/* ========================================
   Auth Pages — Login & Register
   ========================================
   Shared styles for authentication flow.
   Uses design tokens from global.css.
*/

/* ========== Page Layout ========== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(123, 157, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(99, 102, 241, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(123, 157, 255, 0.04) 0%, transparent 50%),
        var(--color-bg-page);
    padding: var(--space-8) var(--space-4);
}

@media (max-width: 768px) {
    .auth-page {
        align-items: flex-start;
        padding: var(--space-6) var(--space-4);
    }
}

/* ========== Card ========== */
.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-bg-surface);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    box-shadow:
        0 1px 3px rgba(0, 0, 0, 0.04),
        0 6px 24px rgba(0, 0, 0, 0.06);
    padding: var(--space-8);
}

.auth-card.is-wide {
    max-width: 480px;
}

@media (max-width: 768px) {
    .auth-card {
        padding: var(--space-6);
        border-radius: var(--radius-xl);
    }
}

/* ========== Header ========== */
.auth-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

@media (max-width: 768px) {
    .auth-header {
        margin-bottom: var(--space-4);
    }
}

.auth-logo {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-4);
    background: linear-gradient(135deg, var(--color-primary), #6366F1);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.25rem;
    box-shadow: 0 4px 12px var(--color-primary-shadow);
}

.auth-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-1);
    line-height: var(--leading-tight);
}

.auth-subtitle {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: var(--leading-normal);
}

.auth-subtitle a {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

.auth-subtitle a:hover {
    color: var(--color-primary-hover);
}

/* ========== Form Fields ========== */
.auth-field {
    margin-bottom: var(--space-4);
}

@media (max-width: 768px) {
    .auth-field {
        margin-bottom: var(--space-3);
    }
}

.auth-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.auth-input-wrap {
    position: relative;
}

.auth-input-icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    font-size: var(--text-base);
    transition: color var(--transition-base);
    pointer-events: none;
}

/* Highlight icon when input is focused */
.auth-input:focus ~ .auth-input-icon,
.auth-input-wrap:focus-within .auth-input-icon {
    color: var(--color-primary);
}

.auth-input {
    width: 100%;
    height: 2.75rem;
    padding: 0 0.875rem 0 2.5rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    background: var(--color-bg-surface);
    transition: all var(--transition-base);
}

.auth-input::placeholder {
    color: var(--color-text-tertiary);
}

.auth-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.auth-input.has-error {
    border-color: var(--color-danger);
}

.auth-input.has-error:focus {
    box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.1);
}

.auth-input.has-success {
    border-color: var(--color-success);
}

/* ========== Password Toggle ========== */
.auth-pw-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: color var(--transition-base);
    z-index: 2;
}

.auth-pw-toggle:hover {
    color: var(--color-text-secondary);
}

.auth-pw-toggle:focus {
    outline: none;
}

/* ========== Password Strength ========== */
.auth-pw-strength {
    margin-top: var(--space-2);
}

.auth-pw-bar {
    height: 3px;
    background: var(--color-bg-muted);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--space-1);
}

.auth-pw-fill {
    height: 100%;
    width: 0;
    border-radius: 2px;
    transition: all var(--transition-slow);
}

.auth-pw-fill.weak   { width: 33%; background: var(--color-danger); }
.auth-pw-fill.medium { width: 66%; background: var(--color-warning); }
.auth-pw-fill.strong { width: 100%; background: var(--color-success); }

.auth-pw-text {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
}

/* ========== Messages ========== */
.auth-error {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-danger);
}

.auth-success {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-success);
}

/* ========== Checkbox ========== */
.auth-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin: var(--space-4) 0;
}

.auth-checkbox input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    accent-color: var(--color-primary);
}

.auth-checkbox label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
}

/* Terms variant (register page) */
.auth-checkbox.is-terms {
    align-items: flex-start;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-subtle);
    border-radius: var(--radius-lg);
}

.auth-checkbox.is-terms input[type="checkbox"] {
    margin-top: 2px;
    flex-shrink: 0;
}

.auth-checkbox.is-terms label {
    line-height: var(--leading-normal);
}

.auth-checkbox.is-terms a {
    color: var(--color-primary);
    font-weight: 500;
}

/* ========== Submit Button ========== */
.auth-submit {
    width: 100%;
    height: 2.75rem;
    background: var(--color-primary);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.auth-submit:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--color-primary-shadow);
}

.auth-submit:active:not(:disabled) {
    transform: translateY(0);
}

.auth-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ========== Footer Links ========== */
.auth-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-muted);
}

.auth-footer.is-centered {
    justify-content: center;
    text-align: center;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.auth-link {
    font-size: var(--text-sm);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-base);
}

.auth-link:hover {
    color: var(--color-primary-hover);
}

/* ========== Divider ========== */
.auth-divider {
    display: flex;
    align-items: center;
    margin: var(--space-4) 0;
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--color-border);
}

.auth-divider::before { margin-right: var(--space-4); }
.auth-divider::after  { margin-left: var(--space-4); }

/* ========== Social Login ========== */
.auth-social {
    display: flex;
    gap: var(--space-3);
}

.auth-social-btn {
    flex: 1;
    height: 2.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    background: var(--color-bg-subtle);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-size: var(--text-base);
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
}

.auth-social-btn:hover {
    background: var(--color-bg-muted);
    border-color: var(--color-text-tertiary);
    color: var(--color-text-primary);
}

.auth-social-btn i {
    font-size: 1.25rem;
}

@media (max-width: 768px) {
    .auth-social {
        flex-direction: column;
    }
}

/* ========== Welcome (already logged in) ========== */
.auth-welcome {
    text-align: center;
    padding: var(--space-8) var(--space-6);
}

.auth-welcome-icon {
    font-size: 3.5rem;
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.auth-welcome-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: var(--space-2);
}

.auth-welcome-text {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.auth-welcome-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    height: 2.75rem;
    padding: 0 var(--space-8);
    background: var(--color-primary);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: var(--text-base);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
}

.auth-welcome-btn:hover {
    background: var(--color-primary-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--color-primary-shadow);
}