:root {
    --primary: #004fff;
    --primary-light: #3366ff;
    --primary-lighter: #e6f0ff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --bg-light: #f8fafc;
    --success: #10b981;
    --success-light: #34d399;
    --success-lighter: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fbbf24;
    --warning-lighter: #fef3c7;
    --danger: #ef4444;
    --danger-light: #f87171;
    --danger-lighter: #fee2e2;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition-default: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Navigation */
.header {
    background: white;
    box-shadow: var(--card-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    box-shadow: 0 4px 8px rgba(0, 79, 255, 0.15);
    transition: var(--transition-bounce);
}

.logo:hover .logo-icon {
    transform: scale(1.05) rotate(-2deg);
}

.logo-text h1 {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0;
}

.logo-text p {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: var(--transition-default);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition-default);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition-bounce);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    gap: 8px;
}

.btn::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.4);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%);
    transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
    animation: ripple 1s ease-out;
}

@keyframes ripple {
    0% { transform: scale(0, 0); opacity: 0.5; }
    20% { transform: scale(25, 25); opacity: 0.3; }
    100% { opacity: 0; transform: scale(40, 40); }
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 4px 10px rgba(0, 79, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 79, 255, 0.3);
    color: white;
}

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary-lighter);
}

.btn-outline:hover {
    background-color: var(--primary-lighter);
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 79, 255, 0.15);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-light) 100%);
    color: white;
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.2);
}

.btn-success:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(16, 185, 129, 0.3);
    color: white;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 24px;
    padding: 4rem 2.5rem;
    margin: 2rem 0 3rem;
    color: white;
    box-shadow: 0 20px 40px rgba(0, 79, 255, 0.2);
    overflow: hidden;
    position: relative;
    transition: var(--transition-default);
}

.page-header:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 79, 255, 0.25);
}

.page-header::before {
    content: "";
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    z-index: 0;
}

.page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.page-title {
    font-weight: 800;
    font-size: 3rem;
    margin-bottom: 1rem;
    letter-spacing: -1px;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-subtitle {
    font-weight: 400;
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 600px;
    line-height: 1.6;
    margin: 0 auto;
}

/* Main Content */
.main-content {
    max-width: 800px;
    margin: 0 auto;
    padding-bottom: 4rem;
}

/* Validation Card */
.validation-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition-bounce);
    margin-bottom: 2rem;
}

.validation-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--card-shadow-hover);
}

.validation-header {
    padding: 2rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-light);
    text-align: center;
}

.validation-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, rgba(0, 79, 255, 0.1) 100%);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
    box-shadow: 0 8px 16px rgba(0, 79, 255, 0.1);
    transition: var(--transition-bounce);
}

.validation-card:hover .validation-icon {
    transform: scale(1.05) rotate(-3deg);
}

.validation-title {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.validation-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.validation-body {
    padding: 2rem;
}

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

.form-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

.form-control {
    width: 100%;
    height: 56px;
    padding: 0 1rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition-default);
    background: white;
    color: var(--text-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 79, 255, 0.1);
}

.form-control::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.form-help {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-help i {
    color: var(--primary);
}

/* Result Cards */
.result-card {
    border-radius: 16px;
    padding: 1.5rem;
    margin-top: 2rem;
    border: 2px solid;
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    opacity: 0.8;
}

.success-card {
    background: var(--success-lighter);
    border-color: var(--success);
    color: var(--success);
}

.success-card::before {
    background: linear-gradient(90deg, var(--success) 0%, var(--success-light) 100%);
}

.error-card {
    background: var(--danger-lighter);
    border-color: var(--danger);
    color: var(--danger);
}

.error-card::before {
    background: linear-gradient(90deg, var(--danger) 0%, var(--danger-light) 100%);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.result-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
    flex-shrink: 0;
}

.success-card .result-icon {
    background: var(--success);
}

.error-card .result-icon {
    background: var(--danger);
}

.result-title {
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0;
}

.result-content {
    margin-left: 64px;
}

.certificate-details {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.detail-item:last-child {
    margin-bottom: 0;
}

.detail-item i {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--success);
    font-size: 0.875rem;
    flex-shrink: 0;
}

.detail-label {
    font-weight: 600;
    min-width: 80px;
}

.detail-value {
    font-weight: 500;
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 280px;
    height: 100%;
    background: white;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.mobile-nav.active .mobile-nav-content {
    transform: translateX(0);
}

.mobile-nav-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

.mobile-nav-links {
    list-style: none;
    margin-top: 3rem;
}

.mobile-nav-links li {
    margin-bottom: 1rem;
}

.mobile-nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.125rem;
}

.mobile-nav-actions {
    margin-top: 2rem;
}

.mobile-nav-actions .btn {
    width: 100%;
    margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links,
    .nav-actions {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .page-header {
        padding: 3rem 1.75rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1.125rem;
    }

    .validation-body {
        padding: 1.5rem;
    }

    .validation-header {
        padding: 1.5rem;
    }

    .result-content {
        margin-left: 0;
        margin-top: 1rem;
    }

    .result-header {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 1.75rem;
    }

    .validation-body,
    .validation-header {
        padding: 1rem;
    }
}