/* =================== CSS VARIABLES =================== */
:root {
    --color-primary: #007bcc;
    --color-primary-dark: #0056b3;
    --color-secondary: #28a745;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #007bcc;
    
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

/* =================== BASE STYLES =================== */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: white;
    color: var(--color-gray-900);
    margin: 0;
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.025em;
}

p {
    line-height: 1.7;
    color: var(--color-gray-600);
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-gray-100);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--color-gray-800);
}

/* =================== HEADER STYLES =================== */
.app-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

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

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

.logo-image {
    height: 50px;
    width: auto;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.header-logo .logo-text h1 {
    font-size: 1.5rem;
    margin: 0;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-logo .logo-text p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-gray-500);
    font-weight: 500;
}

/* =================== NAVIGATION STYLES =================== */
.header-nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-btn {
    background: transparent;
    border: 2px solid var(--color-gray-200);
    color: var(--color-gray-700);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

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

/* =================== MAIN HEADER STYLES =================== */
.main-header {
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    background: var(--color-primary);
    color: white;
    position: relative;
    overflow: hidden;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.5s ease;
}

.main-header.grade-a {
    background: linear-gradient(135deg, var(--color-success) 0%, #1e7e34 100%);
}

.main-header.grade-f {
    background: linear-gradient(135deg, var(--color-danger) 0%, #bd2130 100%);
}

.main-header.grade-b,
.main-header.grade-c,
.main-header.grade-d {
    background: linear-gradient(135deg, var(--color-warning) 0%, #e0a800 100%);
}

.main-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin: 0 0 var(--spacing-lg) 0;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-emphasis {
    color: white;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.3);
}

.hero-highlight {
    background: linear-gradient(135deg, #ffffff, #e3f2fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0 0 var(--spacing-2xl) 0;
    font-weight: 400;
    line-height: 1.6;
}

/* =================== FORM STYLES =================== */
#scan-form {
    margin: 0;
}

.input-group {
    display: flex;
    gap: var(--spacing-md);
    max-width: 700px;
    margin: 0 auto;
    flex-wrap: wrap;
    align-items: stretch;
}

#url-input {
    flex: 1;
    min-width: 500px;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
    font-size: 1.1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    transition: all 0.3s ease;
    font-family: var(--font-sans);
    font-weight: 500;
}

#url-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

#url-input:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

#scan-button {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: rgba(220, 53, 69, 0.9);
    color: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font-sans);
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.25);
    position: relative;
    overflow: hidden;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transform: perspective(1px) translateZ(0);
    flex-shrink: 0;
}

#scan-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 0.6s ease;
}

#scan-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(220, 53, 69, 0.35);
    background: rgba(220, 53, 69, 1);
    color: white;
}

#scan-button:hover::before {
    left: 100%;
}

.button-text {
    font-weight: 700;
    letter-spacing: 0.01em;
    font-size: 1rem;
}

.button-icon {
    font-size: 1em;
    opacity: 0.8;
}

/* =================== LAYOUT STYLES =================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: white;
    min-height: 100vh;
    position: relative;
}

#loading {
    text-align: center;
    padding: var(--spacing-2xl);
    font-size: 1.2rem;
    display: none;
    color: var(--color-gray-600);
}

#scan-results {
    display: none;
}

#validation-error-container {
    margin-bottom: var(--spacing-xl);
}

/* =================== INTRO CONTENT STYLES =================== */
.intro-hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-gray-900);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    margin: 0;
    font-weight: 400;
}

/* =================== FEATURE GRID =================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--color-gray-100);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    display: block;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-gray-900);
}

.feature-description {
    color: var(--color-gray-600);
    line-height: 1.6;
    margin: 0;
}

/* =================== MODERN CARD STYLES =================== */
.modern-card {
    background: white;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
}

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

.modern-card .card-header {
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
    border-bottom: 1px solid var(--color-gray-200);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

.modern-card .card-header h3 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.modern-card .card-body {
    padding: var(--spacing-xl);
}

/* =================== STEPS CONTAINER =================== */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    padding: var(--spacing-lg);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    border: 1px solid var(--color-gray-200);
}

.step:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: white;
}

.step-number {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
}

.step-content h4 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--color-gray-900);
    font-weight: 600;
    font-size: 1.1rem;
}

.step-content p {
    margin: 0;
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* =================== SECURITY FEATURES =================== */
.security-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.security-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.security-feature:hover {
    background: var(--color-gray-100);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.feature-badge {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
    flex-shrink: 0;
}

.security-feature span {
    font-weight: 500;
    color: var(--color-gray-700);
}

/* =================== SECURITY HEADERS TABLE =================== */
.security-headers-table-container {
    overflow-x: auto;
    margin-top: var(--spacing-md);
}

.security-headers-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background: white;
}

.security-headers-table thead {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
}

.security-headers-table th {
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.025em;
    text-transform: uppercase;
}

.security-headers-table td {
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
    vertical-align: middle;
}

.security-headers-table tbody tr:hover {
    background: var(--color-gray-50);
}

.security-headers-table tbody tr:last-child td {
    border-bottom: none;
}

.header-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: white;
    margin-right: var(--spacing-sm);
    min-width: 85px;
    text-align: center;
}

.header-badge.csp { background: #8b5cf6; }
.header-badge.hsts { background: #06b6d4; }
.header-badge.xframe { background: #f59e0b; }
.header-badge.xss { background: #ef4444; }
.header-badge.nosniff { background: #10b981; }
.header-badge.referrer { background: #6366f1; }

.header-name {
    font-weight: 600;
    color: var(--color-gray-900);
    font-size: 0.875rem;
}

.protection-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    min-width: 85px;
    text-align: center;
}

.protection-badge.high {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.protection-badge.medium {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.protection-badge.low {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* =================== LEGACY CARD STYLES =================== */
.card {
    background: white;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

.card-body {
    padding: var(--spacing-xl);
}

.card-body ol {
    padding-left: var(--spacing-lg);
    margin: 0;
}

.card-body h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    font-weight: 600;
}

.card-body ul {
    list-style: disc;
    padding-left: var(--spacing-xl);
    margin: var(--spacing-md) 0;
}

.card-body li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-600);
}

/* =================== SUMMARY STYLES =================== */
.summary-grid {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.summary-grade {
    font-size: 5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    height: 150px;
    background: white;
    box-shadow: var(--shadow-lg);
}

.summary-grade.grade-a {
    color: var(--color-success);
    border: 4px solid var(--color-success);
}

.summary-grade.grade-f {
    color: var(--color-danger);
    border: 4px solid var(--color-danger);
}

.summary-grade.grade-b,
.summary-grade.grade-c,
.summary-grade.grade-d {
    color: var(--color-warning);
    border: 4px solid var(--color-warning);
}

.summary-details ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.summary-details li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-600);
}

.summary-details li strong {
    min-width: 120px;
    display: inline-block;
    color: var(--color-gray-900);
    font-weight: 600;
}

/* =================== BADGE & PILL STYLES =================== */
.badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: var(--spacing-sm);
    display: inline-block;
    font-family: var(--font-mono);
    letter-spacing: 0.025em;
    text-transform: uppercase;
}

.badge-present {
    background: var(--color-success);
    color: white;
}

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

.badge-info {
    background: var(--color-info);
    color: white;
}

.badge-warning {
    background: var(--color-warning);
    color: white;
}

/* =================== RESPONSIVE DESIGN =================== */
@media (max-width: 768px) {
    .main-header {
        padding: var(--spacing-xl) var(--spacing-md);
        min-height: 50vh;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .input-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    #url-input {
        min-width: unset;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        gap: var(--spacing-lg);
    }
    
    .step {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .step-number {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
        flex-shrink: 0;
    }
    
    .step-content h4 {
        font-size: 1rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .step-content p {
        font-size: 0.9rem;
    }
    
    .security-features {
        grid-template-columns: 1fr;
    }
    
    .summary-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .app-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-card,
    .modern-card .card-body,
    .card-body {
        padding: var(--spacing-lg);
    }
    
    .step {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
    }
    
    .step-number {
        width: 3rem;
        height: 3rem;
        font-size: 1.1rem;
        align-self: center;
    }
    
    .step-content {
        text-align: center;
    }
    
    .step-content h4 {
        font-size: 1.1rem;
    }
    
    .step-content p {
        font-size: 0.95rem;
    }
}

/* =================== ADDITIONAL LEGACY STYLES =================== */
.badge-missing {
    background: var(--color-danger);
    color: white;
}

.header-pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm); 
    margin-top: var(--spacing-md);
}

.pill {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-mono);
    letter-spacing: 0.025em;
}

.pill.pill-present {
    background: var(--color-success);
    color: white;
}

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

.pill svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.header-pills-section {
    margin-top: var(--spacing-lg);
}

.header-pills-section strong {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
    font-weight: 600;
}

/* =================== RECOMMENDATION STYLES =================== */
.recommendation {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--color-gray-50);
    border-left: 4px solid var(--color-gray-300);
    transition: all 0.3s ease;
}

.recommendation:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    background: white;
}

.text-success {
    border-left-color: var(--color-success) !important;
    background: #d4edda !important;
    color: #155724;
}

.text-warning {
    border-left-color: var(--color-warning) !important;
    background: #fff3cd !important;
    color: #856404;
}

.text-danger {
    border-left-color: var(--color-danger) !important;
    background: #f8d7da !important;
    color: #721c24;
}

.text-muted {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

/* =================== HEADER LIST STYLES =================== */
.header-list-item {
    padding: var(--spacing-lg) var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
    transition: all 0.3s ease;
    border-radius: var(--radius-md);
    margin: 0 calc(-1 * var(--spacing-lg));
    background: transparent;
}

.header-list-item:last-child {
    border-bottom: none;
}

.header-list-item:hover {
    background: var(--color-gray-50);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    border-color: var(--color-gray-300);
}

.header-list-item .header-name {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 1.1rem;
    font-family: var(--font-mono);
}

.header-list-item p {
    margin: var(--spacing-xs) 0 0 0;
    color: var(--color-gray-600);
}

.header-list-item .header-value {
    word-break: break-all;
    font-family: var(--font-mono);
    background: var(--color-gray-100);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--color-gray-800);
    border: 1px solid var(--color-gray-200);
}

/* =================== RAW HEADERS TABLE STYLES =================== */
.raw-headers-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.raw-headers-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
    vertical-align: top;
    background: white;
}

.raw-headers-table td:first-child {
    font-weight: 600;
    color: var(--color-primary);
    width: 200px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--color-gray-50);
}

.raw-headers-table td:last-child {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    word-break: break-all;
    color: var(--color-gray-700);
}

.raw-headers-table tr:last-child td {
    border-bottom: none;
}

.raw-headers-table tr:hover td {
    background: var(--color-gray-50);
}

.raw-headers-table tr:hover td:first-child {
    background: var(--color-gray-100);
}

.security-header {
    color: var(--color-success) !important;
    font-weight: 700;
}

/* =================== INFO ITEM STYLES =================== */
.info-item {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
    transition: all 0.3s ease;
    border-radius: var(--radius-md);
    background: transparent;
}

.info-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.info-item:hover {
    background: var(--color-gray-50);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    border-color: var(--color-gray-300);
}

.info-item h5 {
    color: var(--color-primary);
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.info-item p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--color-gray-600);
}

.info-item a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.info-item a:hover {
    text-decoration: underline;
    color: var(--color-primary-dark);
}

/* =================== ANIMATIONS =================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.card {
    animation: fadeIn 0.6s ease-out;
}

.feature-card {
    animation: fadeIn 0.6s ease-out;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }

/* =================== ENHANCED RESPONSIVE DESIGN =================== */
@media (max-width: 1024px) {
    .container {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .main-header {
        padding: var(--spacing-xl) var(--spacing-md);
        min-height: 50vh;
    }
    
    .input-group {
        flex-direction: column;
        gap: var(--spacing-lg);
        max-width: 500px;
    }
    
    #url-input {
        width: 100%;
        min-width: unset;
    }
    
    #scan-button {
        width: auto;
        align-self: center;
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: 0.95rem;
        min-width: 140px;
    }
    
    .summary-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .summary-grade {
        font-size: 4rem;
        height: 120px;
    }
    
    .raw-headers-table td:first-child {
        width: 150px;
        font-size: 0.75rem;
    }
    
    .raw-headers-table td {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* Security headers table responsive */
    .security-headers-table {
        font-size: 0.875rem;
    }
    
    .security-headers-table th,
    .security-headers-table td {
        padding: var(--spacing-sm);
    }
    
    .header-badge {
        font-size: 0.625rem;
        padding: 2px var(--spacing-xs);
        min-width: 50px;
    }
    
    .header-name {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .raw-headers-table td:first-child {
        width: 120px;
    }
    
    .summary-grade {
        font-size: 3rem;
        height: 100px;
    }
}

@media (max-width: 480px) {
    .main-header h1 {
        font-size: 1.8rem;
    }
    
    .summary-grade {
        font-size: 3rem;
        height: 100px;
    }
    
    .card-header {
        padding: 12px 20px;
        font-size: 1.1rem;
    }
    
    .card-body {
        padding: 15px;
    }
}

/* =================== ABOUT SECTION STYLES =================== */
.about-section {
    padding: var(--spacing-2xl) 0;
}

.about-hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
}

.developer-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-gray-200);
}

.developer-info {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    align-items: flex-start;
}

.developer-avatar {
    flex-shrink: 0;
}

.avatar-placeholder {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.avatar-image {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    box-shadow: var(--shadow-lg);
    border: 4px solid white;
    transition: all 0.3s ease;
}

.avatar-image:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.avatar-initials {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
}

.developer-details {
    flex: 1;
}

.developer-name {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--color-gray-900);
}

.developer-title {
    font-size: 1.2rem;
    color: var(--color-primary);
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
}

.developer-bio {
    line-height: 1.7;
    color: var(--color-gray-600);
    margin: 0;
}

.developer-skills {
    margin-bottom: var(--spacing-2xl);
}

.developer-skills h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-gray-900);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.skill-item:hover {
    background: var(--color-gray-100);
    transform: translateY(-1px);
}

.skill-icon {
    font-size: 1.5rem;
}

.social-links {
    margin-bottom: var(--spacing-2xl);
}

.social-links h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-gray-900);
    text-align: center;
}

.social-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    justify-content: center;
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.social-link.linkedin {
    background: #0077b5;
    color: white;
}

.social-link.linkedin:hover {
    background: #005885;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.social-link.github {
    background: #333;
    color: white;
}

.social-link.github:hover {
    background: #000;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.social-link.twitter {
    background: #1da1f2;
    color: white;
}

.social-link.twitter:hover {
    background: #0d8bd9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.social-link.gmail {
    background: #ea4335;
    color: white;
}

.social-link.gmail:hover {
    background: #d23529;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.social-link.website {
    background: var(--color-primary);
    color: white;
}

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

.social-note {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    font-style: italic;
    margin: 0;
    text-align: center;
}

.project-info h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-gray-900);
}

.project-info p {
    line-height: 1.7;
    color: var(--color-gray-600);
    margin: 0 0 var(--spacing-lg) 0;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-badge {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

/* =================== ABOUT RESPONSIVE STYLES =================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .header-nav {
        justify-content: center;
    }
    
    .developer-info {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
    
    .avatar-placeholder {
        width: 100px;
        height: 100px;
    }
    
    .avatar-image {
        width: 100px;
        height: 100px;
    }
    
    .avatar-initials {
        font-size: 2rem;
    }
    
    .developer-name {
        font-size: 1.75rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .social-buttons {
        justify-content: center;
    }
}