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

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===========================
   Utility Classes
   =========================== */
.hidden {
    display: none !important;
}

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

.text-muted {
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

/* ===========================
   Loading Overlay
   =========================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-overlay p {
    color: white;
    margin-top: 1rem;
    font-size: 1.125rem;
}

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

/* ===========================
   Navigation
   =========================== */
.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-color);
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
}

/* ===========================
   Auth Container
   =========================== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 3rem;
    width: 100%;
    max-width: 450px;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.auth-form h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* ===========================
   Forms
   =========================== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group input:disabled {
    background: var(--bg-color);
    cursor: not-allowed;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #475569;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===========================
   App Container
   =========================== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

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

.page-header {
    margin-bottom: 2rem;
}

.page-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* ===========================
   Cards
   =========================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.card-body {
    padding: 1.5rem;
}

/* ===========================
   Credits Card
   =========================== */
.credits-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
}

.credits-card .card-header,
.credits-card .card-body {
    border-color: rgba(255, 255, 255, 0.2);
}

.credits-card h3 {
    color: white;
}

.credits-display {
    margin-bottom: 1.5rem;
}

.credits-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.credits-total {
    font-size: 2rem;
    opacity: 0.7;
}

.credits-bar {
    background: rgba(255, 255, 255, 0.2);
    height: 12px;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.credits-progress {
    background: white;
    height: 100%;
    transition: width 0.5s ease;
    border-radius: 6px;
}

.credits-info {
    opacity: 0.9;
    font-size: 1rem;
}

.credits-actions {
    display: flex;
    gap: 1rem;
}

.credits-actions .btn-primary {
    background: white;
    color: var(--primary-color);
}

/* ===========================
   Stats Grid
   =========================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.2s;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 2.5rem;
    background: rgba(79, 70, 229, 0.1);
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
}

.stat-info h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* ===========================
   API Token Display
   =========================== */
.token-display {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
}

.token-display input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

/* ===========================
   Quick Start Grid
   =========================== */
.quick-start-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.quick-start-item {
    padding: 1.5rem;
    background: var(--bg-color);
    border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

.quick-start-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.quick-start-item p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===========================
   Tools Grid
   =========================== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    transition: all 0.2s;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.tool-header h3 {
    font-size: 1.25rem;
}

.tool-cost {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.tool-cost.free {
    background: var(--success-color);
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}

.tool-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.tool-form input,
.tool-form select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.tool-form input:focus,
.tool-form select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* ===========================
   Results Display
   =========================== */
#toolResults pre {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    max-height: 600px;
    overflow-y: auto;
}

/* ===========================
   Profile & Subscription
   =========================== */
.subscription-info {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.subscription-info p {
    margin-bottom: 0.75rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

/* ===========================
   Toast Notifications
   =========================== */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.5rem;
    min-width: 300px;
    border-left: 4px solid var(--primary-color);
    animation: slideIn 0.3s ease-out;
}

.toast.success { border-left-color: var(--success-color); }
.toast.error { border-left-color: var(--danger-color); }
.toast.warning { border-left-color: var(--warning-color); }

.toast-message {
    font-weight: 500;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .app-container {
        padding: 1rem;
    }

    .page-header h2 {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .credits-number {
        font-size: 2rem;
    }

    .auth-card {
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .token-display {
        flex-direction: column;
    }

    .credits-actions {
        flex-direction: column;
    }
}

/* ===========================
   Modal Styles
   =========================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 1rem;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-content h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
}

.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.plan-option {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all 0.2s;
    cursor: pointer;
    background: var(--bg-card);
}

.plan-option:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.plan-option h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.plan-price {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.plan-credits {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.plan-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.plan-features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.plan-features li::before {
    content: '✓ ';
    color: var(--success-color);
    font-weight: bold;
    margin-right: 0.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* ===========================
   Coupon Styles
   =========================== */
.coupons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.coupon-item {
    background: white;
    border: 2px dashed var(--primary-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.coupon-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-dark);
    background: #f0f0ff;
}

.coupon-code {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.coupon-discount {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

.coupon-description {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

/* ===========================
   Dark Mode Support (Future)
   =========================== */
@media (prefers-color-scheme: dark) {
    /* Add dark mode styles here */
}