:root {
    --bg-color: #0b0f19;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --card-bg: rgba(30, 41, 59, 0.7);
    --input-bg: rgba(15, 23, 42, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
                      radial-gradient(circle at 85% 30%, rgba(147, 51, 234, 0.15), transparent 25%);
    background-attachment: fixed;
}

header {
    padding: 2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--accent-color);
}

.btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    box-shadow: none;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
    line-height: 1.6;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    width: 100%;
    margin-top: 4rem;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    text-align: left;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Auth Pages (Signup) */
.auth-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 20px;
    width: 100%;
    max-width: 480px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

.auth-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: white;
    padding: 0.875rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.auth-btn {
    width: 100%;
    font-size: 1.1rem;
    padding: 1rem;
    margin-top: 1rem;
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    text-align: center;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Sections */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
}

/* Testimonials */
.testimonials-section {
    margin-top: 8rem;
    width: 100%;
    max-width: 1000px;
}

.testimonials {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 12px;
    text-align: left;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.quote {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.author {
    font-weight: 600;
    color: var(--accent-color);
}

/* CTA Section */
.cta-section {
    margin-top: 8rem;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(147, 51, 234, 0.1));
    padding: 4rem 2rem;
    border-radius: 24px;
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 1000px;
}

.cta-section p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Footer Grid */
.site-footer {
    width: 100%;
    background: rgba(15, 23, 42, 0.8);
    border-top: 1px solid var(--border-color);
    padding: 4rem 5% 2rem;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto 3rem;
    text-align: left;
}

.footer-col h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-col p {
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 300px;
}

.footer-col a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.75rem;
    transition: color 0.2s ease;
}

.footer-col a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}
@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}