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

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --text-heading: #1e293b;
    --text-body: #475569;
    --text-light: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.brand-logo img {
    width: 36px;
    height: 36px;
}

.brand-text {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-heading);
}

/* Main Content & Checker Form */
.main-content {
    padding: 4rem 0 3rem;
    text-align: center;
}

.checker-header {
    margin-bottom: 2.5rem;
}

.checker-title {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 0.5rem;
}

.checker-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 500px;
    margin: 0 auto;
}

.checker-form-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.checker-form .form-group {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 0.5rem;
}

.form-icon {
    position: absolute;
    left: 1.5rem;
    color: var(--text-light);
    font-size: 1.125rem;
}

.form-input {
    flex: 1;
    border: none;
    outline: none;
    background: none;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1rem;
    width: 100%;
    color: var(--text-body);
}

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

.check-button {
    background-color: var(--primary-color);
    color: var(--bg-white);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.check-button:hover {
    background-color: var(--primary-hover);
}

.check-button:disabled {
    background-color: #9ca3af;
    cursor: not-allowed;
}

/* Loading and Error States */
.loading, .error-message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    display: none; /* Hidden by default */
}

.loading {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--text-body);
}

.loading.show {
    display: flex;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.error-message {
    background-color: #fee2e2;
    color: #b91c1c;
    font-weight: 500;
}

.error-message.show {
    display: block;
}


/* Results Section */
.results-section {
    padding: 3rem 0;
    background-color: var(--bg-white);
    border-top: 1px solid var(--border-color);
}

.results-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.results-header h2 {
    font-size: 1.75rem;
    color: var(--text-heading);
}

.results-header h2 span {
    font-weight: 700;
    color: var(--primary-color);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.metric-card {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
}

.metric-card.good { border-left: 4px solid #10b981; }
.metric-card.warning { border-left: 4px solid #f59e0b; }
.metric-card.error { border-left: 4px solid #ef4444; }

.metric-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 0.25rem;
}

.metric-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-light);
}

.results-details .detail-category {
    margin-bottom: 2.5rem;
}

.results-details h3 {
    font-size: 1.5rem;
    color: var(--text-heading);
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.detail-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.detail-icon {
    font-size: 1.5rem;
    margin-top: 0.25rem;
}
.detail-icon.success { color: #10b981; }
.detail-icon.warning { color: #f59e0b; }
.detail-icon.error { color: #ef4444; }
.detail-icon.info { color: #3b82f6; }

.detail-content {
    flex: 1;
}

.detail-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 0.25rem;
}

.detail-description {
    font-size: 0.95rem;
    color: var(--text-body);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .checker-title {
        font-size: 2.25rem;
    }
    .checker-form .form-group {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    .form-input {
        text-align: center;
        padding: 0.75rem;
    }
    .form-icon {
        display: none;
    }
    .check-button {
        width: 100%;
    }
}