:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --danger: #dc2626;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --bg-page: #f1f5f9;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #eef2ff 0%, #f1f5f9 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.loader {
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 16px auto 0;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.login-box {
    display: none;
    width: 100%;
    max-width: 380px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 28px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.brand {
    font-size: 1.6rem;
    font-weight: 800;
    text-align: center;
    color: var(--primary);
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.brand i {
    margin-right: 8px;
}

.login-box input[type="text"],
.login-box input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.login-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.login-box button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s;
}

.login-box button:hover:not(:disabled) {
    background: var(--primary-dark);
}

.login-box button:disabled {
    opacity: 0.6;
    cursor: default;
}

.error-message {
    display: none;
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 0.85rem;
    margin-bottom: 12px;
    text-align: center;
}

.code-inputs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin: 16px 0;
}

.code-input {
    width: 44px;
    height: 52px;
    text-align: center;
    font-size: 1.4rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-family: inherit;
}

.code-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.login-box h3 {
    color: var(--text-primary);
}

.login-box p {
    color: var(--text-secondary);
}

.link {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--primary);
    text-decoration: none;
    cursor: pointer;
}

.link:hover {
    text-decoration: underline;
}