/**
 * XK Contact Form - Stylesheet
 * 
 * Modern dark theme with gradient accents
 * for multimedia company aesthetic
 */

/* ============================================================
   CSS Variables / Design Tokens
   ============================================================ */
:root {
    /* Colors */
    --color-bg-dark: #0a0a1a;
    --color-bg-card: #12122a;
    --color-bg-input: #1a1a35;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-focus: rgba(102, 126, 234, 0.5);
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0c0;
    --color-text-muted: #666680;
    
    --color-accent-primary: #667eea;
    --color-accent-secondary: #764ba2;
    --color-accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    
    /* Typography */
    --font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, 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: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Borders */
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ============================================================
   Base Styles
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-dark);
    background-image: 
        radial-gradient(ellipse at top, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    min-height: 100vh;
}

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
    line-height: 1.2;
}

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); }

p {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-accent-secondary);
}

/* ============================================================
   Page Layout
   ============================================================ */
.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: var(--spacing-xl);
}

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) 0;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ============================================================
   Contact Form Card
   ============================================================ */
.form-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.form-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-accent-gradient);
}

.form-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.form-header h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.form-header p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ============================================================
   Form Elements
   ============================================================ */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.form-label .required {
    color: var(--color-error);
    margin-left: 2px;
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
    outline: none;
}

.form-control:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a0a0c0' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

/* Row with two columns */
.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 576px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   Honeypot (Anti-Spam)
   ============================================================ */
.hp-field {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    width: 0;
    overflow: hidden;
}

/* ============================================================
   Submit Button
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary {
    color: #ffffff;
    background: var(--color-accent-gradient);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* Loading spinner */
.btn .spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.btn.loading .spinner {
    display: block;
}

.btn.loading .btn-text {
    opacity: 0.7;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================================
   Alert Messages
   ============================================================ */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    display: none;
}

.alert.show {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: slideIn 0.3s ease;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--color-success);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-error);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.site-footer a {
    color: var(--color-text-muted);
}

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

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-card {
    animation: fadeInUp 0.6s ease-out;
}

/* ============================================================
   Responsive Adjustments
   ============================================================ */
@media (max-width: 768px) {
    .page-wrapper {
        padding: var(--spacing-md);
    }
    
    .form-card {
        padding: var(--spacing-lg);
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
}

/* ============================================================
   Form Validation States
   ============================================================ */
.form-control.is-invalid {
    border-color: var(--color-error);
}

.form-control.is-valid {
    border-color: var(--color-success);
}

.invalid-feedback {
    display: none;
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: var(--spacing-xs);
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}