
    --primary-dark: #00b8d9;
    --primary-light: #33e0ff;
    --secondary-color: #ff006e; /* Hot Pink */
    --accent-color: #7b2cbf; /* Purple */
    
    /* Dark Background Colors - Perfect for Wallpapers */
    --text-primary: #ffffff; /* White */
    --text-secondary: #e0e0e0;
    --text-light: #b0b0b0;
    --bg-primary: #0a0a0f; /* Very Dark Blue-Black */
    --bg-secondary: #12121a; /* Dark Blue-Gray */
    --bg-dark: #050508; /* Almost Black */
    --bg-glass: rgba(18, 18, 26, 0.85);
    
    /* Vibrant Border & Shadow */
    --border-color: rgba(0, 217, 255, 0.3);
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 24px;
    --shadow-sm: 0 2px 8px 0 rgba(0, 217, 255, 0.2);
    --shadow-md: 0 4px 16px -2px rgba(0, 217, 255, 0.3), 0 2px 8px -1px rgba(255, 0, 110, 0.2);
    --shadow-lg: 0 12px 32px -4px rgba(0, 217, 255, 0.35), 0 8px 20px -4px rgba(255, 0, 110, 0.25);
    --shadow-xl: 0 24px 48px -8px rgba(0, 217, 255, 0.4), 0 16px 32px -8px rgba(123, 44, 191, 0.3);
    --shadow-glow: 0 0 40px rgba(0, 217, 255, 0.5), 0 0 80px rgba(255, 0, 110, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Poppins', 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;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Base Styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

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

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

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

a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}


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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(0, 217, 255, 0.4), 0 4px 12px rgba(255, 0, 110, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 32px rgba(0, 217, 255, 0.5), 0 8px 16px rgba(255, 0, 110, 0.4), 0 0 40px rgba(0, 217, 255, 0.3);
}

.btn-primary:hover:not(:disabled)::before {
    left: 100%;
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(0, 217, 255, 0.1);
    box-shadow: 0 0 15px rgba(0, 217, 255, 0.3);
    transform: translateY(-2px);
}

/* Form Elements */
.form-input {
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
    color: var(--text-light);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: #ef4444;
}

/* Utility Classes */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.text-center {
    text-align: center;
}

.text-primary {
    color: var(--primary-color);
}

.text-secondary {
    color: var(--text-secondary);
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

/* Scroll progress bar - fixed at bottom */
.scroll-progress-wrap {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-secondary);
    z-index: 9997;
    pointer-events: none;
}

.scroll-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.08s ease-out;
    box-shadow: 0 0 12px rgba(0, 217, 255, 0.6);
}