:root {
    --bg-color: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --primary-color: #000000;
    --primary-hover: #333333;
    --error-color: #ef4444;
    --success-color: #10b981;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.main-container {
    width: 100%;
    max-width: 440px;
    padding: 1.5rem;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 100%;
    justify-content: space-between;
}

/* Header */
.auth-header {
    width: 100%;
    text-align: center;
    margin-top: 1rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    height: 40px;
    width: auto;
    margin-bottom: 0.75rem;
}

.company-name {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* Content */
.auth-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 2rem 0;
}

.intro-text {
    margin-bottom: 2rem;
    text-align: center;
}

.intro-text h1 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
}

.intro-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Steps */
.step {
    display: none;
    flex-direction: column;
    gap: 1.5rem;
    animation: fadeIn 0.3s ease-in-out;
}

.step.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.sub-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}

.phone-input-wrapper, .input-wrapper {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.2s;
    padding-bottom: 0.5rem;
}

.phone-input-wrapper:focus-within, .input-wrapper:focus-within {
    border-bottom: 1px solid var(--primary-color);
}

.country-code {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-right: 1rem;
    user-select: none;
}

input {
    border: none;
    background: transparent;
    font-size: 1.25rem;
    color: var(--text-primary);
    width: 100%;
    outline: none;
    padding: 0;
    font-family: var(--font-family);
}

input::placeholder {
    color: #d1d5db;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s;
    border-radius: 0;
    margin-top: 1rem;
}

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

.btn-primary:disabled {
    background-color: var(--text-secondary);
    cursor: not-allowed;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: underline;
    margin-top: 0.5rem;
    padding: 0.5rem;
}

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

/* Footer */
.auth-footer {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.auth-footer a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
}

.auth-footer .copyright {
    margin-top: 0.75rem;
    font-size: 0.7rem;
    color: #9ca3af;
}

/* Messages */
#message-box {
    margin-top: 1.5rem;
    padding: 0.75rem;
    font-size: 0.875rem;
    text-align: center;
    border-radius: 4px;
}

.error {
    color: var(--error-color);
    background-color: #fef2f2;
}

.success {
    color: var(--success-color);
    background-color: #ecfdf5;
}

.hidden {
    display: none;
}