/* CSS Custom Properties */
:root {
    /* Light mode colors (default) */
    --bg-primary: #f5f0e6;
    --bg-secondary: #ebe5d9;
    --text-primary: #3d2b1f;
    --text-secondary: #5c4a3d;
    --accent: #8b4049;
    --accent-hover: #6d323a;
    --border-color: #d4cbbe;
    --input-bg: #faf8f4;
    --success: #4a7c59;
    --error: #a63d40;

    /* Typography */
    --font-serif: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
    --font-body: Georgia, 'Times New Roman', serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* Dark mode colors */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #252525;
    --text-primary: #e8e0d5;
    --text-secondary: #b8ada0;
    --accent: #c46b73;
    --accent-hover: #d88990;
    --border-color: #3d3d3d;
    --input-bg: #2a2a2a;
    --success: #6b9c7a;
    --error: #d66b6e;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Header */
.header {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.theme-toggle:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Theme toggle icons */
.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* Main Content */
main {
    flex: 1;
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    width: 100%;
    display: flex;
    align-items: center;
}

/* Hero Section */
.hero {
    text-align: center;
    width: 100%;
    padding: var(--spacing-md) 0;
}

.hero-headline {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero-context {
    font-size: 1rem;
    color: var(--accent);
    margin-bottom: var(--spacing-xs);
    line-height: 1.5;
    font-weight: 700;
}

.hero-context a {
    color: inherit;
    text-decoration: underline;
}

.hero-context a:hover {
    color: var(--accent-hover);
}

.hero-subheadline {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

/* Form Styles */
.waitlist-form {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-row input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-normal);
}

.form-row input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.form-row input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(139, 64, 73, 0.15);
}

[data-theme="dark"] .form-row input:focus {
    box-shadow: 0 0 0 3px rgba(196, 107, 115, 0.2);
}

/* Submit Button */
.submit-btn {
    padding: 0.75rem 1.5rem;
    font-family: var(--font-serif);
    font-size: 0.9375rem;
    font-weight: 700;
    color: #fff;
    background-color: var(--accent);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.submit-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.submit-btn:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.submit-btn:active:not(:disabled) {
    transform: translateY(1px);
}

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

.submit-btn .btn-loading {
    display: none;
}

.submit-btn.loading .btn-text {
    display: none;
}

.submit-btn.loading .btn-loading {
    display: inline;
}

/* Form Message */
.form-message {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: 4px;
    font-size: 0.875rem;
    text-align: center;
    display: none;
}

.form-message.success {
    display: block;
    background-color: rgba(74, 124, 89, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.form-message.error {
    display: block;
    background-color: rgba(166, 61, 64, 0.1);
    color: var(--error);
    border: 1px solid var(--error);
}

/* Feature Hints */
.feature-hints {
    font-size: 0.875rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

/* Footer */
.footer {
    padding: var(--spacing-sm) var(--spacing-md);
    border-top: 1px solid var(--border-color);
    text-align: center;
    background-color: var(--bg-secondary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Desktop Styles (480px+) */
@media (min-width: 480px) {
    .form-row {
        flex-direction: row;
    }

    .submit-btn {
        flex-shrink: 0;
    }
}

/* Desktop Styles (768px+) */
@media (min-width: 768px) {
    .site-title {
        font-size: 1.25rem;
    }

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

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

    .form-row input {
        padding: 0.875rem 1.25rem;
    }

    .submit-btn {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .theme-toggle,
    .waitlist-form {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}