/* ===== CSS Variables ===== */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;

    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-inverse: #ffffff;

    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-bg-dark: #111827;

    --color-success: #10b981;
    --color-error: #ef4444;

    --color-border: #e5e7eb;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    --transition: 150ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (min-width: 768px) {
    .hero-content {
        grid-template-columns: 1.2fr 1fr;
    }
}

.hero-text h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.hero-text .highlight {
    color: var(--color-primary);
}

.hero-text .subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.hero-text .description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 480px;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.harry-mascot {
    width: 100%;
    max-width: 350px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ===== Form Styles ===== */
.signup-form {
    max-width: 440px;
}

.form-group {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.form-group input[type="email"] {
    flex: 1;
    min-width: 200px;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input[type="email"]:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input[type="email"]::placeholder {
    color: var(--color-text-light);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--color-text-inverse);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-loading .spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

.btn-loading .spinner circle {
    stroke-dasharray: 50;
    stroke-dashoffset: 20;
}

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

.form-note {
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ===== Success/Error Messages ===== */
.success-message {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    border-radius: var(--radius-lg);
    max-width: 400px;
}

.success-message .success-harry {
    width: 100px;
    margin: 0 auto var(--spacing-sm);
}

.success-message h3 {
    color: var(--color-success);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.success-message p {
    color: var(--color-text-light);
}

.error-message {
    padding: var(--spacing-sm);
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    color: var(--color-error);
    margin-top: var(--spacing-sm);
}

/* ===== Features Section ===== */
.features {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature {
    text-align: center;
    padding: var(--spacing-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
}

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

.feature h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.feature p {
    color: var(--color-text-light);
}

/* ===== Social Proof Section ===== */
.proof {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-alt);
}

.testimonial {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.testimonial p {
    font-size: 1.375rem;
    font-style: italic;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.testimonial cite {
    font-size: 1rem;
    font-style: normal;
    font-weight: 500;
    color: var(--color-text-light);
}

/* ===== CTA Section ===== */
.cta {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    background: var(--color-bg);
}

.cta h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Footer ===== */
footer {
    padding: var(--spacing-lg) 0;
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    text-align: center;
}

footer p {
    font-size: 0.875rem;
}

/* ===== Utility ===== */
[hidden] {
    display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 767px) {
    .hero {
        padding-top: var(--spacing-lg);
    }

    .hero-content {
        text-align: center;
    }

    .hero-text .description {
        margin-left: auto;
        margin-right: auto;
    }

    .signup-form {
        margin: 0 auto;
    }

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

    .form-group input[type="email"],
    .btn-primary {
        width: 100%;
    }

    .success-message {
        margin: 0 auto;
    }

    .harry-mascot {
        max-width: 250px;
    }
}