/* WhatsApp Embedded Signup Page Styles */

/* =====================
   CSS Custom Properties
   ===================== */
:root {
    /* Color palette */
    --color-primary: #075e54;
    --color-primary-hover: #064940;
    --color-error: #b71c1c;
    --color-text: #333333;
    --color-text-subtle: #666666;
    --color-background: #f5f5f5;
    --color-card: #ffffff;
    --color-border: #e0e0e0;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-card: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.5;
    min-height: 100vh;
}

/* =====================
   Container Layout
   ===================== */
.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--spacing-md);
}

/* =====================
   Card Component
   ===================== */
.card {
    background-color: var(--color-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-xl) var(--spacing-lg);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

/* =====================
   Logo
   ===================== */
.logo {
    margin-bottom: var(--spacing-md);
}

.logo svg {
    display: block;
    margin: 0 auto;
}

/* =====================
   Typography
   ===================== */
h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    font-size: 0.9375rem;
    color: var(--color-text-subtle);
    margin-bottom: var(--spacing-lg);
}

.help-text {
    font-size: 0.8125rem;
    color: var(--color-text-subtle);
    margin-top: var(--spacing-sm);
}

/* =====================
   State Management
   ===================== */
.state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    transition: opacity var(--transition-normal);
}

.state.hidden {
    display: none;
}

.state p {
    font-size: 0.9375rem;
    color: var(--color-text-subtle);
}

/* =====================
   Loading Spinner
   ===================== */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Screen reader only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* =====================
   Button Styles
   ===================== */
button {
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                transform var(--transition-fast);
}

button:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:active {
    transform: scale(0.98);
}

/* Primary Button (WhatsApp green) */
.primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
}

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

.primary-btn:focus {
    outline-color: var(--color-primary-hover);
}

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

/* Secondary Button (Outlined) */
.secondary-btn {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    padding: calc(var(--spacing-sm) - 2px) calc(var(--spacing-md) - 2px);
}

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

/* =====================
   Error State
   ===================== */
.error-icon {
    margin-bottom: var(--spacing-xs);
    color: var(--color-error);
}

.error-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.error-text {
    color: var(--color-error);
    font-weight: 500;
}

/* =====================
   Footer
   ===================== */
.footer {
    margin-top: var(--spacing-lg);
    text-align: center;
}

.footer p {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
}

/* =====================
   Responsive Design
   ===================== */
@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    .card {
        padding: var(--spacing-lg) var(--spacing-md);
        border-radius: var(--radius-md);
    }

    h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.875rem;
    }

    .primary-btn {
        padding: var(--spacing-sm);
        font-size: 0.9375rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text: #000000;
        --color-text-subtle: #333333;
        --shadow-card: 0 0 0 2px #000000;
    }

    button:focus {
        outline-width: 3px;
    }
}

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