/* ========================================
   CSS Variables & Design Tokens - Interfy Theme
   ======================================== */
:root {
    /* Interfy Brand Colors */
    --color-primary: #3506e6;
    --color-primary-dark: #2a05b8;
    --color-secondary: #8810e1;
    --color-accent: #a855f7;

    /* Gradient - Main Brand */
    --gradient-primary: linear-gradient(135deg, #3506e6 0%, #8810e1 100%);
    --gradient-header: linear-gradient(to right, #3506e6, #8810e1);

    /* Light Mode (Default) */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-card: #ffffff;
    --color-bg-input: #f1f3f5;
    --color-bg-input-focus: #e9ecef;

    --color-text-primary: #212529;
    --color-text-secondary: #6c757d;
    --color-text-muted: #adb5bd;

    --color-border: #dee2e6;
    --color-border-focus: #3506e6;

    /* Status Colors */
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-warning: #f59e0b;

    /* Shadows - Light Mode */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 30px rgba(53, 6, 230, 0.3);

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

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

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Dark Mode - Auto Detection
   ======================================== */
@media (prefers-color-scheme: dark) {
    :root {
        /* Dark Mode Colors */
        --color-bg-primary: #0f0f1e;
        --color-bg-secondary: #1a1a2e;
        --color-bg-card: rgba(26, 26, 46, 0.8);
        --color-bg-input: rgba(255, 255, 255, 0.05);
        --color-bg-input-focus: rgba(255, 255, 255, 0.08);

        --color-text-primary: #ffffff;
        --color-text-secondary: #a0aec0;
        --color-text-muted: #718096;

        --color-border: rgba(255, 255, 255, 0.1);
        --color-border-focus: rgba(53, 6, 230, 0.5);

        /* Shadows - Dark Mode */
        --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
        --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
        --shadow-glow: 0 0 30px rgba(136, 16, 225, 0.4);
    }
}

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

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

body {
    font-family: var(--font-family);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ========================================
   Background Animation - Gradient Orbs
   ======================================== */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

@media (prefers-color-scheme: dark) {
    .gradient-orb {
        opacity: 0.4;
    }
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-secondary) 0%, transparent 70%);
    bottom: -10%;
    right: -10%;
    animation-delay: 7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -30px) scale(1.1);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* ========================================
   Header
   ======================================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: var(--gradient-header);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.6s ease-out;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
}

.security-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: white;
    backdrop-filter: blur(10px);
}

/* User Menu (for authenticated pages) */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: white;
    font-size: var(--font-size-sm);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.logout-button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.5);
    color: white;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.logout-button:hover {
    background: var(--color-error);
    border-color: var(--color-error);
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out;
}

/* ========================================
   Cards
   ======================================== */
.order-summary-card,
.payment-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.order-summary-card {
    height: fit-content;
    position: sticky;
    top: var(--spacing-xl);
}

.order-summary-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Order Items
   ======================================== */
.order-items {
    margin-bottom: var(--spacing-lg);
}

.order-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: background var(--transition-fast);
}

.order-item:hover {
    background: var(--color-bg-input-focus);
}

.item-info {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.item-image {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background: var(--gradient-primary);
}

.item-details h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.item-details p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.item-price {
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Order Total
   ======================================== */
.order-total {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-lg);
}

.total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.total-final {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.total-final span:last-child {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Form Styles
   ======================================== */
.payment-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.card-type {
    font-size: var(--font-size-xs);
    padding: 0.25rem 0.5rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tooltip {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: help;
    color: var(--color-text-muted);
}

.tooltip-text {
    position: absolute;
    bottom: 100%;
    right: 0;
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    box-shadow: var(--shadow-md);
    margin-bottom: 0.5rem;
    border: 1px solid var(--color-border);
}

.tooltip:hover .tooltip-text {
    opacity: 1;
    visibility: visible;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--color-text-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3rem;
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: all var(--transition-base);
    outline: none;
}

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

.form-input:focus {
    background: var(--color-bg-input-focus);
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 4px rgba(53, 6, 230, 0.1);
}

.form-input:focus+.validation-icon,
.form-input:focus~.input-icon {
    color: var(--color-primary);
}

.validation-icon {
    position: absolute;
    right: var(--spacing-md);
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.validation-icon.valid {
    opacity: 1;
    color: var(--color-success);
}

.validation-icon.invalid {
    opacity: 1;
    color: var(--color-error);
}

.validation-icon.valid::before {
    content: '✓';
    font-weight: bold;
}

.validation-icon.invalid::before {
    content: '✕';
    font-weight: bold;
}

.error-message {
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: 0.25rem;
    opacity: 0;
    height: 0;
    overflow: hidden;
    transition: opacity var(--transition-fast), height var(--transition-fast);
}

.error-message.show {
    opacity: 1;
    height: auto;
}

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

/* ========================================
   Submit Button
   ======================================== */
.submit-button {
    position: relative;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 700;
    font-family: var(--font-family);
    cursor: pointer;
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.submit-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.submit-button:active {
    transform: translateY(0);
}

.submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.button-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: opacity var(--transition-fast);
}

.submit-button.loading .button-text {
    opacity: 0;
}

.button-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.submit-button.loading .button-loader {
    opacity: 1;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* ========================================
   Security Info & Powered By
   ======================================== */
.security-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
    justify-content: center;
}

.powered-by {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.powered-by img {
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.powered-by:hover img {
    opacity: 1;
}

/* ========================================
   Modal
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 500px;
    width: 90%;
    text-align: center;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal.show .modal-content {
    transform: scale(1);
    animation: modalBounce 0.5s ease-out;
}

@keyframes modalBounce {
    0% {
        transform: scale(0.8);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

.success-icon,
.error-icon {
    margin: 0 auto var(--spacing-lg);
    animation: iconPop 0.6s ease-out 0.2s both;
}

@keyframes iconPop {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-content h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.modal-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.transaction-details {
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.transaction-details p {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.transaction-details p:last-child {
    margin-bottom: 0;
}

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

.modal-button {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
}

.modal-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* ========================================
   Animations
   ======================================== */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .order-summary-card {
        position: static;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-md);
    }

    .section-title {
        font-size: var(--font-size-lg);
    }
}