/* ========================================
   HeartBased.ai Landing Page Styles
   Professional color palette with strategic focus
   ======================================== */

:root {
    /* Color Palette */
    --pink-primary: #FF64A6;
    --pink-hover: #FF7AB5;
    --pink-dark: #DE4083;
    --teal-light: #03BFAE;
    --teal-dark: #009688;

    /* Backgrounds */
    --bg-dark-start: #0D1117;
    --bg-dark-end: #1A1F24;

    /* Text */
    --text-primary: #F5F5F5;
    --text-secondary: #A0A0A0;
    --text-muted: #6B6B6B;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, var(--bg-dark-start) 0%, var(--bg-dark-end) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Layout
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* ========================================
   Logo/Wordmark
   ======================================== */

.logo {
    padding: var(--spacing-md) 0;
    text-align: center;
}

.logo h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.ai-accent {
    color: var(--teal-light);
    position: relative;
}

.ai-accent::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--teal-light), var(--teal-dark));
    opacity: 0.6;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    max-width: 650px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
}

.headline {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--teal-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subheadline {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

.tagline {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-md);
    font-style: italic;
}

/* ========================================
   Email Form
   ======================================== */

.email-form {
    width: 100%;
    max-width: 500px;
}

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-group input[type="email"] {
    flex: 1;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    font-family: var(--font-primary);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    outline: none;
    transition: all var(--transition-medium);
}

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

.form-group input[type="email"]:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--teal-light);
    box-shadow: 0 0 0 3px rgba(3, 191, 174, 0.1);
}

.cta-button {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-primary);
    color: #FFFFFF;
    background: var(--pink-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-medium);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--pink-primary), var(--pink-dark));
    opacity: 0;
    transition: opacity var(--transition-medium);
    z-index: 0;
}

.cta-button:hover::before {
    opacity: 1;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 100, 166, 0.3);
}

.cta-button:active {
    transform: translateY(0);
}

.cta-button .button-text,
.cta-button .button-loader {
    position: relative;
    z-index: 1;
}

/* Loading spinner */
.spinner {
    animation: rotate 2s linear infinite;
    width: 20px;
    height: 20px;
    display: inline-block;
}

.spinner .path {
    stroke: #FFFFFF;
    stroke-linecap: round;
    animation: dash 1.5s ease-in-out infinite;
}

@keyframes rotate {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes dash {
    0% {
        stroke-dasharray: 1, 150;
        stroke-dashoffset: 0;
    }
    50% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -35;
    }
    100% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -124;
    }
}

/* Form messages */
.form-message {
    font-size: 0.9rem;
    text-align: center;
    min-height: 1.5rem;
}

.form-message.success {
    color: var(--teal-light);
}

.form-message.error {
    color: var(--pink-primary);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    padding: var(--spacing-md) 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.attribution {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.attribution a {
    color: var(--teal-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.attribution a:hover {
    color: var(--teal-dark);
    text-decoration: underline;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }

    .hero {
        padding: var(--spacing-md) 0;
    }

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

    .cta-button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.5rem;
    }

    .headline {
        font-size: 1.75rem;
    }

    .subheadline {
        font-size: 1.1rem;
    }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--teal-light);
    outline-offset: 2px;
}