/* modern-style.css */
:root {
    --primary-color: #4338ca;
    --primary-dark: #3730a3;
    --primary-light: #6366f1;
    --secondary-color: #f8fafc;
    --accent-color: #06b6d4;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 20px 60px rgba(0, 0, 0, 0.15);
    --shadow-strong: 0 30px 80px rgba(0, 0, 0, 0.2);
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 24px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--gradient-bg);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    color: var(--text-dark);
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--gradient-bg);
}

.bg-animation::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 25% 25%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 75% 75%, rgba(255,255,255,0.05) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

.bg-animation::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    animation: drift 30s linear infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

@keyframes drift {
    0% { transform: translateX(0); }
    100% { transform: translateX(-60px); }
}

/* Navigation */
.navbar {
    backdrop-filter: blur(20px);
    background: var(--glass-bg) !important;
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: white !important;
    text-decoration: none;
    transition: all 0.3s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.navbar-brand .text-accent {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-toggler {
    border: none;
    color: white;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: white !important;
    background: var(--glass-bg);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    padding: 140px 0 80px;
    text-align: center;
    position: relative;
}

.hero-title {
    font-weight: 800;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    color: white;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.text-gradient {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.btn-hero {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-transform: none;
    letter-spacing: 0.025em;
    border: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-width: 160px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-hero::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 0.5s;
}

.btn-hero:hover::before {
    left: 100%;
}

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

.btn-primary-hero:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
    color: var(--primary-dark);
}

.btn-outline-hero {
    background: var(--glass-bg);
    color: white;
    border: 2px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-outline-hero:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
    color: white;
}

/* Demo Container */
.demo-container {
    max-width: 800px;
    margin: 0 auto 4rem;
}

.demo-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    box-shadow: var(--shadow-soft);
    animation: slideUp 1s ease-out 0.5s both;
}

.demo-input, .demo-output {
    flex: 1;
    padding: 1rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.demo-input {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.demo-output {
    background: rgba(6, 182, 212, 0.2);
    color: var(--accent-color);
    font-weight: 600;
}

.demo-arrow {
    color: white;
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
}

.section-title {
    font-weight: 800;
    font-size: clamp(2rem, 4vw, 3rem);
    color: white;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 3rem;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    height: 100%;
    box-shadow: var(--shadow-soft);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
    background: rgba(255, 255, 255, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
    box-shadow: var(--shadow-soft);
}

.feature-card h4 {
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.feature-card p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* Modal Styles */
.modern-modal {
    border: none;
    border-radius: var(--border-radius-lg);
    background: white;
    box-shadow: var(--shadow-strong);
    backdrop-filter: blur(20px);
    overflow: hidden;
}

.modal-header {
    border: none;
    padding: 2rem 2rem 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.modal-title {
    font-weight: 700;
    font-size: 1.5rem;
    margin: 0;
}

.btn-close {
    filter: invert(1);
    opacity: 0.8;
}

.btn-close:hover {
    opacity: 1;
}

.modal-body {
    padding: 2rem;
}

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

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

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    z-index: 3;
}

.modern-input {
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f8fafc;
}

.modern-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 56, 202, 0.1);
    background: white;
}

.btn-primary-modern {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
}

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

.text-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.alert-modern {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-top: 1rem;
    border: none;
    font-weight: 500;
}

.alert-modern.alert-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.alert-modern.alert-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.3rem;
    }
    
    .hero-section {
        padding: 120px 0 60px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-hero {
        width: 100%;
        max-width: 280px;
    }
    
    .demo-card {
        flex-direction: column;
        padding: 1.5rem;
        text-align: center;
    }
    
    .demo-arrow {
        transform: rotate(90deg);
        margin: 1rem 0;
    }
    
    .demo-input span, .demo-output span {
        font-size: 0.8rem;
        word-break: break-all;
    }
    
    .features-section {
        padding: 60px 0;
    }
    
    .feature-card {
        margin-bottom: 2rem;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
    
    .modal-header {
        padding: 1.5rem 1.5rem 1rem;
    }
}

@media (max-width: 576px) {
    .demo-input, .demo-output {
        padding: 0.75rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}