/* ============================================
   OTAKIROKU - AUTH PAGES (Login/Signup)
   ============================================ */

/* Auth Page Layout */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 20px 40px;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Header */
.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Form */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    font-size: 0.95rem;
    color: var(--text-primary);
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.form-group input::placeholder {
    color: #9ca3af;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

.form-group input:invalid:not(:placeholder-shown) {
    border-color: var(--error);
}

.form-hint {
    font-size: 0.75rem;
    color: #9ca3af;
}

/* Password Input with Toggle */
.password-input {
    position: relative;
}

.password-input input {
    padding-right: 48px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #9ca3af;
    padding: 4px;
    cursor: pointer;
    transition: color 0.2s;
}

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

.toggle-password svg {
    width: 20px;
    height: 20px;
}

/* Error Message */
.form-error {
    display: none;
    padding: 12px 16px;
    font-size: 0.85rem;
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 10px;
}

/* Submit Button */
.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--primary);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
    margin-top: 8px;
}

.btn-submit:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
}

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

.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Footer */
.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.auth-footer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary);
    font-weight: 600;
    transition: color 0.2s;
}

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

/* Nav Button */
.nav-btn {
    padding: 8px 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s;
}

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

/* Responsive */
@media (max-width: 768px) {
    .auth-page { padding: 80px 16px 32px; }
    .auth-container { padding: 36px 28px; }
}

@media (max-width: 600px) {
    .auth-container { padding: 32px 20px; border-radius: 16px; }
    .auth-header h1 { font-size: 1.5rem; }
    .form-group input { padding: 14px; font-size: 16px; } /* 16px prevents iOS zoom */
    .btn-submit { min-height: 48px; }
    .auth-links { flex-direction: column; gap: 8px; }
}

@media (max-width: 480px) {
    .auth-container {
        padding: 32px 24px;
        border-radius: 20px;
    }

    .auth-header h1 {
        font-size: 1.5rem;
    }
}