/* 夏日留言板 v3 - 身份引导层 */
/* ==================== 身份引导ĺą?==================== */
.onboarding {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg-primary);
    transition: opacity 0.5s ease, visibility 0.5s ease, transform 0.5s cubic-bezier(0.32, 0.72, 0, 1);
}

.onboarding.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    pointer-events: none;
}

.onboarding-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.onboarding-bg .bg-blob {
    filter: blur(90px);
    opacity: 0.5;
}

.onboarding .petals-container {
    z-index: 1;
}

.onboarding-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 400px;
    padding: 24px;
    text-align: center;
    animation: onboardingIn 0.7s cubic-bezier(0.32, 0.72, 0, 1);
}

@keyframes onboardingIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.onboarding-icon {
    font-size: 64px;
    margin-bottom: 16px;
    animation: iconFloat 3s ease-in-out infinite;
    filter: drop-shadow(0 8px 20px rgba(255, 138, 101, 0.3));
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.onboarding-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.onboarding-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 500;
}

.identity-cards {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 28px;
}

.identity-card {
    position: relative;
    width: 100%;
    padding: 28px 20px;
    border: none;
    border-radius: var(--radius-xl);
    background: var(--bg-card);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-card);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
    overflow: hidden;
}

.identity-card:active {
    transform: scale(0.96);
}

.identity-card.mdb {
    border: 2px solid rgba(77, 208, 225, 0.35);
}

.identity-card.fjd {
    border: 2px solid rgba(255, 138, 101, 0.4);
}

.identity-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(77, 208, 225, 0.12), transparent 50%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.identity-card.fjd .identity-glow {
    background: radial-gradient(circle at 50% 50%, rgba(255, 138, 101, 0.15), transparent 50%);
}

.identity-card:hover .identity-glow,
.identity-card:focus .identity-glow {
    opacity: 1;
}

.identity-icon {
    font-size: 44px;
    margin-bottom: 4px;
    transition: transform 0.3s ease;
}

.identity-card:hover .identity-icon,
.identity-card:focus .identity-icon {
    transform: scale(1.1);
}

.identity-name {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.identity-desc {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
}

.onboarding-hint {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* 身份卡片选择后的消失动画 */
.onboarding.exiting .onboarding-content {
    animation: onboardingOut 0.4s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

@keyframes onboardingOut {
    to {
        opacity: 0;
        transform: scale(1.05);
    }
}

/* PC 端引导层并排卡片 */
@media (min-width: 768px) {
    .identity-cards {
        flex-direction: row;
        gap: 20px;
    }
    
    .identity-card {
        flex: 1;
        padding: 36px 20px;
    }
    
    .onboarding-title {
        font-size: 36px;
    }
}