/* Design Tokens — Stripe-inspired */
:root {
    --color-primary: #635bff;
    --color-primary-hover: #5851ea;
    --color-primary-light: rgba(99, 91, 255, 0.1);

    --color-green: #2e7d32;
    --color-orange: #ef6c00;
    --color-teal: #009688;

    --color-text: #1a1f36;
    --color-text-secondary: #697386;
    --color-text-muted: #8792a2;

    --color-bg: #f6f9fc;
    --color-surface: #fff;
    --color-border: #e3e8ee;
    --color-border-light: #f0f3f7;

    --color-error: #cd3d64;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
}

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

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

/* Common form elements */
input[type="number"],
input[type="text"],
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    color: var(--color-text);
    transition: border-color 0.15s ease;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* Common button */
.btn-primary {
    width: 100%;
    padding: 12px;
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

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

/* Loading spinner */
.spinner {
    border: 3px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

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