/**
 * Payment Gateway - Premium Stylesheet
 * Professional Dark Theme with Advanced Glassmorphism
 */

/* ============================================
   CSS Variables (Premium Design Tokens)
   ============================================ */
:root {
    /* Premium Color Palette */
    --color-black: #000000;
    --color-black-950: #050505;
    --color-black-900: #0a0a0a;
    --color-black-850: #0f0f0f;
    --color-black-800: #141414;
    --color-black-750: #191919;
    --color-black-700: #1a1a1a;
    --color-black-600: #242424;
    --color-black-500: #2d2d2d;
    --color-black-400: #3a3a3a;
    
    /* Premium Accent Colors with Gradients */
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-primary-glow: rgba(99, 102, 241, 0.4);
    
    --color-success: #10b981;
    --color-success-glow: rgba(16, 185, 129, 0.3);
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-error-glow: rgba(239, 68, 68, 0.3);
    --color-info: #3b82f6;
    
    /* Advanced Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-bg-hover: rgba(255, 255, 255, 0.1);
    --glass-bg-active: rgba(255, 255, 255, 0.14);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-border-hover: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --glass-shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.5);
    --glass-blur: 24px;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #e5e7eb;
    --text-tertiary: #9ca3af;
    --text-quaternary: #6b7280;
    --text-disabled: #4b5563;
    
    /* Background Gradients */
    --bg-primary: #000000;
    --bg-secondary: linear-gradient(135deg, #0a0a0a 0%, #141414 100%);
    --bg-elevated: linear-gradient(135deg, #1a1a1a 0%, #242424 100%);
    --bg-overlay: rgba(0, 0, 0, 0.85);
    
    /* Premium Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    /* Enhanced Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Premium Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    --radius-3xl: 36px;
    --radius-full: 9999px;
    
    /* Premium Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 32px var(--color-primary-glow);
    --shadow-glow-success: 0 0 32px var(--color-success-glow);
    
    /* Premium Animations */
    --duration-instant: 100ms;
    --duration-fast: 200ms;
    --duration-normal: 350ms;
    --duration-slow: 600ms;
    --duration-slower: 900ms;
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.01) 2px,
            rgba(255, 255, 255, 0.01) 4px
        );
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   Premium Glassmorphism Components
   ============================================ */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    box-shadow: 
        var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all var(--duration-normal) var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    opacity: 0;
    transition: opacity var(--duration-normal);
}

.glass-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: 
        var(--glass-shadow-hover),
        inset 0 1px 0 rgba(255, 255, 255, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.05);
}

.glass-card:hover::before {
    opacity: 1;
}

.glass-card:active {
    transform: translateY(-2px);
    background: var(--glass-bg-active);
}

/* Premium Input Styles */
.glass-input {
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1.5px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    padding: 16px 20px;
    font-size: 1rem;
    font-family: var(--font-primary);
    width: 100%;
    transition: all var(--duration-fast) var(--ease-smooth);
    position: relative;
}

.glass-input::placeholder {
    color: var(--text-quaternary);
    font-weight: 400;
}

.glass-input:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 
        0 0 0 4px rgba(99, 102, 241, 0.15),
        0 8px 24px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.glass-input:valid:not(:placeholder-shown) {
    border-color: var(--color-success);
}

.glass-input:invalid:not(:placeholder-shown):not(:focus) {
    border-color: var(--color-error);
}

/* Premium Button Styles */
.glass-button {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(139, 92, 246, 0.2) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1.5px solid rgba(99, 102, 241, 0.4);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    padding: 16px 32px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-out-expo);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-align: center;
    letter-spacing: 0.3px;
}

.glass-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.15),
        transparent
    );
    transition: left var(--duration-slow);
}

.glass-button:hover::before {
    left: 100%;
}

.glass-button:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.35) 0%, rgba(139, 92, 246, 0.3) 100%);
    border-color: rgba(99, 102, 241, 0.6);
    transform: translateY(-2px);
    box-shadow: 
        0 12px 32px rgba(99, 102, 241, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.1);
}

.glass-button:active {
    transform: translateY(0);
    box-shadow: 
        0 4px 16px rgba(99, 102, 241, 0.2),
        inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.glass-button.primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-color: var(--color-primary-light);
    box-shadow: 
        0 8px 24px rgba(99, 102, 241, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.glass-button.primary:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    box-shadow: 
        0 12px 32px rgba(99, 102, 241, 0.5),
        var(--shadow-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.glass-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ============================================
   Layout Components
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.header {
    background: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-6) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    transition: all var(--duration-fast);
}

.logo:hover {
    filter: brightness(1.2);
}

.main-content {
    padding: var(--space-12) 0;
    min-height: calc(100vh - 200px);
    position: relative;
    z-index: 1;
}

/* ============================================
   Premium Payment Form Styles
   ============================================ */
.payment-container {
    max-width: 520px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.payment-form {
    padding: var(--space-10) var(--space-8);
    position: relative;
}

.payment-form::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    pointer-events: none;
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.form-header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.form-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.form-header p {
    color: var(--text-tertiary);
    font-size: 0.95rem;
}

.form-section {
    margin-bottom: var(--space-8);
}

.form-section-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--glass-border);
}

.form-group {
    margin-bottom: var(--space-6);
    position: relative;
}

.form-label {
    display: block;
    margin-bottom: var(--space-3);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.3px;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

/* Premium Payment Method Selection */
.payment-methods {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.payment-method-btn {
    padding: var(--space-5) var(--space-4);
    background: rgba(255, 255, 255, 0.04);
    border: 1.5px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-smooth);
    text-align: center;
    font-weight: 500;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.payment-method-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.15) 100%);
    opacity: 0;
    transition: opacity var(--duration-fast);
}

.payment-method-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.2);
}

.payment-method-btn.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(139, 92, 246, 0.2) 100%);
    border-color: var(--color-primary);
    box-shadow: 
        0 4px 16px rgba(99, 102, 241, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.payment-method-btn.active::before {
    opacity: 1;
}

/* Premium Submit Button */
.submit-button {
    width: 100%;
    margin-top: var(--space-8);
    padding: 18px 32px;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    position: relative;
}

.submit-button::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--duration-fast);
}

.submit-button:hover::after {
    opacity: 1;
}

/* Premium Message Styles */
.message {
    padding: var(--space-5) var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    border: 1.5px solid;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 500;
    animation: slideDown var(--duration-normal) var(--ease-out-expo);
}

.message.success {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
    color: var(--color-success);
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.2);
}

.message.error {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
    color: var(--color-error);
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.2);
}

/* Premium Error Messages */
.error-message {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: var(--space-2);
    font-size: 0.875rem;
    color: var(--color-error);
    font-weight: 500;
    animation: slideDown var(--duration-fast);
}

.error-message::before {
    content: '⚠';
    font-size: 1rem;
}

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

/* Premium Loading Spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

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

/* Premium Animations */
.fade-in {
    animation: fadeIn var(--duration-slow) var(--ease-out-expo);
}

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

/* ============================================
   Dashboard Premium Styles
   ============================================ */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

.stat-card {
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    opacity: 0;
    transition: opacity var(--duration-normal);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card h3 {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card .change {
    font-size: 0.875rem;
    color: var(--color-success);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
}

.transactions-section {
    margin-top: var(--space-10);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.transaction-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.transaction-item {
    padding: var(--space-6) var(--space-6);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: var(--space-6);
    align-items: center;
    transition: all var(--duration-fast);
}

.transaction-item:hover {
    transform: translateX(6px);
    background: var(--glass-bg-hover);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.4);
    box-shadow: 0 0 16px rgba(16, 185, 129, 0.2);
}

.status-badge.pending {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.4);
    box-shadow: 0 0 16px rgba(245, 158, 11, 0.2);
}

.status-badge.failed {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-error);
    border: 1px solid rgba(239, 68, 68, 0.4);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.2);
}

.status-badge.processing {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-info);
    border: 1px solid rgba(59, 130, 246, 0.4);
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.2);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .payment-container {
        padding: 0 var(--space-4);
    }
    
    .payment-form {
        padding: var(--space-8) var(--space-6);
    }
    
    .form-header h1 {
        font-size: 1.75rem;
    }
    
    .transaction-item {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .payment-methods {
        grid-template-columns: 1fr;
    }
    
    .glass-card {
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: var(--space-4);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.hidden {
    display: none;
}

/* Premium Focus States */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}