/* ============================================
   K Visa Site - Modern UI Design System
   Created: 2025-11-10
   ============================================ */

/* === COLOR SYSTEM === */
:root {
    /* Primary Colors - Purple Gradient */
    --primary-start: #667eea;
    --primary-end: #764ba2;
    --primary-light: #a78bfa;
    --primary-dark: #5b21b6;

    /* Accent Colors - Teal/Green */
    --accent-start: #06b6d4;
    --accent-end: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Neutral Colors */
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
}

/* === GLOBAL RESETS === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === ANIMATIONS === */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse-glow {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
    }
    50% {
        opacity: 0.9;
        transform: scale(1.05);
        box-shadow: 0 0 40px rgba(102, 126, 234, 0.6);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

/* === UTILITY CLASSES === */
.float-animation {
    animation: float 4s ease-in-out infinite;
}

.pulse-glow {
    animation: pulse-glow 3s ease-in-out infinite;
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

.gradient-bg {
    background: linear-gradient(135deg, var(--primary-start) 0%, var(--primary-end) 100%);
}

.gradient-bg-animated {
    background: linear-gradient(-45deg, var(--primary-start), var(--primary-end), var(--accent-start), var(--accent-end));
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-start) 0%, var(--primary-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text-accent {
    background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === GLASSMORPHISM CARDS === */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-2xl);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px 0 rgba(31, 38, 135, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

/* === MODERN CARDS === */
.modern-card {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.modern-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-start), var(--primary-end));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.modern-card:hover::before {
    transform: scaleX(1);
}

.modern-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-light);
}

/* === PREMIUM BUTTONS === */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-start) 0%, var(--primary-end) 100%);
    color: white;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: white;
    color: var(--primary-start);
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid var(--primary-start);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--primary-start);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* === BADGES === */
.badge {
    padding: 0.375rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.badge-confirmed {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
    animation: pulse-glow 2s infinite;
}

.badge-tbd {
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
}

.badge-info {
    background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    color: white;
}

/* === HERO SECTION === */
.hero-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    position: relative;
    overflow: hidden;
}

.hero-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.4;
}

/* === FEATURE ICONS === */
.feature-icon {
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-start), var(--primary-end));
    color: white;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
    margin-bottom: var(--space-lg);
    transition: all 0.3s ease;
}

.feature-icon:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.5);
}

/* === HEADER === */
.sticky-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 768px) {
    .modern-card {
        padding: var(--space-lg);
    }

    .btn-primary, .btn-secondary {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    .feature-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.5rem;
    }
}

/* === COMPARISON TABLE === */
.comparison-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.comparison-table th {
    background: linear-gradient(135deg, var(--primary-start), var(--primary-end));
    color: white;
    padding: var(--space-lg);
    text-align: left;
    font-weight: 600;
}

.comparison-table td {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.comparison-table tr:hover td {
    background-color: #f9fafb;
}

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

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-start), var(--primary-end));
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* === LOADING SHIMMER === */
.shimmer {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 2000px 100%;
    animation: shimmer 2s infinite;
}

/* === TOOLTIP === */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: 0.5rem 1rem;
    background: var(--text-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}