/* SpeakGoat - Premium Minimal Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* Clean Color Palette */
:root {
    --navy: #1a202c;
    --navy-light: #2d3748;
    --navy-lighter: #4a5568;
    --blue: #3182ce;
    --blue-light: #63b3ed;
    --white: #ffffff;
    --grey-50: #f7fafc;
    --grey-100: #edf2f7;
    --grey-200: #e2e8f0;
    --grey-300: #cbd5e0;
    --grey-400: #a0aec0;
    --grey-500: #718096;
    --grey-600: #4a5568;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

/* Global Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--navy);
    color: var(--white);
    line-height: 1.6;
    font-weight: 400;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

/* Layout Components */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 60px 24px;
}

.card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 48px;
    backdrop-filter: blur(20px);
}

/* Form Elements */
.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--grey-200);
    font-size: 14px;
}

.input {
    width: 100%;
    padding: 16px 20px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--white);
    font-size: 16px;
    font-weight: 400;
    transition: all 0.2s ease;
}

.input:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 4px rgba(49, 130, 206, 0.1);
}

.input::placeholder {
    color: var(--grey-400);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    font-weight: 500;
    font-size: 16px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 52px;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--blue-light);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--glass);
    color: var(--white);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-full {
    width: 100%;
}

/* Pricing Display */
.price-display {
    text-align: center;
    margin: 32px 0;
}

.price-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--blue);
    line-height: 1;
}

.price-period {
    font-size: 18px;
    color: var(--grey-300);
    margin-left: 8px;
    font-weight: 400;
}

/* Feature Lists */
.feature-list {
    list-style: none;
    margin: 32px 0;
}

.feature-list li {
    padding: 12px 0;
    color: var(--grey-200);
    border-bottom: 1px solid var(--glass-border);
    position: relative;
    padding-left: 24px;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--blue);
    font-weight: 600;
}

/* Error States */
.error-message {
    color: #f56565;
    font-size: 14px;
    margin-top: 8px;
    min-height: 20px;
}

/* Loading States */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none;
}

/* Links */
a {
    color: var(--blue);
    text-decoration: none;
}

a:hover {
    color: var(--blue-light);
}

/* Spacing Utilities */
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }

.text-center { text-align: center; }
.text-sm { font-size: 14px; }
.text-xs { font-size: 12px; }

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 32px 16px;
    }
    
    .card {
        padding: 32px 24px;
    }
    
    .price-amount {
        font-size: 40px;
    }
}