:root {
    /* Brand Colors - Cool greens and clinical blues */
    --primary-green: #4A9E81;
    --primary-green-dark: #2E7D6B;
    --primary-blue: #5B9BD5;
    --primary-blue-dark: #4472C4;
    --background: #FFFFFF;
    --background-subtle: #F8FCFA;
    --text-primary: #1A1A1A;
    --text-secondary: #4A5568;
    --border: #E2E8F0;
    --border-subtle: #F1F5F9;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
.header {
    margin-bottom: 4rem;
}

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

.logo-icon {
    width: 60px;
    height: 60px;
    animation: pulse-subtle 3s ease-in-out infinite;
}

@keyframes pulse-subtle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.logo svg {
    width: 100%;
    height: 100%;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

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

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 5rem;
    padding: 2rem 0;
}

.coming-soon-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 50px;
    margin-bottom: 2rem;
    animation: fade-in 1s ease-in;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2rem;
    padding: 0.875rem 1.5rem;
    background: transparent;
    color: var(--primary-green);
    text-decoration: none;
    border: 2px solid var(--primary-green);
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    animation: fade-in 1s ease-in 0.2s both;
}

.hero-cta svg {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.hero-cta:hover {
    transform: translateY(-2px);
    background: var(--primary-green);
    color: white;
    box-shadow: 0 8px 20px rgba(74, 158, 129, 0.3);
}

.hero-cta:hover svg {
    transform: translateX(4px);
}

/* Content Sections */
.content {
    margin-bottom: 4rem;
}

.section {
    margin-bottom: 4rem;
}

.section h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.concept-box {
    background: var(--background-subtle);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2.5rem;
}

.lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.meaning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.meaning-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.meaning-badge {
    font-size: 0.875rem;
    color: var(--primary-green);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.meaning-item span {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.positioning {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

/* 2x2 grid layout on larger screens */
@media (min-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* First 4 cards in 2x2 grid, then last card spans full width */
    .feature-card:nth-child(5) {
        grid-column: 1 / -1;
        max-width: 50%;
        margin: 0 auto;
    }
}

.feature-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary-green);
    box-shadow: 0 8px 24px rgba(74, 158, 129, 0.1);
    transform: translateY(-2px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    color: var(--primary-green);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Audience List */
.audience-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

/* 4x1 row layout for audience items on larger screens */
@media (min-width: 900px) {
    .audience-list {
        grid-template-columns: repeat(4, 1fr);
    }
}

.audience-item {
    background: var(--background-subtle);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.audience-item svg {
    width: 20px;
    height: 20px;
    color: var(--primary-green);
    flex-shrink: 0;
}

.audience-item:hover {
    border-color: var(--primary-green);
    background: white;
}

/* Signup Section */
.signup-section {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    border-radius: 20px;
    padding: 3rem 2.5rem;
    text-align: center;
    color: white;
}

.signup-section h3 {
    color: white;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.signup-description {
    font-size: 1.125rem;
    opacity: 0.95;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.signup-form {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto 1rem;
}

.email-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: all 0.3s ease;
}

.email-input:focus {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.submit-btn {
    padding: 1rem 2rem;
    background: white;
    color: var(--primary-green);
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.submit-btn.success {
    background: #4A9E81 !important;
    color: white !important;
    cursor: default;
    pointer-events: none;
    animation: success-pulse 0.6s ease-in-out;
}

.submit-btn.success:hover {
    transform: none;
    box-shadow: none;
}

@keyframes success-pulse {
    0% { 
        transform: scale(1);
    }
    50% { 
        transform: scale(1.05);
    }
    100% { 
        transform: scale(1);
    }
}

.form-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

.footer p {
    margin-bottom: 0.5rem;
}

.footer-small {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .logo h1 {
        font-size: 2rem;
    }

    .logo-icon {
        width: 50px;
        height: 50px;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .concept-box {
        padding: 1.5rem;
    }

    .lead {
        font-size: 1.125rem;
    }

    .signup-section {
        padding: 2rem 1.5rem;
    }

    .signup-form {
        flex-direction: column;
    }

    .submit-btn {
        width: 100%;
    }

    .features-grid,
    .audience-list {
        grid-template-columns: 1fr;
    }
}

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

    .section h3 {
        font-size: 1.5rem;
    }
}