:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #0d6efd;
    --accent-hover: #0b5ed7;
    --success-color: #198754;
    --error-color: #dc3545;
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #0f3460;
    --text-primary: #eef2f7;
    --text-secondary: #a8b2c1;
    --border-color: #2d3e5f;
    --accent-color: #00b4d8;
    --accent-hover: #0096c7;
    --success-color: #00c896;
    --error-color: #ff6b6b;
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    background: var(--bg-card);
    padding: 1.5rem 0;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 2rem;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    transform: scale(1.05);
    border-color: var(--accent-color);
}

/* Main Card */
.main-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    animation: fadeInUp 0.5s ease;
}

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

.card-title {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

/* Form */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: 'Courier New', monospace;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.1);
}

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

/* Button */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* Alert */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: none;
    animation: slideDown 0.3s ease;
}

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

.alert.show {
    display: block;
}

.alert-success {
    background: rgba(25, 135, 84, 0.1);
    border: 2px solid var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background: rgba(220, 53, 69, 0.1);
    border: 2px solid var(--error-color);
    color: var(--error-color);
}

/* Result Card */
.result-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 2rem;
    margin-top: 2rem;
    display: none;
    animation: fadeInUp 0.5s ease;
    box-shadow: var(--shadow);
}

.result-card.show {
    display: block;
}

.success-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.success-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.5rem;
    animation: scaleIn 0.5s ease;
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.result-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
}

/* Step Cards */
.step-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.step-card:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-sm);
}

.step-number {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.step-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* URL Input */
.url-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.url-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Buttons */
.copy-btn {
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn.primary {
    background: var(--accent-color);
    color: white;
    width: 100%;
    justify-content: center;
}

.copy-btn.primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.copy-btn.secondary {
    background: var(--bg-card);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
}

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

.copy-btn.small {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.copy-btn.copied {
    background: var(--success-color) !important;
    color: white !important;
    border-color: var(--success-color) !important;
}

/* Configs Header */
.configs-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 1rem;
}

.badge {
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: bold;
    display: inline-block;
}

/* Config List */
.config-list {
    max-height: 500px;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.config-item {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.config-item:hover {
    border-color: var(--accent-color);
    transform: translateX(-5px);
    box-shadow: var(--shadow-sm);
}

.config-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    gap: 1rem;
}

.config-site {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
}

.site-icon {
    font-size: 1.2rem;
}

.site-name {
    font-weight: bold;
    color: var(--accent-color);
}

.config-number {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.15rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.config-content {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    word-break: break-all;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 0.75rem;
    border-radius: 6px;
    line-height: 1.4;
}

/* Expiry Card */
.expiry-card {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 152, 0, 0.1));
    border: 2px solid #ffc107;
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.warning-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.expiry-content {
    flex: 1;
}

.expiry-title {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.expiry-text {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.expiry-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

.expiry-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

/* Loading Spinner */
.loading {
    display: none;
    justify-content: center;
    align-items: center;
    margin: 1rem 0;
}

.loading.show {
    display: flex;
}

.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Timer */
.timer {
    display: none;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 1rem;
    animation: pulse 2s ease-in-out infinite;
}

.timer.show {
    display: block;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Info Section */
.info-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    margin-top: 2rem;
}

.info-title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-list {
    list-style: none;
}

.info-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-list li:last-child {
    border-bottom: none;
}

.info-list li::before {
    content: "✓";
    color: var(--success-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    margin-top: 4rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header-content {
        padding: 0 1rem;
    }
    
    .main-card {
        padding: 1.5rem;
    }
    
    .card-title {
        font-size: 1.5rem;
    }
    
    .result-card {
        padding: 1.5rem;
    }
    
    .step-card {
        flex-direction: column;
        gap: 1rem;
    }
    
    .configs-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .copy-btn.secondary {
        width: 100%;
        justify-content: center;
    }
    
    .config-item:hover {
        transform: translateX(-2px);
    }
    
    .expiry-card {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .card-title {
        font-size: 1.25rem;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .main-card {
        padding: 1rem;
    }
    
    .result-card {
        padding: 1rem;
    }
    
    .step-card {
        padding: 1rem;
    }
    
    .step-title {
        font-size: 1rem;
    }
    
    .config-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .copy-btn.small {
        width: 100%;
        justify-content: center;
    }
}
    
    .btn {
        padding: 0.875rem 1.5rem;
    }
}