/* Modern Variables */
:root {
    --primary-color: #3457D5;
    --secondary-color: #4834d4;
    --success-color: #00b894;
    --danger-color: #ff7675;
    --text-color: #2d3436;
    --bg-light: #f5f6fa;
    --border-radius: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

/* Modern Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-light);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Modern Hero Section */
.hero-section {
    min-height: 100vh;
    background: #fff;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(52, 87, 213, 0.1) 0%, rgba(52, 87, 213, 0) 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-content {
    max-width: 800px;
    width: 90%;
    padding: 3rem;
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-text {
    font-size: 4.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 2rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

#changing-word {
    position: relative;
    display: inline-block;
    color: var(--primary-color);
    transition: var(--transition);
}

#changing-word::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--secondary-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

#changing-word:hover::after {
    transform: scaleX(1);
}

/* Modern Buttons */
.button-group {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 3rem;
}

.btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.5px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: 0.6s;
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #00cec9);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn:active {
    transform: translateY(1px);
}

.btn i {
    font-size: 1.2rem;
    transition: var(--transition);
}

.btn:hover i {
    transform: translateX(3px);
}

/* Modern Card Design */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: none;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Modern Form Elements */
.form-control {
    padding: 0.8rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-size: 1rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 87, 213, 0.1);
    outline: none;
}

/* Modern Helper Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.bg-gradient {
    background: var(--gradient-primary);
}

.shadow-hover {
    transition: var(--transition);
}

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

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

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Modern Responsive Design */
@media (max-width: 768px) {
    .hero-text {
        font-size: 3rem;
    }
    
    .button-group {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

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

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

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

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

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95) !important;
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    color: var(--text-color) !important;
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-color) !important;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background: rgba(52, 87, 213, 0.1);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, #fff, var(--bg-light));
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(52, 87, 213, 0.1) 0%, transparent 70%);
    transform: rotate(45deg);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #666;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    position: relative;
    padding: 2rem;
}

.hero-image::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius);
    background: linear-gradient(135deg, rgba(52, 87, 213, 0.1), rgba(72, 52, 212, 0.1));
    transform: rotate(-2deg);
}

.hero-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    position: relative;
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: #fff;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.feature-card {
    padding: 2rem;
    background: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-card p {
    color: #666;
    margin: 0;
}

/* Buttons */
.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: #fff;
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 991.98px) {
    .hero {
        padding: 4rem 0;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-image {
        margin-top: 3rem;
    }

    .features {
        padding: 4rem 0;
    }

    .feature-card {
        margin-bottom: 2rem;
    }
}

@media (max-width: 767.98px) {
    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
        margin-bottom: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

/* Toast notifications */
.toast-message {
    position: fixed;
    right: 20px;
    padding: 1rem 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 300px;
    max-width: 400px;
}

.toast-message i {
    font-size: 1.2rem;
}

.toast-success {
    border-left: 4px solid var(--success-color);
}

.toast-success i {
    color: var(--success-color);
}

.toast-error {
    border-left: 4px solid var(--danger-color);
}

.toast-error i {
    color: var(--danger-color);
}

.toast-info {
    border-left: 4px solid var(--primary-color);
}

.toast-info i {
    color: var(--primary-color);
}

/* Code area styles */
.code-area {
    font-family: 'Fira Code', monospace !important;
    font-size: 14px !important;
    line-height: 1.5 !important;
    padding: 1rem !important;
    background: #f8f9fa !important;
    border: 2px solid #e9ecef !important;
    border-radius: var(--border-radius) !important;
    resize: vertical !important;
    min-height: 200px !important;
}

.code-area:focus {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(52, 87, 213, 0.1) !important;
    outline: none !important;
}

/* Test key container */
.test-key-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.test-key-container h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.test-key-container .btn {
    margin: 1rem 0;
    min-width: 200px;
}